How to Choose PVD Coated Stainless Steel?

29, Jul. 2024

 

Select the Perfect PVD-Colored Stainless Steel Sheets for ...

In this thorough tutorial, we'll go over important subjects like the PVD process, the colors and surface treatments of PVD-colored stainless steel sheets, and the factors affecting the choice of stainless steel grades. To help achieve the best possible outcomes for your projects, we'll also offer helpful advice for using these items.

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Understanding PVD (Physical Vapor Deposition) Process

PVD, or Physical Vapor Deposition, is a process that strengthens materials such as stainless steel by layering them with an ultra-thin but incredibly durable film. This is done by vaporizing the material and then depositing it onto a substrate.

The PVD process involves the following main steps:

Preparation of the Substrate

Initially, a polished or brushed stainless steel sheet is meticulously cleaned to eliminate any dirt or contaminants.

Loading the Substrate

The substrate is placed into a vacuum chamber manually.

PVD Chamber

Evaporation of the Target Material

Utilizing a high-energy source like an electron beam, the target material such as titanium, zirconium, or chromium is heated until it evaporates.

Titanium Material

Gas injected

To achieve the desired hue of coating, gases such as nitrogen or oxygen are injected into the chamber. This reaction with the metal oxide creates a thin layer that offers various colors.

Activation

Applying an electrical current to the material being coated activates its surface, significantly improving the adherence of the coating film.

Deposition

The vaporized material is then adhered to the substrate, forming a secure and resilient bonding layer.

Color Options

Types of PVD-colored Stainless Steel Sheets

Designers and architects can create one-of-a-kind projects with PVD-colored stainless steel sheets, which provide a stunning array of colors and finishes. In this section, let's explore the range of colors achievable as well as popular surface treatments.

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A. Common Surface Finishes

To ensure that the color coating adheres best to the stainless steel sheets, we always start with polishing or brushing them before proceeding with PVD. This makes the dirt won't be easily hidden and also ensures an even application of color.

  • Mirror: A highly reflective, polished surface is achieved through a series of polishing and buffing processes. This finish adds a sense of luxury and brightness to any project and is especially suited for applications where a bold, high-gloss appearance is desired.
  • Satin: It is created by grinding with belt sanders that range from No. 180 to 320 grit, creating a unidirectional texture and low shine reflectivity.
  • Hairline: Similar to the satin finish, a hairline finish features finer parallel lines and a more delicate appearance, including straight, diagonal, and cross hairline.
  • Vibration: An irregular surface with wavy or random lines created by a mechanical process utilizing high-speed oscillations of abrasive material, such as pads and brushes.
  • Sandblasting: Through the use of high-powered air, sandblasting efficiently eliminates surface contaminants to produce a matte finish. The sandblasted finish is ideal for high-traffic areas or applications where a non-reflective surface is preferred.
  • Patterned: Patterned/textured finishes are extremely popular, and often include embossing, stamping, or etching ' like water ripple, linen, diamond, leather sand fabric 5wl 6wl, and square. After the PVD color coating is done, stamping can be performed. And etching may occur before or after the coloring.
  • Anti-fingerprint(AFP): To ensure that your colored sheets are suitable for use in high-traffic areas, such as elevator panels, wall panels, decorative panels, etc., we recommend investing your budget into anti-fingerprint treatments after the color plating process. This will make sure that your project is not compromised by fingerprints or other smudges!

B. Colors

PVD coating is available in various colors, including gold, rose gold, champagne, black, bronze, blue, green, purple, or even rainbow. Each color can be used to create a unique look that suits your style.

When you're looking for that luxurious feel, gold is a wonderful option. For those seeking something more homey and inviting, rose gold or bronze may be a perfect choice. Black PVD coating helps to bring out your design's sharp lines while rainbow coatings make an outstanding statement with their one-of-a-kind multi-color finish!

Whichever hue catches your eye, rest assured that you'll receive a product of superior quality with long-lasting durability.

Understanding the Benefits of PVD Colored Stainless Steel Sheets

1. Enhanced Aesthetics

It provides a more durable and vibrant finish than traditional paint or coatings. This makes it ideal for applications requiring an attractive, long-lasting aesthetic with minimal maintenance.

2. Improved Durability

Their impressive resistance to corrosion, wear, and tear, and high heat capacity makes them the perfect choice for extreme settings where top-notch performance is required.

3. Low Maintenance

AFP-colored stainless steel sheets look and perform superbly with very little maintenance required. The protective coating makes it unnecessary to clean or polish your sheet often, allowing you to save both energy and money in the long run.

PVD Black Brushed Table

4. Environmentally Friendly

In stark contrast to traditional coating techniques such as electroplating that utilize hazardous chemicals and contribute to environmental pollution, PVD is a vacuum-based process with zero toxic emissions or waste.

Selecting the Right Grade of Stainless Steel

A. The diverse properties of stainless steel, such as its corrosion resistance, strength, and formability differentiate it from other grades.

Some common grade types are:

  • 200 series: characterized by lower nickel content and higher manganese content, offering good formability at low cost but reduced corrosion resistance
  • 300 series: known for excellent corrosion resistance, weldability, and formability, with 304 and 316 being popular choices
  • 400 series: featuring higher carbon content and magnetic properties, offering good heat resistance and strength but lower corrosion resistance

B. Factors to consider when choosing a stainless steel grade for PVD coloring:

1. Corrosion resistance: Carefully evaluating the environment and application, 304/316 stainless steel is highly recommended for its corrosion resistance if used outdoors. Consider the level of endurance needed to meet your project requirements.

2. Formability: If your project necessitates forming, you must be mindful to choose the right type of stainless steel. 200 series should not be utilized if it needs any kind of bending less than 90 degrees.

3. Maximize Your Budget: Take the time to compare prices between different grades that are suitable for your project, and choose the one that is most cost-efficient. Grade 201 is the cheapest while 316/316L has the highest cost.

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V. Applications of PVD-colored Stainless Steel Sheets

A. Interior design

  1. Wall cladding: Transform your walls with the stunning and resilient aesthetic of PVD-colored stainless steel sheets.
  2. Elevator panels: enhance elevator interiors with eye-catching colored stainless steel panels
  3. Kitchen appliances: add a touch of luxury and sophistication to kitchen appliances
  4. Decorative art: use colored stainless steel sheets to create stunning artwork and sculptures
Brushed Black Niche Water Ripple Wall Decor Patterned Wall Cladding

B. Architectural Features:

1. Building facades: building facades can be upgraded to an unparalleled level of both beauty and strength. This unique material is perfect for exterior building cladding and adds a distinct flair that will last for years.

2. Roofing: for stunning, long-lasting roofing solutions, consider PVD-colored stainless steel sheets ' you won't be disappointed.

3. Doors and window frames: incorporate PVD-colored stainless steel sheets for doors and windows to bring a stylish, modern feel to your space.

Water Ripple Facade Patterned Ceiling Gold Frame

C. Signage and Branding:

Add vibrancy and texture to your signage with PVD-colored stainless steel sheets. Highly durable and visually appealing, this material can create a lasting impression for any establishment.

D. Consumer products

Electronic devices: give gadgets and devices a premium look

Jewelry and watches: create stunning, scratch-resistant jewelry and timepieces

Sporting goods: add durability and style to sporting equipment

Factors to Consider Before Purchasing

1. Specification

Ensure that your project's sheet size and thickness adhere to the applicable specifications for ultimate results. For instance, if you require colored sheets for decorative purposes, then a 0.5-1.0mm thickness range is recommended since it can help cut costs!

2. Aesthetics

Choose a color or design that will perfectly match the overall aesthetic of your project. If you want something more modern, think about vibrant colors such as violet and green.

3. Quality Matters

To guarantee the best quality in your PVD-colored stainless steel sheets, purchase from a reliable supplier. It's wise to request samples so that you can review them prior to buying in larger quantities.

Sample Match QC Control Thickness checking

Tips for Working with PVD-colored Stainless Steel Sheets

A. Handling and storage

  • Wear gloves: To avoid leaving fingerprints, smudges, and possible scratches on the sheets, avoid touching them with your bare hands.
  • Lift with care: To prevent bending or damaging the edges, lift and transport the sheets with caution. If required, use the proper equipment.
  • Protective film: To reduce the risk of surface damage, keep the factory protective film on the sheets while storing and handling them.
  • Clean storage location: Keep the sheets away from moisture, dust, and corrosive materials in a place that is clean, dry, and well-ventilated.

B. Cutting and fabrication

  • Use appropriate tools: Employ suitable cutting equipment, such as laser, or waterjet cutting systems, to minimize damage to the PVD coating.
  • Protective film: Keep the protective film in place during fabrication to shield the PVD coating from damage. If you need to do laser cut, then be sure to choose the protective film suitable for laser cutting.
  • Minimize heat: Use coolants or other heat reduction methods, particularly during welding or grinding, to protect the coating. If your project requires welded stainless steel sheets, we recommend not ordering the colored sheets, as the high temperature will easily cause discoloration of the sheet surface.
  • Take precautionary care: Be gentle when handling the sheets during fabrication to prevent scratches or dents.
PVC Film Laser Film

C. Installation and fastening

  • Be sure that the sheets are securely fastened by using appropriate installation techniques, such as adhesive bonding and mechanical fastening.
  • Use the proper fasteners, such as stainless steel threaded rods and nuts or self-tapping screws, to reduce scratching of the PVD coating.
Vigorss Water Ripple Ceiling Panel Installation Manual

D. Cleaning and maintenance

  • To protect the surface from scratches, make sure to utilize non-abrasive cleaning products and soft cloths.
  • For a consistent look, wipe the surface in its finished direction.
  • Avoid using harsh chemicals or abrasive materials that could damage the PVD coating

PVD-colored stainless steel sheet manufacturer

Vigorss, a leading and trustworthy producer of PVD-colored stainless steel sheets, has built a strong reputation for providing customers all over the world with products of outstanding quality. We are a China-based B2B company taking pride in upholding particular quality control and continually discovering clients' hidden demands. 

Vigorss Workshop

You may make spectacular, long-lasting effects in your architectural and interior design projects with our wide range of products in a variety of colors and finishes.

Businesses looking for the best PVD-colored stainless steel sheets can turn to us as a reliable partner in a market where product quality and client satisfaction are top priorities. Vigorss is the right choice for great products and unmatched customer service because of its constant commitment to quality.

Conclusion

PVD-colored stainless steel sheets are a fantastic option for a variety of applications because they offer a distinctive blend of aesthetics, durability, and versatility. You can guarantee a good outcome that will withstand the test of time by comprehending the PVD process, picking the proper grade of stainless steel, selecting the right color, and choosing the perfect surface finish. With the information you've gained from this comprehensive guide, you can choose PVD-colored stainless steel sheets with confidence, enabling you to develop products that are gorgeous, durable, and practical.

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FAQs

1.Can PVD colored stainless steel sheets be used for outdoor applications?

Yes, PVD colored stainless steel sheets have the same corrosion-resistant properties as plain stainless steel sheets, making them suitable for outdoor applications.

2.How long does a PVD colored stainless steel sheet last? Will the PVD color fade?

The lifespan of a PVD colored stainless steel sheet depends on the thickness, quality of the substrate, and maintenance. With proper maintenance, a PVD colored stainless steel sheet installed indoor can last for decades.

3. Can PVD colored stainless steel sheets be custom made? How to do customization?

Yes, PVD colored stainless steel sheets can be custom made to match the specific requirements of a project. Customization options include color, texture, finish, size, and thickness.

4.Are PVD colored stainless steel sheets expensive?

The price of PVD colored stainless steel sheets can vary depending on the color, finish, texture, and thickness. However, they are generally more expensive than plain stainless steel sheets due to the additional coating process and customization options.

5.How do I know if a PVD colored stainless steel sheet is high quality?

A high-quality PVD colored stainless steel sheet should have a uniform color and finish, with no visible defects or imperfections.

6.Can PVD colored stainless steel sheets be recycled?

Yes, PVD colored stainless steel sheets can be recycled, as they are made from stainless steel, which is a highly recyclable material.

7.How can I ensure that the PVD colored stainless steel sheet I receive matches my desired color?

It is recommended to request a color sample from the supplier or manufacturer before placing an order. This can ensure that the desired color is achieved and matches the intended design.

8.What is the minimum order quantity for PVD colored stainless steel sheets?

Usually 10pcs of standard sizes/finishes/colors and 50pcs of customized sizes/finishes/colors.

PVD Stainless Steel: The 8 Key Factors You Want to Know

Physical vapor deposition (PVD) is one of the advanced technologies of coating. Compared to other conventional coating methods along with the wet chemical coating method. PVD is a more precise and accurate coating technology. PVD with its modified forms like CVD and ALD has revolutionized the world of surface engineering and coating. PVD Stainless steel is coated with different materials to enhance the surface properties of stainless steel for desired applications. PVD vacuum-plated stainless steel provides capabilities and opportunities to be used in different applications by surface engineering its properties.

 

 

 

What is PVD coating on stainless steel?

 

PVD stainless steel means that different metals in the form of vapors are deposited on the surface of stainless steel. These PVD-finished stainless steel provides wear resistance, corrosion protection, aesthetic PVD finish, durability, sustainability, improve cleanability, and help in fiction reduction. There are different grades of stainless steel used which are depending on their properties for different applications. Some of them are listed below 200 grade is the cheapest and used for low-tech applications while 300 grade is expensive with good corrosion resistance which is used for high-tech applications.

 

200 grades: provides good formability but poor corrosion resistance and has a low content of nickel and a higher content of magnesium.

 

300 grades:is the expensive grade with good corrosion resistance, formability, and wettability. The most commonly used grades for different applications are 304 and 316.

 

400 grades: commonly used for applications where high heat resistance is required but has poor corrosion resistance. It has high magnetic properties with high carbon content.

 

 

 

 

PVD metal finish

 

Physical vapor deposition as the name describes uses the metal in vapor form to be deposited onto the metal surface. The formation of metal vapor does not require any chemical reaction rather it's a physical method of vapor formation. Physical vapor formation in PVD is done by physical means like heating, induction heating, resistance heating, electron beam, laser, and plasma. PVD finish is precise and accurate because it is an atom-by-atom top-down approach of coating.

 

PVD equipment set up.

 

YouTube video showing PVD finish surfaces.

 

https://www.youtube.com/watch?v=6V_-ABAJloc

 

 

Black PVD stainless steel

 

PVD finished stainless steel finish is used for a sophisticated aesthetic look to the product and for durability. Normally this PVD stainless steel finish is done on decorative accessories, jewelers, watches, and rings to give them a black-colored aesthetic look including Diamond-like carbon finish (DLC), Titanium Carbonitride (TiCN), and Chromium Nitride (CrN).

 

 

YouTube video showing black PVD finish on Stainless steel.

 

https://www.youtube.com/watch?v=QAwuLYswkBg

 

 

 

Gold PVD stainless steel

 

To enhance the properties and aesthetic look of stainless steel, it would be given a PVD finish. The gold PVD stainless steel meaning they are coated with a material that provides them different shades of gold colors depending on the grade and type of stainless steel you are coating. The shades also depend upon the surface roughness and surface treatments before the PVD finish. The gold PVD-finished stainless steel means these are coated with zirconium nitride or titanium nitride. There are different grades of gold PVD stainless steel coatings listed below.

 

 

 

 

8 Factors you should Know about Physical Vapor Deposition:

 

  1. Substrate finish and preparation: For the best PVD finish, the surface should be contamination-free and fully clean for good adhesion and PVD coating. The surface should be roughened for better adhesion. PVD sheets for coating should be buffed and polished before coating.
  2. Adhesion: PVD vacuum-plated coating must be strongly adhesive to the base material retaining its properties for a longer service time. The PVD finish with good adhesion can be enhanced due to ion bombardment during deposition and proper cleaning effect.
  3. Uniformity and conformity: Due to the atom-by-atom deposition approach, the PVD finish is uniform all over the surface. It provides good conformity to the finished product.
  4. Complex surface coverage: The vapors are a gaseous state of matter due to their Brownian motion they can move to every space available to them. This Brownian motion of vapor allows them to uniformly cover the complex shapes giving them uniform and conform PVD finish.
  5. Less weight-high strength: We know that PVD vacuum-plated parts are precisely lightweight coatings with high adhesion to the surface, providing them with high strength. This ability makes them suitable for high-tech applications where lightweight fabrication is key for aerospace and automotive industries for less fuel consumption.
  6. Less material more output: Physical vapor deposition because of its ability to deposit by vapor phase deposition uses very low material with full uniform coverage. Providing full strength and high coverage output with less material utility. Making PVD finish a material-sustainable method of coating as compared to the conventional method.
  7. Aesthetic PVD finish: Provides a fine, uniform, precise, and accurate PVD finish.
  8. Pure metal PVD finish and alloy PVD finish: We know that some metal gets oxidized when subjected to high-temperature melting for coating. These materials like Aluminum and titanium are very hard to coat in pure form by conventional methods due to their ability to form a quick oxide layer in the presence of air. From physical vapor deposition, pure metals like aluminum and titanium can easily be coated in a vacuum that prevents the oxide formation. Similarly, alloy coating is possible by PVD.

 

 

 

What is PVD coating used for

 

PVD finished stainless steel coating is used to enhance properties like durability, aesthetic look, wear and corrosion resistance and increasing fatigue life by the smooth finish for different parts used in different industrial applications. Some of them are:

 

 Architecture designs: The exterior and interior elements of architecture are given a black PVD stainless steel finish.

 

Electronics parts: Smartphones, mobile and laptop bodies, washing machines and refrigerator parts, and other electronic devices are PVD stainless steel finished.

 

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Kitchenware: Utensils and appliances used in the kitchen are black PVD-finished stainless steel for durability and authenticity.

 

Medical devices: For wear resistance, corrosion resistance, and cleanability the medical devices are black PVD finished stainless steel.

 

Automotive industries: Less weight coating with less material utility but high outcomes and good strength, PVD vacuum-plated metal coatings are the best choice for such high-tech applications.

 

Watches and Jewelry: black and gold PVD-finished stainless steel gave watches and jewelry a luxurious aesthetic look.

 

Here is a YouTube video of a PVD stainless steel sink.

 

https://video.search.yahoo.com/search/video?fr=mcafee&ei=UTF&p=application+of+PVD+stainless+steel&type=E210USG0#id=3&vid=4bff2ae2d52dd23&action=click

 

 

PVD stainless steel sheet

 

 

Stainless steel PVD sheets have a normal thickness of 0.1-0.2 microns but to increase their durability, corrosion protection, wear resistance, and scratch resistance we can make thicker coating some of the sample types with their thicknesses and natural coating is listed below in the table.

 

 

 

Different stainless steel PVD sheet types with thickness variations.

 

PVD stainless steel means different material coating giving them different aesthetic colors listed below.

 

  1. Gold PVD sheets
  2. Coffee PVD sheets
  3. Champagne PVVD sheets
  4. Black PVD sheets
  5. Copper PVD sheets
  6. Carbon Black PVD sheets

 

Different sheets color of PVD finished stain less steel.

 

There is different type of physical vapor deposition stainless steel sheets given below

 

Etched PVD stainless steel sheets: This etched PVD stainless steel is the protective acid resistance film which was was applied on an efficiently polished surface. The unprotected part was acid etched. There is multiple way of applying the film by hand painting, silk screening, and other methods. This PVD-finished stainless steel is high-end, elegant, with high corrosion resistance, and available in different patterns and colors.

 

Etched PVD-finished stainless steel.

 

 

Bead blast PVD finished stainless steel sheets: After PVD coating, it was processed by zirconium beads giving the sheet a fine bead-like surface. This PVD sheet gives a rich color, aesthetic look, excellent mechanical properties, and high corrosion resistance.

 

Bead blast PVD finished stainless steel sheets

 

 

Embossed PVD finished Stainless steel sheets: PVD sheets are finished by pre-metal stamping process to produce a sunken design. These patterns are formed by passing sheet through rollers. Then PVD coating is done. These PVD finish are popular in high traffic areas reduce the fiction from 30-70%, increasing the strength, increasing scratch resistance and anti-pressure property.

 

Embossed PVD finished Stainless steel sheets.

 

 

Anti-fingerprint PVD finished stainless steel:

 

It's the advanced nanotechnology process that gives long-lasting protection to stainless steel. It protects the surface from dust, water, fingerprints, and oils. It's easily to clean. These PVD finishes provide high film adhesion, corrosion protection, and durability.

 

Anti-fingerprint PVD finished stainless steel.

 

 

Mirror PVD finished stainless steel sheets: These PVD finish are highly polished surface come with double PVC film. There are two types of Mirror PVD stainless sheets ordinary and super mirrors. These PVD finish surfaces are easy to clean, elegant and have high corrosion resistance.

 

Mirror PVD finished stainless steel sheets.

 

 

PVD stainless steel jewelry and watches

 

PVD finish is required to stainless steel and it provides color to stainless steel jewelry and watches, avoid rust and corrosion, give cleanability, shiny appearance and help in avoiding scratches. There are normally two methods to plate jewelry and watches.

 

  1. Electroplating
  2. Physical vapor deposition.

 

 

 

Why PVD is better than electroplating?

 

PVD-finished stainless steel coating remains longer than electroplating. Coloring the stainless jewelry with electroplating is not a vibrant and stable choice compared to which PVD is best. PVD provides a shining glowing texture but can also provide Matt texture. Helps in providing multiple exciting textures to jewelry and watches. IPG machine is used stainless steel jewelry PVD coating.

 

 

PVD coated stainless steel pipe

 

 

PVD vacuum plated stainless-steel pipes are used in diverse applications like corrosion resistance to railing components, automotive exhaust system and architectures industries. These PVD finish provide durability, aesthetic looks and wear and corrosion resistance.

 

PVD coated stainless steel pipe

 

 

PVD stainless steel Fitting

 

PVD finished stainless steel fittings used in benefiting exhaust system, interior and exterior fittings in architectures parts, automotive fitting parts, and medical equipment's fitting parts. They help to increase the base material properties like durability, cleanability, wear resistance, and corrosion protection.

 

PVD finished stainless steel fittings.

 

 

 

PVD stainless steel vs stainless steel

 

Stainless steel is best known for its corrosion protection due to the presence of chromium but for high-tech applications and high aesthetic look only stainless steel is not enough. So, we surface-engineered the surface of stainless steel with PVD coating to enhance its properties. PVD stainless steel opens a long range of applications for stainless steel by increasing its wear resistance, high thermal sustainability, durability, and corrosion protection.

 

 

Stainless steel vs black stainless steel

 

Black stainless steel used for giving sleek, sophisticated, expensive, and aesthetic look to parts compared to normal stainless steel. This Black PVD stainless steel means that a thin layer of diamond Carbon-like coating is done to enhance the stainless-steel properties.

 

 

 

Does PVD coating wear off?

 

Different factors may influence the wear of PVD finish like

 

  1. Thickness of the metal coated
  2. Presence of abrasive metal or chemical
  3. Extreme temperature exposures
  4. Long time UV rays' exposures.
  5. The composition and strength of coated material.
  6. The type of chemical and method used for cleaning and maintenance of components.

 

 

How long does PVD coating last?

 

The PVD coating life depends upon the type of composition of the coating, its compatibility with the base material, adhesiveness to the base material, and most importantly the environment of on-service life. The environment in which it is placed is harsh and abrasive the coating will be damaged earlier compared to the healthier environment. Along with avoiding harsh on-service environment maintenance and cleaning plays a key role in the life of PVD finish.

 

 

 

Pros and Cons of PVDS stainless steel

 

 

Advantage

 

PVD vacuum-plated finish provides the following benefits to the parts.

 

  1. Low fiction
  2. Increase wear resistance
  3. Provide corrosion resistance
  4. Aesthetic appearance
  5. Durability
  6. Tailored properties.

 

 

Disadvantages

 

PVD vacuum-plated finish provides the following disadvantages to the parts.

 

  1. Thickness limitation
  2. Expensive
  3. Complex technique
  4. Adhesion challenges
  5. Metal that cannot be vaporized cannot be coated
  6. Base material compatibility issues
  7. Color variations.

 

 

 

Which metals can be PVD coated

 

Metals that have appropriate vapor transition temperature. As, the PVD happens in vapor form so the metals that undergo vapor formation at very high temp cannot be PVD coated. The metal should have ability to be uniformly coated atom by atom. Followings are the name of metals capable of PVD coatings.

 

  1. Stainless steel
  2. Aluminum
  3. Titanium
  4. Zirconium
  5. Nickel
  6. Copper
  7. Tin
  8. Gold
  9. Silver
  10. Cobalt and platinum.

 

 

 

Why choose Tuofa for PVD Stainless Steel Service

 

Toufa is one of the most highly equipment company with advance coating techniques in China. Toufa is well-known for its excellent service of providing highly advance machining parts with highly precise coating techniques. Toufa is well-known for their expertise in hard metal manufacturing. It has advance expertise in providing highly precise and thin stainless steel coated parts with highly advanced PVD techniques. They have expertise in providing 50 surface treatment services. You can get more information from Tuofa.

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