Manufacturers use many coatings and finishing processes to enhance and protect their products. These include cleaning, plating and powder coating. Based on the process and the coating, a specific result is achieved. Without finishing, parts and products would not be resistant to corrosion and wear, their lifespan would be greatly reduced, and the aesthetic of the product would be diminished.
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Steps In The Finishing Process
The finishing process is the same, more or less, no matter who or where it is done. Pre-treatment of the part includes preparing the surface. The part is treated to remove any oils, grease, chemicals, or other cleaners before any coating is applied. Using baths and rinses, the part is physically and chemically altered. During post treatment, other finishing procedures are used to improve the properties of the part.
Powder Coating
Powder coating is regularly used in manufacturing to coat metal parts and machinery. Powder coating provides protection against corrosion, chipping, scratching, and general wear and tear. And of course, produces an attractive final product. Powder coating extends the life of the equipment, and its smooth finish makes cleaning and maintenance easy.
During the powder coating process, the free-flowing batch of powder is applied to the product using an electrostatic process. Once the product is cured in an oven, the powder melts, flows, dries, and hardens to form a thick, solid, durable coating. Powder coating can be accomplished via electrostatic spraying, an electrostatic fluidized bed process, or an electrostatic magnetic brush. To cure a thermoset powder, the workpiece must be exposed to elevated temperatures to allow; known as crosslinking, this requires high-temperature exposure for a specific amount of time, depending on the desired properties and material.
The Powder Coating Industry
The need and demand for powder coating continues to increase for manufacturing applications. This is true in part to powder coating being unmatched in providing durability and efficiency. The application process creates a strong bond between the coating and the surface, ensuring the product can endure extreme conditions while providing beauty and color. This process not only reduces waste, but also cuts energy costs due to its faster curing times.
Powder coating isn't simply a surface coating; it bonds to and integrates with the product's material forming a flexible, tough layer that is durable and intensely resists impacts, moisture, chemicals, and the sun.
Diverse Manufacturing Applications
Powder coatings offer a wide range of advantages in manufacturing, particularly in high-volume production where efficiency is vital. This coating method provides a more durable finish than traditional liquid paints, with superior resistance to chipping, scratching, and corrosion. It also allows for a wide range of colors and finishes, enhancing the aesthetic appeal of products. The process is also more efficient, as it typically requires less time for curing and drying, which can significantly increase throughput and profitability.
Production Systems offers reclaim and non-reclaim powder coating rooms for powder coating applications. We also have industrial powder coating ovens and enclosures. Contact us to learn about our booth and oven sizes, styles, and options. We are ready to assist your company in designing the right powder coating booths and ovens for your powder coating process.
Many industrial coating processes find use in the part manufacturing sector. This section will introduce the common ones, processes, compatible materials, benefits and limitations.
Epoxy coating is the application of an epoxy layer created by a resin and a hardener to a part. The final part has better mechanical properties and chemical resistance. Epoxy coating is common in industrial, commercial, and residential settings.
Epoxy is compatible with metal, plastic, wood, brick, ceramics, and concrete. However, the coating does not adhere to silicone, vinyl, rubber, parchment, and wax.
After surface preparation, which involves cleaning the substrate to remove contaminants like dust, oil, and grease, mix the resin and the hardener according to the manufacturer's instructions. Apply the mixture on the part surface using a brush or and cure the epoxy-coated part to harden the coating.
Polyurethane coatings form after reacting a polyol or a polyamine and an isocyanate with firm, durable, flexible, chemical resistant, and abrasion resistant surface coating. Their flexibility ensures they expand to match the substrate's expansion. However, they do not absorb impacts, restricting their use to the automotive, flooring, and marine sectors.
Polyurethane is quick-drying and is compatible with use on wood, metal, or painted surfaces.
Polyurethane coating involves cleaning the part surface and applying a primer to improve its adhesion. Mixing the two components (a polyol or polyamine and an isocyanate), applying the polyurethane mixture to the part using a brush, roller, or spray equipment, and curing will create a polyurethane-coated part.
Polysiloxane coatings are advanced protective coatings composed of silicon-oxygen bonds, which are immensely responsible for their exceptional durability, UV stability, and flexibility. It is a strong, waterproof polymer made of polymers that form successive layers of tight films, making it highly resistant to environmental factors.
Polysiloxane coatings are compatible with steel, aluminum, galvanized metal, concrete, plastics, glass, wood, ceramics, and composite materials.
Clean the part and apply a primer to improve the part's adhesion. Afterward, mix the base and curing agent according to the manufacturer's instructions and apply the mixed Polysiloxane coating using brushes, rollers, or spray equipment. Cure the just-coated surface for a specified period.
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A zinc-rich coating is a layer of zinc particles deposited on a part that provides a substrate with good corrosion resistance and aesthetic value. The zinc layer is a sacrificial material that works because it is more reactive than the substrate. As a result, it absorbs the oxygen molecule that would corrode the substrate even when scratched.
Zinc coating is compatible with metals like steel, iron, and aluminum and is primarily used to protect them from corrosion.
Clean the surface to remove contaminants and pretreat the surface with pickling, degreasing, or abrasive blasting to enhance adhesion. Afterward, use hot-dip galvanizing, electroplating, or spraying to coat the surface with zinc. Allow the zinc-coated part to cool, and inspect for uniformity and coverage.
Ceramic coating is a permanent or semi-permanent solution that involves applying a polymer solution to a part's surface. The coating blends with the surface and creates a hydrophobic layer of protection.
It is common in the automotive industry, especially in painting. The chemical bonding and creation of a new layer leave the car's factory paint job untouched.
Ceramic coating is compatible with various materials, including metals (steel, aluminum, titanium), plastics, glass, composites, etc.
Ceramic coatings are applied through thermal spraying, which involves using high-temperature plasma or flame to melt ceramic powders, spraying the molten ceramic onto the substrate, and allowing it to cool. Other methods include dip and spin coating, which involves immersing or spinning the substrate in a ceramic slurry. Afterwards, the part is dried and sintered.
Similar to zinc coating, metallic coatings involve protecting a part with a layer of metallic particles such as aluminum, nickel, chromium, etc. Each metallic particle has unique functions. For example, chromium coating can protect parts from corrosion, while aluminum improves corrosion resistance and aesthetics.
Metallic coatings are compatible with various metals including steel, aluminum, and titanium.
After cleaning the part surface to remove contaminants that can reduce the final part's quality, apply the metallic coating by thermal spraying or electroplating. Thermal spraying involves melting the metal powders, spraying the molten metal onto the substrate, and allowing it to cool.
On the other hand, electroplating involves immersing the substrate in a solution containing metal ions. When an electric current passes through the solution, metal ions are deposited on the substrate.
What are Things to Consider When Choosing Industrial Coatings?
Selecting the ideal industrial coating depends on understanding the coating process and some factors that can affect its Use. This section will introduce several factors that can aid in selecting the best coating process for your project.
Every coating process highlighted above has a specific substrate it is compatible with. For example, metallic coatings are majorly compatible with metals, while epoxy is compatible with metals, wood, and concrete.
The substrate's need can also affect the choice of coating. Polyurethane coating is a common method for anti-corrosive properties with UV protection for metals, wood, and plastic.
The environment of use can also determine the coating process. Consider weather, temperature, UV, and chemicals. Choose a coating technique that will provide the necessary attributes.
For example, polysiloxane coating is a better option than epoxy coating when looking for a corrosion and UV-resistant part.
Practical considerations such as ease of application, drying time, and curing conditions can also determine the surface coating technique.
Epoxy, polyurethane, and polysiloxane coatings differ from zinc plating based on the application process. The three require mixing the bases and using rollers, sprays, or brushes. Zinc coating, however, goes a step further by allowing hot dip galvanizing.
The performance of the part will require a unique degree of resistance to corrosion, abrasion, impact, etc. This, in turn, will determine the ideal coating process for your project. When you are looking for a part with UV resistance, epoxy coating is not the best option compared to polysiloxane and polyurethane. You should choose a method that ensures you meet your performance goals.
The cost of the indented process will shape your choice. However, choose a process that concerns performance while not breaking the bank. For example, zinc coating is a cheaper process than epoxy coating.
The regulation associated with using the part can also determine your coating processes. As a result, you should ensure you comply with the standards governing industrial coatings and opt for coatings techniques that meet industry-specific certifications and standards.
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