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A. Brush plating on aluminum is possible.
However, the plating condition varies considerably depending on the series of the aluminum. The 1000 series, which is close to pure aluminum, is difficult to ensure adhesion, while the 5000, 6000, and 2000 series are relatively easy to process.
Also, if the plating film is not etched properly and the oxide film is not removed reliably, the plating film will not adhere and will peel off quickly, so the degree of difficulty of the work is slightly higher than for other metals.
A. Brush plating on titanium is not possible because there is no pretreatment solution suitable for titanium.
A. We do not handle hexavalent chromium due to the theoretical difficulty of brush plating and the fact that the liquid is a hazardous product.
Instead of hard chrome, we offer a chrome-colored plating solution (BP-CR-02 Nickel Cobalt Plating Solution(hexavalent chromium color)).
A. We do not recommend the use of ordinary tank plating solution for brush plating due to the difference in composition between ordinary tank plating solution and brush plating solution.
A. The role of the degreasing cotton is to retain the plating solution and prevent the brush tip from directly touching the treated surface.
In particular, if the brush tip is carbon, some powder will come out from the carbon, so please use a degreasing cotton to prevent contamination.
A small amount of degreasing cotton is also included with the brush tip.
A. The flow of brush plating is as follows.
Electrolytic degreasing → activation → strike silver plating → silver plating
For silver plating, the solution is mixed just before use to ensure bath stability.
For this reason, the process is divided into 2 parts, the main solution and the A solution, and consists of the following four components.
Strike (main solution) 100mL, Strike (solution A) 500mL
No Cyanide Silver (High Concentration Main solution) 100mL, No Cyanide Silver (High Concentration Liquid A) 500mL
Striking must be performed to prevent peeling of the silver plating to be performed later.
A. This is an industrial brush plating and is not sold to individuals. Because the plating solution contains hazardous materials, we restrict this product to businesses entity with a responsible person in charge of handling toxic chemicals.
A. We can provide sample plating for a fee on the premise of purchase. However, please note that we may not be able to accept sample plating depending on conditions.
A. No, we do not provide demo or rental equipment for brush plating.
Q. We have a 400-gallon sulfamate nickel tank used to process ferrous-based parts that are rack plated to 18 microns for a high heat exposure application. Every so often we barrel plate smaller ferrous parts to 12 microns in this tank and we encounter problems. We generally have a high yield and overall good results when plating the rack parts, but with the barrel parts, we experience many problems with poor adhesion, flaking and deposit poor ductility resulting in high rejection rates. What can we do?
A. Unfortunately, the “art” and practical experience of plating sulfamate nickel (SN) is getting lost in our industry today. Earlier in my 33-year career, I had the experience of working with many of the pioneers who lived and breathed life into many types of applications for SN plating extending from the 1960s through the early 1990s. In July 1954, at the 41st annual convention of the American Electroplaters’ Society, Richard C. Barrett of the Barrett Chemical Products Co., who was one of the pioneers for this process, presented a good overview of this relatively new process, which helped the technology find a market. Barrett, who ultimately sold the technology, know-how and manufacturing rights in the 1960s to Kelite Co., carried on with marketing the “Barrett Sulfamate Nickel” brand. The brand represented high quality technology that found its way into the USA Space Program and other military or industrial demands including electroforming. It was in the Allied Kelite era of the mid 1970s to 1994 that a lot of application work was completed to continue commercializing the Barrett SN process technology for many high-end applications. Unfortunately today in our industry, SN technology is too often thought of as a commodity, which makes it difficult for suppliers to help applicators solve problems as was traditional in the past.
Specific for SN barrel plating, Barrett and Kelite performed a lot of studies to understand the application. One advantage of an SN deposit is the use of minimal additives in those systems that occlude organics into their deposits. As a result, these deposits have very low porosity and good grain structures that provide unequalled ductility, critical for part forming after plating. Their deposit purity also lends to very high temperature application protection, up to 1,260°C, and their low internal stress provides a range of benefits for many critical applications.
Because of this high purity characteristic, under given conditions during plating, sometimes deposit passivity can be the result. At traditional high current density applications and constant electrical contact, typical of rack plating, there is less susceptibility for passive deposits to occur. In barrel plating, there is higher risk of a passive nature resulting from this high deposit purity because the tumbling action of parts causes interruptions of the flow of current to the surfaces in a given load.
When barrel plating SN is required, the following four conditions and adjustments for the SN chemistry help increase deposit activity and have demonstrated success reducing passive defects occurring in these applications:
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In this case, the best answer to your question ,with respect to chemistry requirements of the SN and because of the variation required, is to consider a new solution makeup or new tank installation for use when barrel processing parts. Trying to utilize a single chemistry with the rack parameters will only cause continued issues plating sulfamate nickel in a barrel application.
Brad Durkin is director of international product management at Coventya, coventya.com.
Originally published in the February 2017 issue.
Applications, plating solutions, brighteners, good operating practices and troubleshooting.
Question: I am new to this industry and have heard about smut and desmutting operations.
Masking is employed in most any metal finishing operation where only a specifically defined area of the surface of a part must be exposed to a process. Conversely, masking may be employed on a surface where treatment is either not required or must be avoided. This article covers the many aspects of masking for metal finishing, including applications, methods and the various types of masking employed.
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