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Trivalent Chromates Revisited
I normally do not write about recent papers in the technical literature. However, a paper that appeared in the October issue of Plating and Surface Finishing was of great interest and requires wider distribution. The paper, “Unexpected Results from Corrosion Testing of Trivalent Passivates,” by T. Rochester & Z. W. Kennedy, discusses results using one of the standard tests for the presence of hexavalent chromium.
Read MoreBlisters on Aluminum
After silver plating machined aluminum we test the parts by heating to 175oC for one hour. During the soldering step a good percentage of the parts blister. Do you have any suggestions for eliminating this problem?
Read MoreA Conversation with Duncan Beckett
Global Product Manager, Engineered Coatings, MacDermid plc
Read MoreDurable Bronze Finish
The designer wants a dark bronze color. What is the best way to obtain that color on a 1/4-inch wide strip so that it holds up to foot traffic?
Read MoreDuplex Sealing With Nickel Acetate and Di Water
Question: In past Anodizing Clinics you have talked about duplex sealing using, first, a relatively concentrated (3–5% by weight) nickel acetate bath followed by sealing in deionized water as a good way to seal dyed anodic coatings.
Read MoreType 416 Stainless Steel and Adhesion
After plating we observe blistering and peeling. We have tried a number of different plating cycles without ant success. What do you suggest?
Read MoreYellowing of Stainless Steel
I read your April 2007 article with great interest, as we have a similar problem with powder coated Type 430 stainless steel and we have also been seeing yellowing. Unfortunately, at this time I can’t give you the powder coating composition, but could that be the source of our problem? Or is it simply that Type 430 stainless is a bad grade and we should be using Type 210 or 304?
Read MoreFlexible Thickness Measurement
Instrument handles variety of coatings, thicknesses and substrates
Read MoreHigh-Volume Copper Finish
I am working on a high-volume project for store fixtures where the displays have large parts. They call their finish darkened bronze. Is it possible to achieve the desired look with powder coating? Any recommendations on product or process? Do you know of any companies who are currently providing this finish?
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