Q. I recently received General Motors specification GMW3359 for non-electrolytically applied zinc-rich coating. Can you give me more information about this process?
We have a problem with our acid nickel bath. What was once a bright nickel color is now a gray color, although it still looks bright. When we set the rectifier to the correct amperage for the load, the parts appear to burn. Also, we can only leave the parts in for about 1 to 3 min or they will start to turn black and smoky-looking. Any suggestions as to what the problem might be?
Where can I learn more about additives to plating baths? I want to formulate some of my own and avoid the high prices charged by plating chemical vendors.
We have been barrel plating flat parts, but the parts do not meet the customer’s corrosion requirements, and we now have to resort to rack plating. Can you provide a brief explanation for the significant difference in cost?