plating, anodizing, & finishing Q&As since 1989
Yellow chromate for Cad, Zinc and Zinc/Nickel
April 24, 2010
Q. We currently Cyanide Cad plate for the aerospace industry. Our line consists of the following process tanks (850 gal cap):
1 soak clean
2 alkaline clean
3 HCl pickle
4 Nickel strike (if required)
5 CN Cad plate
7 yellow chromate
We have counterflow rinse between each process tank. We have no electroclean tank.
Within the next 10 to 12 months we plan to add Non-Cyanide Zinc and Zinc/Nickel plating processes. Because of space limitations we would like to do this with as few additional tanks as possible.
For our pre-plate cleaning cycle, will we need to add an electroclean tank?
For the post-plate yellow chromate conversion coating, Will we require three different yellow tanks or will one formulation handle all three processes?
Lab/Facilities Mgr - Denton, Texas, USA
April 30, 2010
A. You are doing work for the aerospace industry, so I guarantee it that your aerospace customer(s) has a specification that you need to comply with. That specification(s) tells you exactly which solutions are approved for your use, what order they need to be performed in, and what the concentration should be run at. You really will have very little choice in the matter.
Jon Barrows, MSF, EHSSC