Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
-----
Yellow chromate versus clear chromate
I am using a sheet metal part with a plating for a 70 °C application. Am I better off using clear (zinc, I think) chromate or yellow chromate? I have heard conflicting stories as to whether clear chromate can handle the temperature. Since cost is an issue, I would like to use the clear chromate coating if it will stand up to the temperature without turning to powder.
Don Dziubakowskimfgr - Seven Hills, Ohio, USA
2004
Are you referring to zinc plated steel followed by a chromate conversion coating? If so, chromates clear or yellow will not retain its protective properties when exposed to 70 °C for a period of time. The coating dehydrates and cracks. If no zinc plating a chromate conversion coating will not work on steel. If you are inquiring about a zinc-zinc chromate primer, this will work at 70 °C.
Don Baudrand
Consultant - Poulsbo, Washington
(Don is co-author of "Plating on Plastics" [on Amazon or AbeBooks affil links]
and "Plating ABS Plastics" [on Amazon or eBay or AbeBooks affil links])
2004
Q, A, or Comment on THIS thread -or- Start a NEW Thread