46231

Not reaching required Salt Spray hours with zinc plating and trivalent chromate  

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dear sir
Hi, I am Kiran Reddy.
I am facing lot of problems with plating-related issues -- let me give you the datails of our customer specification .
1."Zinc plate & Trivalent chromate leached & sealed"

2."White Rust - 120 Hrs
Red Rust - 240 Hrs"
My doubt is can we achieve the above salt spray requirements of our custome?
if yes pl let us know how to have countrol.
our compoments have failed the salt spray at 74hr even after trivalent plating.
what do we mean by leached & sealed?
is there any relation b/t plating thickness and salt spray.

thanking you,

Kiran Reddy
- Bangalore, Karnataka & India

Mr. Reddy your requirement is easily achieveble.Use better Trivalent chromatechemistry avilable in the market and select the best plating process. ( Preferebley Alk.Zinc)With respect to Acid chloride system good control and maintance is required in terms of organic buildup. Consult your chemical supplier how to achieve your requirement.

Best Regards,

P. Gurumoorthi     electroplating process chemicals Chennai, Tamilnadu, India

Dear Frd,

If you are plating any intricate parts try to check the thinckness of the substrate everywhere. It its more than 8 microns then you can be sure that it will pass 240 hours of salt spray. Also during passivation you may loose 1 or 2 microns. So plate some extra thickness. That may help you. Your salt spray life depends on pre treatment and chemistry. Try working on passivation more. Does your plated component becomes black after some months(which is not subjected to salt spray. If so anlayse the bath for inpurities and and do the needful.

All the best,

S.V. Aurobind
plating process supplier - Bangalore, India