HOME FAQs BOOKS JOBS: Help Wanted Suggestions you are here: Hotline/Forum => Letter 17096

Nickel plating that could pass one (1) cycle CASS Test?

Our previous practice of corrosion resistance test for our purchased Nickel plated screw was 24 Hr SST, which gave us fair result.

Recently, the requirement of this test has been changed (upgraded?) to one cycle CASS Test. Thus, we experience corrosion quality problem for these.

I'd like to hear yours experience and ideas that could overcome this. (post-treatment, passivation?)

p/s: Cr plating after Ni is unlikely, appearance of the Ni finishing is required.

Rgds

Chee Hong, Lee
- Singapore

There is but nothing in passivation or lacquering that will work on screws. The only way to meet the spec is to go for duplex nickel, with an 80% thickness of sulphur free layer and 20% bright layer.

Khozema Vahanwala
Saify Ind

Bangalore, Karnataka, India

+++

I'm testing on triplex nickel plating. Additional a thin high-sulphur nickel between the semi and bright nickel. Have yet to know the outcome.

Chee Hong, Lee
- Singapore

ANSWER or FOLLOW UP POST an unrelated QUESTION HOT Topics

Disclaimer: It is not possible to diagnose a finishing problem or the hazards of an operation via these pages. All information
presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The
internet is largely anonymous; some names may be fictitious and some recommendations may be deliberately harmful.

If you are seeking a product or service related to metal finishing, please check these Directories: