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Letter 17096
Nickel plating that could pass one (1)
cycle CASS Test?
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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
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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.
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Khozema
Vahanwala
Saify Ind
Bangalore, Karnataka, India
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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
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