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Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ

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Thickness for salt spray

What is the standard salt spray hours for the screw that the plating thickness is 7.42 - 9.74 .

Yong Bee Hoon
Screw Specialist - Penang , Malaysia
2007

Since you are talking about screws, Yong, the plating you are talking about is presumably zinc? Or maybe zinc alloy? The answer will depend on whether you are talking about hours to red rust or hours to white rust. Usually people are talking about white rust. And the period to failure will therefore depend more upon the type of chromate conversion coating than the thickness of the zinc. In these days of very capable trivalent chromates, a minimum specification could perhaps be 96 hours, but anywhere from 8 to 240 are possibilities.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2007

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