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"Salt spray testing assembly with both zinc plated and galvanized components"



April 26, 2010

If salt spray testing (ASTM B117) an assembly with both hot-dipped galvanized parts and zinc electroplated components within the assembly, will the zinc electroplated components prematurely rust due to the sacrificial nature of the hot-dipped zinc? Basically, will a salt spray test yield insufficient data?

Scott Mudra
Manufacturing - Fox Lake, Wisconsin, USA
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April 26, 2010

Hi, Scott. Salt spray tests are primarily quality assurance tests to verify that an established process has not deteriorated. When used for other purposes, interpretation can depend on a lot of factors. So, when you say: "will a salt spray test yield insufficient data?", I don't know what you mean.

Zinc electroplating is much thinner than hot dip galvanizing and will not last nearly as long in the real world. I don't think it will last nearly as long in a salt spray cabinet either, although any zinc on the assembly will to some extent protect any steel that is electrically connected to it.

Regards,

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