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ASTM B633 vs. F1941 - Correlate salt spray life

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renasis

Mechanical
Joined
Dec 29, 2002
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56
Location
US
Hello,

If a screw has a Fe/Zn 5 Type III ASTM B633 plating, what does that equate to in ASTM F1941?

Thanks,

-ren
 
That equates to code Fe/Zn 5A, which would provide 6 hours to first appearance of white corrosion products, and 24 hours to first appearance of red corrosion products during neutral salt spray testing.
 
CoryPad,

Thanks for the response. Why wouldn't it be 5B? I believe B633 states 12 hrs before first sign of corrosion.

Thanks,

-ren
 
5B is a better fit than 5A, because the requirement for white corrosion would be 12 hours rather than 6.
 
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