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Black Oxide Coating Get Rust

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180994

Mechanical
Joined
Oct 27, 2016
Messages
7
Location
MY
Dear Expert,

I need some advise.
I have a Ball Valve A216 WCB Butt Weld with black oxide coating get rust after installation by customer.
Is it getting rust due to the welding effect?
 
It could make it worse, but the black oxide isn't corrosion resistant.
The oil that it is saturated with is what gives you corrosion resistance.

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P.E. Metallurgy, Plymouth Tube
 
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