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Which of the following can increase the corrosion rate of carbon steel via hydrofluoric (HF)...

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Which of the following can increase the corrosion rate of carbon steel via hydrofluoric (HF) acid corrosion?

A.

High nitrogen content in process

B.

Oxygen contamination

C.

HF acid concentration above 98%

D.

Weld hardness above 200 BHN

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