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Ni alloys aquous corrosion

Ni alloys aquous corrosion

RE: Ni alloys aquous corrosion

In HF alkilation units service oxygen is prone Monel.

Oxygen dissolves in, and tends to stay with, the HF acid and accelerates corrosion of, Alloy 400 and copper alloys. It can enter the unit through a number of sources including imported feedstock, FCC wet gas compressors, improper operation of a caustic treating unit, or improperly charging fresh acid into the unit, particularly if oxygen contaminated nitrogen is used. Oxygen is extremely difficult to monitor once it gets into the unit, and can only be removed through the venting of non-condensables into the flare header.

Luis Marques

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