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Home > Forums > Industrial / Manufacturing Engineers > Activities > QC, Inspection & Testing engineering Forum

Coppercoat in HF Alklations units

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stopsunset (Mechanical)

25 Jan 12 9:44

I've seen that a copper based thread lubricant is not recommended for use in HF alkylation units, rather a Nickel base anti seize compound is recommended. Why is that? I've heard that for marine applications to prevent a galvanic cell from forming but not HF units.Thanks

rustbuster (Petroleum)

8 Feb 12 14:22

Both copper and nickel will suffer corrosion in HF. API-751 may have your answer.

Viking5711 (Materials)

27 Feb 12 16:08

http://www.onepetro.org/mslib/servlet/onepetropreview?id=NACE-94120963

See the link above, you might find that the composition of the nickel form a stonger passive later than the composition of the copper at your specific concentration of HF.

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