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topic 0443

Amine based inhibitors for acid pickling

A discussion started in 1996 and continuing through 2003.
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I am interested whether experience exists relative to the use of organic amine based acid inhibitors in HCl pickling baths used in electrogalvanizing operations. In particular, I am interested in whether use of such inhibitors in the pickling bath would create problems with adhesion or other deleterious surface problems. The concentration of inhibitor would be ~0.06% (wt) in the HCl pickling bath used for activation of the surface just prior to plating.

Durant Worthy
LTV Steel


Kindly provide the list of chemicals which are used for picking bath process.

Ketumin Jayantbhai Joshi
research student - Kasturinagar, Dist: Gandhinagar, India


Durant: Proprietaries like Henkel's Rodine series, or Stannine, or Parkin are used in acid pickling of steel. letter 7046 gives some general ideas about the basis of these inhibitors. The acid activation step immediately before electroplating is not really an acid pickling step, although platers sometimes call it that. I don't think inhibitors are needed or appropriate for these mild acid activation processes, and I suspect that your implication that they could cause plating problems is correct.

Ketumin: Hot sulphuric acid or cold hydrochloric acid plus inhibitors would be the most common for steel; nitric plus hydrofluoric would be common for stainless steel. Please try to rephrase your question a bit less abstractly, Ketumin, and I'll try to help!

Ted Mooney, Teds signature
Ted Mooney, P.E.
Pine Beach, New Jersey

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