Novel sulfonium corrosion inhibitors in aqueous acid solutions

Details Novel sulfonium corrosion inhibitors in aqueous acid solutions Novel sulfonium corrosion inhibitors in aqueous acid solutions

1973-08-08

1976-12-07

Weinblatt, Mayer

Compositions

Compositions containing a single chemical reactant or plural...

Organic reactant

252146, 252147, 252394, 252395, C11D 700

Patent

active

039961478

ABSTRACT:
The corrosion of metal surfaces in contact with aqueous acid cleaning solutions is inhibited by sulfonium salt corresponding to the formula ##STR1## wherein n is 1 or 2; R.sub.1 is an electron withdrawing group; R.sub.2 is a hydrocarbyl radical or inertly-substituted hydrocarbyl radical of up to about 24 carbon atoms; R.sub.3 is alkyl of from 1 to 4 carbon atoms, inertly-substituted alkyl of 2-4 carbon atoms, allyl, phenyl or inertly-substituted phenyl; or R.sub.2 and R.sub.3 are joined to form a 5- or 6-membered heterocyclic ring; and A.sup.- is a compatible anion. These sulfonium salts are effective corrosion inhibitors even in the presence of ferric ions.

REFERENCES:
patent: 2078256 (1937-04-01), Leiber et al.
patent: 2396938 (1946-03-01), Bersworth
patent: 3060156 (1962-10-01), Rassweiler et a.
patent: 3419501 (1968-12-01), Levy
patent: 3668137 (1972-06-01), Gardner

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