Patent ID: 6540943
Filing Date: 2003-04-01
Classification: C23F,C23G,Y10S

Abstract:
A method of inhibiting corrosion of metal equipment which is cleaned with an inorganic acid comprising the step of treating the equipment with an effective amount of a corrosion inhibitor composition admixed with the inorganic acid, the corrosion inhibitor composition comprising:a. at least one quaternary ammonium compound, b. a sulfur-containing compound and c. a nonionic surfactant in a solvent wherein the corrosion inhibitor composition comprises from about 40 to about 50 weight percent of the quaternary ammonium compound, from about 2 to about 10 weight percent of the sulfur-containing compound, from about 10 to about 15 weight percent of the nonionic surfactant and from about 20 to about 30 weight percent of the solvent.