Method of inhibiting corrosion

• US 4,111,830 A
• Filed: 09/29/1976
• Issued: 09/05/1978
• Est. Priority Date: 09/29/1976
• Status: Expired due to Term

• Current Assignee: Ramon A. Bannister
• Original Assignee: Ramon A. Bannister
• Inventors: Bannister, Ramon A.
• Primary Examiner(s): Padgett, Benjamin R.
• Assistant Examiner(s): Barr, Josephine L.
• Application Number:
  US05/727,416
• Time in Patent Office: 706 Days
• Field of Search: 252/387, 252/388, 21/2.7 R, 21/2.5 R, 176/38
• US Class Current: 422/17
• CPC Class Codes: C23F 11/187 Mixtures of inorganic inhibitors

Abstract

A method of retarding corrosion of metal parts in an aqueous-containing fluid system which comprises, adding to the aqueous-containing fluid system a mixture of a water-soluble cation of mercury and a water-soluble cation of a Group IB or Group IIB metal.

Claims

1. A method of inhibiting corrosion of metals which contact aqueous containing fluids which comprises, adding to the fluid a synergistic mixture of water soluble cations in a corrosion inhibiting amount, said synergistic mixture consisting essentially of a mercuric cation and a metal cation selected from the group consisting of Group IB metals, Group IIB metals, and lead;

and contacting the metal with the corrosion inhibiting fluid.

2. The method according to claim 1 wherein said fluid is an aqueous chloride-ion containing fluid.

3. The method according to claim 2 wherein said water-soluble mercuric ion is a member of the group consisting of mercuric nitrate, mercuric acetate and mercuric cyanide.

4. The method according to claim 3 wherein the concentration of mercuric ion is from 2 parts per million to 5,000 parts per million and the concentration of water-soluble metal cation is from 1 part per million to 50,000 parts per million.

5. The method according to claim 3 wherein said water-soluble metal cation is selected from the group consisting of zinc, cadmium, copper, gold, silver and lead.

6. The method according to claim 1 wherein said metal is selected from the group consisting of stainless steel, carbon steel, iron and aluminum.

7. The method according to claim 3 wherein the concentration of mercuric ion is from 10 ppm. to 1,000 ppm. and the concentration of water-soluble metal cation is from 5 ppm. to 10,000 ppm.