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Corrosion inhibitors and methods of use

  • US 6,866,797 B1
  • Filed: 08/03/2001
  • Issued: 03/15/2005
  • Est. Priority Date: 08/03/2000
  • Status: Active Grant
First Claim
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1. A composition, comprising:

  • a quaternary ammonium compound of formula (I) embedded imageand a phosphate ester of formula (II);

    embedded imagewherein R1, R2, R3, R4 are independently a hydrocarbyl group;

    X

    is selected from the group consisting of halide and sulfate; and

    R5, R6, and R7 are independently selected from the group consisting of hydrogen, a hydrocarbyl group, and a polyoxyalkylated alcohol; and

    further comprising a thiocarbonyl compound of formula (III) embedded imagewherein R8 is selected from the group consisting of metal ion, ammonium ion, hydrocarbyl, and heterohydrocarbyl;

    X and Y are independently selected from the group consisting of oxygen and sulfur such that at least one of X and Y is sulfur;

    Z is selected from the group consisting of OR9 and NR10R11; and

    R9, R10, and R11 are independently selected from the group consisting of hydrocarbyl and heterohydrocarbyl.

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