Methods and compositions for inhibiting corrosion on metal surfaces
AssigneeChemtreat, Inc.
InventorsRajendra Prasad Kalakodimi, Raymond Post, Douglas A Godwin, James Hatcher
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Abstract
Methods and compositions for inhibiting corrosion of a metal product are provided. The metal product can be contacted with water that includes at least one carbonate and/or bicarbonate salt, or otherwise has components that increase the alkalinity of the water. In addition, or as an alternative, the water can include a stannous corrosion inhibitor. The water can be evaporated off of a surface of the metal product to provide a residual of the salt on the surface and/or a protective stannous film on the surface.
Claims8
A method for inhibiting corrosion of a metal product, the method comprising:
- providing water that has (a) at least one salt dissolved therein, the at least one salt (i) being selected from sodium carbonate, potassium carbonate, sodium bicarbonate, potassium bicarbonate, and combinations thereof, and (ii) being present in an amount corresponding to an alkalinity in a range of 2.5 ppm to 1,500 ppm, and (b) a stannous corrosion inhibitor in an amount of from 0.5 ppm to 1,000 ppm;
- and
- spraying the water onto a surface of the metal,
- wherein the metal is steel and the surface of the metal has a temperature that is sufficiently high to evaporate the water off of the surface so that a film of the stannous corrosion inhibitor and a residual of the at least one salt remain on the surface.
Dependencies are inferred from the claim text.