Corrosion preventive composition
AssigneeCastrol Industrial Inc.
InventorsJohn A. Cutcher, Gary M. Andrews
Life of this patent
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Abstract
The present invention is, in one form, an aqueous alkaline metalworking fluid composition in the form of a concentrate which includes a salt of orthophosphoric acid; a dibasicdioic acid in an amount of up to about 5.0% by weight of the concentrate; an essentially phosphonate-free chelating agent; and, a neutralizing base. The composition may also include a lubricating agent, a coupling agent, a passavating agent, a biocide, and a colorant.
Claims58
An aqueous alkaline metalworking fluid composition in the form of a concentrate comprising:
- a salt of orthophosphoric acid;
- a dibasicdioic acid in an amount of up to about 5.0% by weight of the concentrate;
- a chelating agent;
- and,
- a neutralizing base,
- said composition being essentially free of phosphates.
An aqueous alkaline metalworking fluid composition comprising, by weight,
- from about 0.03% up to about 1.0% of a salt of orthophosphoric acid;
- from about 0.02% up to about to 0.2% of a dibasicdioic acid;
- from about 0.03% up to about to 0.5% of a chelating agent;
- and,
- from about 0.15% up to about to 4.0% of a neutralizing base,
- said composition being essentially free of phosphates.
A method of preventing corrosion of ferrous metals during metalworking operations comprising the step of utilizing as a metalworking fluid an aqueous alkaline composition comprising a salt of orthophosphoric acid, a dibasicdioic acid in an amount of from about 0.02% up to about 0.2% by weight of the fluid, a chelating agent, and a neutralizing base, said composition being essentially free of phosphonates.
Dependencies are inferred from the claim text.