Corrosion-inhibited grease compositions
AssigneeTexaco Inc.
InventorFred T. Crookshank
Life of this patent
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Abstract
Described are lubricating greases corrosion inhibited by a synergistic amount of a mixture of sodium nitrite and N-acyl sarcosines. The greases contain from 75 to 96 parts by weight, preferably 80 to 95 parts by weight of a mineral oil having a SUS viscosity of 50 to 2500 at 100.degree. F thickened to grease consistency with about 3 to 25, preferably 5 to 20, parts by weight of an alkali metal or alkaline earth metal soap or a mixture thereof.
Claims11
A lubricating grease having superior anti-corrosive properties comprising a homogeneous admixture of the following components in their indicated range of proportions:
- a. from about 75 to 96 parts by weight of oil of lubricating viscosity thickened to grease consistency with about 2 to 25 parts by weight of a soap selected from the group consisting of alkali metal soaps, alkaline earth metal soaps and mixtures thereof, and
- b. from about 1.0 to 10.0 parts by weight of a corrosion-inhibiting composition comprising:
- 1. at least one inorganic nitrite,
- 2. at least one N-acyl sarcosine selected from the group consisting of lauroyl sarcosine, cocoyl sarcosine, oleoyl sarcosine, stearoyl sarcosine, fatty acid sarcosines containing from 8 to 22 carbon atoms per molecule and mixtures thereof, the weight ratio of sarcosine to nitrite varying from about 0.05 to 7.5 parts by weight of sarcosine to 0.075 to 7.5 parts of weight of nitrite.
A lubricating sodium soap-based grease comprising a homogeneous admixture of the following components in the indicated proportions:
- a. from about 80 to 95 parts by weight of a mineral oil having a SUS viscosity of 50 to 2500 at 100.degree. F, thickened to grease consistency with about 5 to 20 parts by weight of a sodium soap, and
- b. from about 1 to 20 parts by weight of a corrosion-inhibiting composition comprising
- 1. from about 0.01 to 7.5 parts by weight of sodium nitrite, and
- 2. from about 0.05 to 7.5 parts by weight of cocoyl sarcosine;
- and
- c. about 3 parts by weight of an oxidation inhibitor.
A synergistic corrosion-inhibitor composition which can be incorporated into greases in the proportion of from about 1.0 to 10.0 parts by weight of said inhibitor composition for each 100 parts by weight of finished grease comprising:
- a. from about 0.01 to 9.5 parts by weight of an inorganic nitrite selected from the group consisting of alkali metal nitrites, alkaline earth metal nitrites and mixtures thereof, and
- b. from about 0.05 to 9.5 parts by weight of an N-acyl sarcosine selected from the group consisting of lauroyl sarcosine, cocoyl sarcosine, oleoyl sarcosine, stearoyl sarcosine, fatty acid sarcosines containing from 8 to 22 carbon atoms per molecule and mixtures thereof, the weight ratio of sarcosine to nitrite varying from about 0.05 to 7.5 parts by weight of sarcosine to 0.075 to 7.5 parts by weight of nitrite.
Dependencies are inferred from the claim text.