Use of a triazole compound as an additive for improving the anti-corrosion properties of a lubricant composition for a propulsion system of an electric or hybrid vehicle
AssigneeTotalenergies Onetech
InventorsShimin Zhang, Hakim El-Bahi, Julien Guérin
Life of this patent
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Abstract
The invention relates to the use of at least one triazole compound as an additive for improving the anti-corrosion properties of a lubricant composition for a propulsion system of an electric or hybrid vehicle, said lubricant composition comprising one or more amino and/or sulfur anti-wear additives. The invention also relates to the use of a lubricant composition for lubricating a propulsion system of an electric or hybrid vehicle.
Claims12
A method for improving the anti-corrosion properties of a lubricant composition for a propulsion system of an electric or hybrid vehicle, comprising:
- adding at least one triazole compound to a lubricant composition for lubricating the propulsion system, the lubricant composition comprising from 0.5% to 2% by mass, relative to the total mass of the lubricant composition, of at least one anti-wear additive chosen from polysulfide additives, amine phosphates, phospho-sulfur additives, sulfur-based olefins, alkylthiophosphates, dimercaptothiadiazole derivatives, 2,5-dimercapto-1,3,4-thiadiazole derivatives, or mixtures of two or more thereof,
- wherein the 2,5-dimercapto-1,3,4-thiadiazole derivatives are chosen from compounds having the following formulae:
- wherein:
- each R1 group is independently selected from a hydrogen atom, a linear or branched alkyl or alkenyl group comprising from 2 to 18 carbon atoms, or an aromatic substituent;
- and
- each n is independently selected from 1, 2, 3, or 4, and
- wherein the at least one triazole compound is a tolyltriazole derivative represented by the following formula:
- wherein:
- R4 and R5 are independently selected from a hydrogen atom or a branched C6 to C12 alkyl group;
- and
- -A- represents a methylene group (—CH2—) group.
A method of reducing corrosion in a propulsion system of an electric or hybrid vehicle, comprising lubricating an electric motor and/or power electronics of the electric or hybrid vehicle with a lubricant composition comprising:
- an anti-corrosion additive comprising at least one triazole compound;
- and
- from 0.5% to 2% by mass, relative to the total mass of the lubricant composition, of at least one anti-wear additive chosen from polysulfide additives, amine phosphates, phospho-sulfur additives, sulfur-based olefins, alkylthiophosphates, dimercaptothiadiazole derivatives, 2,5-dimercapto-1,3,4-thiadiazole derivatives, or mixtures of two or more thereof,
- wherein the 2,5-dimercapto-1,3,4-thiadiazole derivatives are chosen from compounds having the following formulae:
- wherein:
- each R1 group is independently selected from a hydrogen atom, a linear or branched alkyl or alkenyl group comprising from 2 to 18 carbon atoms, or an aromatic substituent;
- and
- each n is independently selected from 1, 2, 3, or 4, and
- wherein the at least one triazole compound is a tolyltriazole derivative represented by the following formula:
- wherein:
- R4 and R5 are independently selected from a hydrogen atom or a branched C6 to C12 alkyl group;
- and
- -A- represents a methylene group (—CH2—) group.
Dependencies are inferred from the claim text.