Electrodeposition of molybdenum disulfide dry film lubricant coatings
AssigneeGM Global Technology Operations LLC
InventorsAdam Paul Rabe, Jacob Alexander Rabe, Matthew G. Keast, Zhe Li
Life of this patent
Estimating the term…
Abstract
A method of forming a lubricant coating, a method of coating a bearing surface with a lubricant coating, and a vehicle including a bearing including a lubricant coating. A substrate, such as a bearing, including a surface and an electrode are immersed in an electrolyte bath. The electrolyte bath includes an aqueous electrolyte solution including sodium metabisulfite (Na2S2O5), sodium molybdate (Na2MoO4·2H2O), a pH modifier, an anionic surfactant, and water. A first pulsed direct current is applied through the aqueous electrolyte solution using a direct current power supply and a molybdenum disulfide (MoS2) layer is formed on the surface of the substrate.
Claims20
A method of forming a lubricant coating, comprising:
- immersing a substrate including a surface and an electrode in an electrolyte bath, wherein the electrolyte bath includes an aqueous electrolyte solution including sodium metabisulfite (Na2S2O5), sodium molybdate (Na2MoO4·2H2O), a pH modifier, an anionic surfactant, and water;
- applying a first pulsed direct current through the aqueous electrolyte solution using a direct current power supply, wherein the polarity of the first pulsed direct current causes the substrate to provide an anode and the electrode to provide a cathode;
- and
- forming a molybdenum disulfide (MoS2) layer on the surface of the substrate.
A method of coating a bearing surface with a lubricant coating, comprising:
- immersing a bearing including a surface and an electrode in an electrolyte bath, wherein the electrolyte bath includes an aqueous electrolyte solution including sodium metabisulfite (Na2S2O5), sodium molybdate (Na2MoO4·2H2O), a pH modifier, an anionic surfactant, and water;
- applying a first pulsed direct current through the aqueous electrolyte solution using a direct current power supply, wherein the polarity of the current causes the bearing to provide an anode and the electrode to provide a cathode;
- and
- forming a molybdenum disulfide (MoS2) layer on the surface of the bearing.
A method of forming a lubricant coating, comprising:
- preparing an aqueous electrolyte solution by combining a sodium metabisulfite (Na2S2O5) present in the range of 5 and 15 percent by weight of the total weight of the aqueous electrolyte solution, a sodium molybdate (Na2MoO4·2H2O) present in the range of 3 percent and 10 percent by weight of the total weight of the aqueous electrolyte solution, citric acid present in the range of 1 percent and 3 percent by weight of the total weight of the aqueous electrolyte solution, an anionic surfactant present in the range of 5 percent and 15 percent by weight of the total weight of the solution, and water present in the range of 66 percent by weight to 80 percent by weight of the total weight of the solution, wherein the total weight of the solution is 100 percent weight;
- immersing a substrate including a surface and an electrode in an electrolyte bath, including the aqueous electrolyte solution, wherein the electrode is an inert electrode material;
- applying a first pulsed direct current through the aqueous electrolyte solution using a direct current power supply, wherein the polarity of the first pulsed direct current causes the substrate to provide an anode and the electrode to provide a cathode;
- and
- forming a molybdenum disulfide (MoS2) layer on the surface of the substrate.
Dependencies are inferred from the claim text.