公开(公告)号：US20250027223A1

公开(公告)日：2025-01-23

申请号：US18354298

申请日：2023-07-18

Applicant: GM Global Technology Operations LLC

Inventor： Adam Paul Rabe ,  Jacob Alexander Rabe ,  Matthew G. Keast ,  Zhe Li

IPC: C25D9/06 ,  C25D7/10 ,  C25D21/12

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.

公开(公告)号：US20240301560A1

公开(公告)日：2024-09-12

申请号：US18175261

申请日：2023-02-27

Applicant: GM Global Technology Operations LLC

Inventor： Adam Paul Rabe ,  Zhe Li ,  Matthew George Keast ,  Jacob Alexander Rabe

IPC: C23C22/50 ,  C23C22/78

CPC classification number: C23C22/50 ,  C23C22/78

Abstract: A method of coating an automotive part for an electric drive unit is provided. The method comprises providing a part comprising a body having an outer surface and introducing the part in an aqueous coating solution comprising sodium metabisulfite and citric acid to form residual oxides on the outer surface defining a sample-water interface. The method further comprises emitting ultrasonic waves in the coating solution to generate acoustic cavitation activity at the sample-water interface and continuously form oxygen and hydrogen species. The citric acid arranged to activate the outer surface to allow for the reaction with the oxygen and hydrogen species forming iron hydroxide. The sodium metabisulfite arranged to react with the iron hydroxide generating iron oxysulfide such that the iron oxysulfide reacts with the oxygen and hydrogen species to produce iron oxide and iron sulfide on the outer surface defining a black oxide coating.