# US 2020/0399773 A1 · Wear-resistant coating > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2020/0399773 A1 - Document ID: US20200399773A1 - Status: Published application - Kind: A1 - Application number: 16/447,302 - Filed: 2019-06-20 - Published: 2020-12-24 - Earliest claimed: 2019-06-20 - Assignees: Hamilton Sundstrand Corporation - Applicants: Hamilton Sundstrand Corporation - Inventors: Blair A. Smith; Claude J. Moreau - Web page: https://patentgrep.com/patent/US20200399773A1 ## CPC - C25D 3/06: from solutions of trivalent chromium - B05D 7/14: to metal, e.g. car bodies (involving a chemical reaction between the metal and the coating C23) - C25D 5/34: Pretreatment of metallic surfaces to be electroplated - C25D 5/50: by heat-treatment - C25D 5/54: Electroplating of non-metallic surfaces (C25D7/12 takes precedence) - B05D 2504/00: Epoxy polymers - B05D 2505/50: Polyimides - B05D 2506/10: Fluorinated polymers - B05D 2601/00: Inorganic fillers - C25D: PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR - B05D: PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (conveying articles or workpieces through baths of liquid B65G, e.g. B65G49/02) ## Abstract A method of forming a wear-resistant coating on an article includes depositing a chromium coating on a substrate of the article, and subsequently heating the coated article to enhance a plurality of through-cracks within the chromium coating. The method further includes applying a liquid filler material to the coated article such that at least one of the plurality of through-cracks is at least partially occupied by the filler material, and solidifying the liquid filler material ## Claims ### Claim 1 A method of forming a wear-resistant coating on an article, the method comprising: depositing a chromium coating on a substrate of the article; heating the coated article to enhance a plurality of through-cracks within the chromium coating; applying a liquid filler material to the coated article such that at least one of the plurality of through-cracks is at least partially occupied by the filler material, the liquid filler material comprising a polymer material and a corrosion-inhibiting zinc or aluminum material; and solidifying the liquid filler material. ### Claim 2 (depends on 1) The method of claim 1, wherein the chromium coating is electrodeposited from a trivalent chromium electrolyte. ### Claim 3 (depends on 1) The method of claim 1, wherein the heating step is performed at a temperature ranging from about 205° F. to about 800° F. ### Claim 4 (depends on 1) The method of claim 1, wherein the polymer material of the liquid filler material is selected from the group consisting of fluoropolymers, epoxy resins, polyimide resins, epoxy-based film lubricants, phenolic-based film lubricants, and combinations thereof. ### Claim 5 (depends on 4) The method of claim 4, wherein the filler material further comprises particulate materials selected from the group consisting of silicon carbide, boron nitride, chromium carbide, tungsten carbide, diamond, and combinations thereof. ### Claim 6 (depends on 1) The method of claim 1, wherein applying the filler material comprises a spraying painting, filming, or dip-coating technique. ### Claim 7 (depends on 1) The method of claim 1 and further comprising: machining the coated article prior to applying the material. ### Claim 8 (depends on 1) The method of claim 1, wherein the solidifying step comprises curing the filler material using heat, chemical additives, or an electron beam. ### Claim 9 (depends on 1) The method of claim 1, wherein each of the plurality of through-cracks is at least partially occupied by the filler material. ### Claim 10 A coated article comprising: a substrate; a wear-resistant coating in communication with the substrate, the wear-resistant coating comprising: a chromium coating deposited on the substrate, the chromium coating comprising a plurality of through-cracks; and a solidified filler material in communication with the chromium coating and at least partially occupying at least one of the plurality of through-cracks; wherein the solidified filler material comprises a polymer material and a corrosion-inhibiting zinc or aluminum material. ### Claim 11 (depends on 10) The article of claim 10, wherein the substrate is formed from one of a metallic, plastic, and ceramic material. ### Claim 12 (depends on 10) The article of claim 10, wherein the chromium coating is electrodeposited from a trivalent chromium electrolyte. ### Claim 13 (depends on 10) The article of claim 10, wherein the polymer material of the solidified filler material is selected from the group consisting of fluoropolymers, epoxy resins, polyimide resins, epoxy-based film lubricants, phenolic-based film lubricants, and combinations thereof. ### Claim 14 (depends on 13) The article of claim 13, wherein the solidified filler material further comprises particulate materials selected from the group consisting of silicon carbide, boron nitride, chromium carbide, tungsten carbide, diamond, and combinations thereof. ### Claim 15 (depends on 14) The article of claim 14, wherein the at least one of the plurality of through-cracks extends through the chromium coating to the substrate, and wherein the solidified filler material within the at least one of the plurality of through-cracks is in communication with the substrate. ### Claim 16 (depends on 10) The article of claim 10, wherein the solidified filler material at least partially occupies the plurality of through-cracks. ### Claim 17 (depends on 10) The article of claim 10, wherein the wear-resistant coating has a thickness ranging from about 2 microns to about 250 microns. ### Claim 18 (depends on 10) The article of claim 10, wherein the wear-resistant coating has a thickness exceeding 250 microns. ### Claim 19 (depends on 10) The article of claim 10, wherein the wear-resistant coating is suitable for use in a hydraulic system. ### Claim 20 (depends on 10) The article of claim 10, wherein the wear-resistant coating is suitable for use in operating temperatures of up to 600° F.