Dyed trivalent chromium conversion coatings and methods of using same

    公开(公告)号:US10533254B2

    公开(公告)日:2020-01-14

    申请号:US15885528

    申请日:2018-01-31

    IPC分类号: C23C22/30 C23C22/08

    摘要: An aqueous conversion coating solution comprises a trivalent chromium compound, a zirconate compound, and a dye compound. The trivalent chromium compound can comprise trivalent chromium compounds such as trivalent chromium sulfate. The dye compound can comprise an azo dye, a chromium complex dye, an anthraquinoid dye, and/or a methine dye. The zirconate compound can comprise alkali metal hexafluorozirconate compounds. The conversion coating solution can comprise a phosphorous compound such as an organic amino-phosphonic acid compound. The conversion coating solution can be formed by mixing a dye additive containing the dye with a trivalent chromium conversion coating solution that does not contain a dye. The conversion coating solution can be used to treat metal substrates comprising aluminum, magnesium, and/or zinc.

    Electropolishing method and product

    公开(公告)号:US10557212B2

    公开(公告)日:2020-02-11

    申请号:US15453784

    申请日:2017-03-08

    发明人: Alp Manavbasi

    IPC分类号: C25F3/20

    摘要: A method for electropolishing a metal substrate comprises submerging at least part of the metal substrate in an electrolyte solution and applying electrical current to the metal substrate to form an electrical circuit where the metal substrate is the anode. The electrolyte solution comprises phosphoric acid and at least one acrylic monomer and/or acrylic polymer.

    pH stable trivalent chromium coating solutions

    公开(公告)号:US10400338B2

    公开(公告)日:2019-09-03

    申请号:US15978980

    申请日:2018-05-14

    IPC分类号: C23C22/34 C23C22/00

    摘要: A stable trivalent chromium coating solution can be prepared by heating the chromium coating solution and adjusting the pH of the chromium coating solution. The coating solution can be heated to at least 35° C. for no more than 24 hours. While the solution is hot, a basic or acidic material can be added to increase or reduce the pH to a target value, respectively. In some embodiments, the chromium coating solution can have a pH of 3.5 to 4.0 and the pH can vary no more than ±0.15 while in storage for at least 20 days. The trivalent chromium coating solution can include a fluoride compound, a zirconate compound, a corrosion inhibitor compound, a chelating agent, a phosphorous compound, and/or other compounds.

    DYED TRIVALENT CHROMIUM CONVERSION COATINGS AND METHODS OF USING SAME

    公开(公告)号:US20180216234A1

    公开(公告)日:2018-08-02

    申请号:US15885528

    申请日:2018-01-31

    IPC分类号: C23C22/08

    摘要: An aqueous conversion coating solution comprises a trivalent chromium compound, a zirconate compound, and a dye compound. The trivalent chromium compound can comprise trivalent chromium compounds such as trivalent chromium sulfate. The dye compound can comprise an azo dye, a chromium complex dye, an anthraquinoid dye, and/or a methine dye. The zirconate compound can comprise alkali metal hexafluorozirconate compounds. The conversion coating solution can comprise a phosphorous compound such as an organic amino-phosphonic acid compound. The conversion coating solution can be formed by mixing a dye additive containing the dye with a trivalent chromium conversion coating solution that does not contain a dye. The conversion coating solution can be used to treat metal substrates comprising aluminum, magnesium, and/or zinc.

    pH Stable Trivalent Chromium Coating Solutions

    公开(公告)号:US20190382902A1

    公开(公告)日:2019-12-19

    申请号:US16552996

    申请日:2019-08-27

    IPC分类号: C23C22/34

    摘要: A stable trivalent chromium coating solution can be prepared by heating the chromium coating solution and adjusting the pH of the chromium coating solution. The coating solution can be heated to at least 35° C. for no more than 24 hours. While the solution is hot, a basic or acidic material can be added to increase or reduce the pH to a target value, respectively. In some embodiments, the chromium coating solution can have a pH of 3.5 to 4.0 and the pH can vary no more than ±0.15 while in storage for at least 20 days. The trivalent chromium coating solution can include a fluoride compound, a zirconate compound, a corrosion inhibitor compound, a chelating agent, a phosphorous compound, and/or other compounds.