Controlled trivalent chromium pretreatment

    公开(公告)号:US09695523B2

    公开(公告)日:2017-07-04

    申请号:US14052719

    申请日:2013-10-12

    CPC classification number: C25D3/06 C25D5/18 C25D9/04 C25D9/06 C25D21/12

    Abstract: A method for forming a trivalent chromium coating on an aluminum alloy substrate includes adding a chromium-containing solution to a vessel, immersing the aluminum alloy substrate in the chromium-containing solution, immersing a counter electrode in the chromium-containing solution, and applying an electrical potential bias to the aluminum alloy substrate with respect to its equilibrium potential to form a trivalent chromium coating on an outer surface of the aluminum alloy substrate. A method for forming a trivalent chromium coating on a metal substrate includes adding a chromium-containing solution to a vessel, immersing the metal substrate in the chromium-containing solution, immersing a counter electrode in the chromium-containing solution, and modulating an electrical potential difference between the metal substrate and the counter electrode to form a trivalent chromium coating on an outer surface of the metal substrate.

    CONTROLLED TRIVALENT CHROMIUM PRETREATMENT
    5.
    发明申请
    CONTROLLED TRIVALENT CHROMIUM PRETREATMENT 有权
    控制的TRIVALENT铬预处理

    公开(公告)号:US20150101934A1

    公开(公告)日:2015-04-16

    申请号:US14052719

    申请日:2013-10-12

    CPC classification number: C25D3/06 C25D5/18 C25D9/04 C25D9/06 C25D21/12

    Abstract: A method for forming a trivalent chromium coating on an aluminum alloy substrate includes adding a chromium-containing solution to a vessel, immersing the aluminum alloy substrate in the chromium-containing solution, immersing a counter electrode in the chromium-containing solution, and applying an electrical potential bias to the aluminum alloy substrate with respect to its equilibrium potential to form a trivalent chromium coating on an outer surface of the aluminum alloy substrate. A method for forming a trivalent chromium coating on a metal substrate includes adding a chromium-containing solution to a vessel, immersing the metal substrate in the chromium-containing solution, immersing a counter electrode in the chromium-containing solution, and modulating an electrical potential difference between the metal substrate and the counter electrode to form a trivalent chromium coating on an outer surface of the metal substrate.

    Abstract translation: 在铝合金基板上形成三价铬涂层的方法包括向容器中加入含铬溶液,将铝合金基板浸入含铬溶液中,将反电极浸入含铬溶液中, 相对于其平衡电位,在铝合金基板的外表面上形成三价铬涂层的电位偏压。 在金属基材上形成三价铬涂层的方法包括向容器中加入含铬溶液,将金属基材浸入含铬溶液中,将相对电极浸入含铬溶液中,并调制电位 金属基板和对电极之间的差异,以在金属基板的外表面上形成三价铬涂层。

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