SYSTEMS AND METHOD FOR TREATING A SUBSTRATE
    1.
    发明申请

    公开(公告)号:WO2023015060A1

    公开(公告)日:2023-02-09

    申请号:PCT/US2022/072721

    申请日:2022-06-02

    Abstract: Disclosed herein is a pretreatment composition comprising a Group IVB metal in an amount of 200 ppm to 5,000 ppm based on total weight of the pretreatment composition, total fluoride in an amount of 1,000 ppm to 25,000 ppm based on total weight of the pretreatment composition and an electropositive metal. Also disclosed herein is a pretreatment composition comprising a Group IVB metal in an amount greater than 500 ppm based on total weight of the pretreatment composition and free fluoride in an amount of 50 ppm to 750 ppm based on total weight of the pretreatment composition, wherein the pretreatment composition has a pH greater than 4. Also disclosed herein are systems and methods for treating a substrate. Also disclosed herein are treated substrates.

    SYSTEMS AND METHODS FOR TREATING A METAL SUBSTRATE

    公开(公告)号:WO2021071575A1

    公开(公告)日:2021-04-15

    申请号:PCT/US2020/045656

    申请日:2020-08-10

    Abstract: Disclosed herein are systems and methods for treating a magnesium or a magnesium alloy substrate. The system includes a cleaning composition having a pH greater than 8.5 or a solvent, and a pretreatment composition comprising an organophosphate compound and/or an organophosphonate compound. The method includes contacting a substrate surface with the cleaning composition or the solvent, and contacting the surface with the pretreatment composition. Also disclosed are substrates treated with one of the systems or methods. Also disclosed are magnesium or magnesium alloy substrates wherein, between the air/substrate interface and 500nm below the air/substrate interface (a) oxygen and magnesium are present in a combined amount of at least 70 atomic %; (b) carbon is present in an amount of no more than 30 atomic %; and/or (c) fluoride is present in an amount of no more than 8 atomic %, wherein atomic % is measured by XPS depth profiling.

    SYSTEMS AND METHODS FOR MAINTAINING PRETREATMENT BATHS

    公开(公告)号:WO2020214592A1

    公开(公告)日:2020-10-22

    申请号:PCT/US2020/028115

    申请日:2020-04-14

    Abstract: Disclosed is a system for maintaining a pretreatment bath containing a pretreatment comprising a Group IVB metal. The system comprises an aqueous reducing agent comprising a metal cation and a latent source of sulfate which, upon reaction with a contaminant in the pretreatment bath, forms a metal sulfate. The contaminant comprises a nitrite source. The metal sulfate salt has a pKsp of 4.5 to 11 at a temperature of 25°C. Also disclosed is a method for maintaining a pretreatment bath containing a pretreatment composition comprising a Group IVB metal. The method comprises supplying the reducing agent to the pretreatment bath in an amount sufficient to reduce a pollution ratio of the pretreatment bath to less than 1:1. Also disclosed are substrates with a pretreatment bath maintained according to the system and method.

    ALTERNATIVE ZUSAMMENSETZUNG UND ALTERNATIVES VERFAHREN ZUR EFFEKTIVEN PHOSPHATIERUNG VON METALLISCHEN OBERFLÄCHEN

    公开(公告)号:WO2020156913A1

    公开(公告)日:2020-08-06

    申请号:PCT/EP2020/051585

    申请日:2020-01-23

    Applicant: CHEMETALL GMBH

    Abstract: Die vorliegende Erfindung betrifft eine alternative saure, wässrige Zusammensetzung zur effektiven Phosphatierung von metallischen Oberflächen, die neben Zinkionen, Manganionen, Phosphationen sowie vorzugsweise Nickelionen mindestens einen Beschleuniger der Formel R 1 R 2 R 3 C-NO 2 umfasst, wobei jeder der Substituenten R 1 , R 2 und R 3 am C-Atom unabhängig von den anderen ausgewählt ist aus der Gruppe bestehend aus Hydroxymethyl, 1-Hydroxyethyl, 2-Hydroxyethyl, 1-Hydroxypropyl, 2- Hydroxypropyl, 3-Hydroxypropyl, 1 -Hydroxy-1 -methylethyl und 2-Hydroxy-1 - methylethyl. Zudem bezieht sich die Erfindung auf ein Verfahren zur Herstellung einer solchen Zusammensetzung, ein alternatives Verfahren zur Phosphatierung von metallischen Oberflächen sowie die Verwendung hiermit hergestellter Phosphatbeschichtungen.

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