METHOD OF INCREASING CORROSION RESISTANCE OF METALS AND ALLOYS BY TREATMENT WITH RARE EARTH ELEMENTS
    9.
    发明授权
    METHOD OF INCREASING CORROSION RESISTANCE OF METALS AND ALLOYS BY TREATMENT WITH RARE EARTH ELEMENTS 失效
    法提高稀土金属和合金的耐腐蚀性与BY ELEMENTS治疗

    公开(公告)号:EP0797691B1

    公开(公告)日:2001-09-12

    申请号:EP95933276.8

    申请日:1995-10-10

    IPC分类号: C23C22/48 C23C22/68

    摘要: There is provided a method for treating the surface of metals such as ferritic steels, austenitic stainless steels, copper and aluminum alloys to increase their corrosion resistance. The metals are immersed into a heated aqueous composition containing a rare earth salt. Increased corrosion resistance is obtained using nitrates of yttrium, gadolinium, cerium, europium, terbium, samarium, neodymium, praseodymium, lanthanum, holmium, ytterbium, dysprosium, and erbium nitrates. The rare earth salt is present in the range from about 2% by weight to saturation of the solution. The composition includes a pH-modifying substance such as nitric acid to adjust the pH in the range 0.5 to about 6.5 to attack the surface to remove oxides facilitating deposition of the rare earth. For aluminum alloys the pH is maintained between 4.5 to 6.5, for nickel based alloys and austenitic stainless steels the pH is maintained between 0.5 to 3.5 and between pH 2.0 to 4.5 for ferritic stainless steels. The surface can also be conditioned by abrasion before or during immersion in the composition. Increased corrosion resistance is achieved by immersion for 15 to 20 minutes with the composition maintained between 60 to 95 DEG C. Gadolinium, neodymium and praseodymium nitrate when used alone produced the greatest degree of corrosion resistance compared to the other rare earth nitrates. Significant synergistic effects are observed when combinations of two or more rare earth nitrates are used in the compositions. Compositions based on cerium nitrate, gadolinium nitrate and lanthanum nitrate are very effective in reducing crevice corrosion.

    RUBBER TO METAL BONDING BY SILANE COUPLING AGENTS
    10.
    发明公开
    RUBBER TO METAL BONDING BY SILANE COUPLING AGENTS 审中-公开
    橡胶对金属的责任硅烷偶联剂

    公开(公告)号:EP1032616A1

    公开(公告)日:2000-09-06

    申请号:EP98955101.5

    申请日:1998-10-23

    IPC分类号: C09J5/04

    摘要: Adhesion of rubber to a variety of metals (aluminum, stainless steel, mild steel and brass) is effectively achieved by the application of an organofunctional silane (I) and a non-organofunctional silane (II) to the requisite surface. Preferably, the organofunctional silane (I) is a vinyltrialkoxysilane with the non-organofunctional silane (II) preferably comprising an alkoxylated substituted alkyl silane. The silanes (I) and (II) are at least partially hydrolyzed and are normally provided in the form of a EtOH/H2O solution. Bonded joints formed by these adhesive treatments can withstand fuel degradation tests indicating that the treatments can be used, for example, to bond metal and rubber surfaces in automotive and other environments in which the joined parts will be contacted by fuels, oil and/or organic solvents.