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    • 3. 发明授权
    • Twice-anodized aluminum article having an organo-phosphorus monolayer
and process for making the article
    • 具有有机磷单层的两次阳极氧化铝制品及其制造方法
    • US5277788A
    • 1994-01-11
    • US888687
    • 1992-05-22
    • Gary A. NitowskiLarry F. WiesermanKarl Wefers
    • Gary A. NitowskiLarry F. WiesermanKarl Wefers
    • C25D11/12
    • C25D11/12
    • A twice-anodized aluminum substrate is anodized sequentially in first and second aqueous electrolytes. In the first, the substrate is conventionally anodized to produce (i) a porous anodic oxide layer having open pores and a passivation layer thereunder. The substrate, now singly-coated, is then anodized in the second electrolyte of an aqueous solution of an organophosphorus compound which generates a residue which is chemisorbed and covalently bonded to the substrate to form (ii) a monomolecular essentially continuous monolayer on the outer surface of (i), and at the same time, the second anodizing step produces (iii) a barrier layer of non-porous aluminum oxide under (i). The thickness of this barrier layer can be increased as a function of the voltage used while maintaining the thickness of (i) substantially constant, and (ii) protects (i) from dissolution. Depending upon the choice of the organophosphorus compound, a hydrophobic, or chemically resistant surface may be produced; or, a surface which provides a leaving group to be reacted with an appropriate organic coating to be applied after the triplex layer is formed.
    • 在第一和第二水性电解质中依次阳极氧化两次阳极氧化的铝基板。 首先,通常将基板阳极氧化以产生(i)具有开孔的多孔阳极氧化物层和其下的钝化层。 然后将现在单独涂覆的衬底在有机磷化合物的水溶液的第二电解质中阳极氧化,产生残余物,其被化学吸附并共价键合到衬底上以在外表面形成(ii)单分子基本上连续的单层 (i)的同时,并且同时第二阳极氧化步骤在(i)下产生(iii)无孔氧化铝的阻挡层。 可以将所述阻挡层的厚度作为所使用的电压的函数而增加,同时保持(i)的厚度基本上不变,和(ii)保护(i)不溶解。 取决于有机磷化合物的选择,可以产生疏水或耐化学腐蚀的表面; 或者在形成三重层之后提供要与待施加的合适有机涂层反应的离去基团的表面。