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    • 4. 发明公开
    • Electroless deposition magnetic recording media process
    • 一种用于通过化学沉积生产磁性记录介质的过程。
    • EP0237663A1
    • 1987-09-23
    • EP86301984.0
    • 1986-03-18
    • RICHARDSON CHEMICAL COMPANY
    • Malik, MichaelGreene, Joseph L.
    • G11B5/858C23C18/36
    • G11B5/64G11B5/858
    • A process for producing a high density magnetic storage device such as a rigid memory disc with
      high coercivity, high remanence and
      hysteresis loop squareness. The device is prepared by initially cleaning the surface of a substrate, such as an aluminum disc, zincating that cleaned surface, when applicable electrolessly depositing a non-magnetic, nickel-phosphorus layer thereon which is substantially free of pits and other surface imperfections and which has a nickel content of from approximately 88 to 92 percent and a phosph­orus content of from 12 to 8 percent, by weight. The non-magnetic, nickel-phosphorus layer is then polished and a magnetic, cobalt-phosphorus layer electrolessly deposited thereon. The cobalt-­phosphorus deposition is performed in a highly stable, ammonia-free bath containing a source of cobalt ions, a source of hypophosphite ions, a source of citrate ions, and a low molecular weight, bath soluble amino acid. Preferably, a buffering agent such as, for example, a borate is employed in the bath. Thereafter, if desired, a protective coating in the form of a fluorocarbon, graphite or an electroless nickel-boron layer may be applied as an overlayer to the cobalt-phosphorus layer.
    • 7. 发明公开
    • Electroless nickel plating
    • Chemische Vernickelung。
    • EP0071436A1
    • 1983-02-09
    • EP82303913.6
    • 1982-07-23
    • RICHARDSON CHEMICAL COMPANY
    • Mallory, Glenn O.Parker, Konrad
    • C23C18/32
    • C23C18/36
    • Nickel-phosphorus deposits are electrolessly coated onto substrates at a commercially acceptable rate of deposition in a manner that enhances corrosion resistance and reduces the internal tensile stress of the electroless deposit on the substrate. This is done by plating from a bath that is sulfur-free (or free of sulfur except at its highest oxidation state) and that includes an unsaturated carboxylic acid of the formula R(COOH) n wherein R is an unsaturated alkyl group of at least 2 carbon atoms and n is at least 1, or a derivative thereof. Such compounds include aconitic, citraconic, fumaric, itaconic and maleic acids. The reducing agent of the bath may also be its phosphorus source e.g. an alkali metal hypophosphite.
    • 镍磷沉积物以商业上可接受的沉积速率无电涂覆在基材上,以提高耐腐蚀性并降低基材上无电解沉积物的内部拉伸应力。 这是通过从不含硫的浴(或除了最高的氧化态除外)除去的浴进行电镀,其包括式R(COOH)n的不饱和羧酸,其中R是至少不饱和烷基 2个碳原子,n至少为1,或其衍生物。 这些化合物包括乌头酸,柠康酸,富马酸,衣康酸和马来酸。 浴的还原剂也可以是其磷源,例如, 碱金属次磷酸盐。