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    • 9. 发明授权
    • Immersion plating of silver
    • 银的浸镀
    • US07479305B2
    • 2009-01-20
    • US10521085
    • 2002-09-06
    • Hans-Jürgen SchreierHartmut Mahlkow
    • Hans-Jürgen SchreierHartmut Mahlkow
    • B05D1/18B05D1/36
    • H05K3/244C23C18/42
    • The problem in forming solderable and bondable layers on printed circuit boards is that the surfaces tarnish after storage of the boards prior to further processing (mounting of the electrical components), thus affecting solderability and bondability. In order to overcome this problem it is suggested to deposit, in a first method step, a first metal which is more noble than copper to the printed circuit board and to plate silver in a second method step with the proviso that the first metal be deposited at a rate that is at most half the rate of silver in the second method step when the first metal is silver.
    • 在印刷电路板上形成可焊接和可粘合层的问题是在进一步处理(安装电气部件)之前,表面在储存电路板之后变色,从而影响可焊性和粘合性。 为了克服这个问题,建议在第一种方法步骤中,在第二种方法步骤中,将沉积在铜上的第一种金属沉积到印刷电路板上,并在第二种方法步骤中沉积银,其条件是第一种金属沉积 当第一金属是银时,在第二方法步骤中银的速率最多的一半的速率。