公开(公告)号：US3886055A

公开(公告)日：1975-05-27

申请号：US42394873

申请日：1973-12-12

Applicant: TEXAS INSTRUMENTS INC

Inventor： BABOIAN ROBERT ,  HAYNES GARDNER S

IPC: C25F5/00 ,  C23B1/00 ,  B01K3/00

CPC classification number: C25F5/00

Abstract: A process for separating silver, gold or a silver/gold alloy from a composite metal body in which the silver, gold or alloy is adhered as an external layer over a ferritic or austenitic stainless steel substrate. Separation is effected by controlled potential electrolysis in which the metal composite serves as the anode and in which the electrolytic solution used contains between about 1% and about 10% by weight of an alkali metal cyanide and up to about 10% by weight of an alkali metal hydroxide. During electrolysis the anode voltage is controlled by reference to a standard electrode at a voltage at which the degree of dissolution of the stainless steel in the half cell comprising stainless steel and the solution is substantially less than the degree of dissolution of the silver, gold or silver/gold alloy in the half cell comprising silver, gold or silver/gold alloy and the solution thereby causing selective removal from the substrate of the silver, gold, or alloy thereof.

Abstract translation: 从银，金或合金的复合金属体中分离出银，金或银/金合金作为外层的铁素体或奥氏体不锈钢基体的方法。 通过控制电位电解进行分离，其中金属复合物用作阳极，并且其中使用的电解液含有约1重量％至约10重量％的碱金属氰化物和至多约10重量％的碱 金属氢氧化物。 在电解期间，通过参照标准电极以不锈钢在不锈钢和溶液的半电池中的溶解程度显着小于银，金等的溶解度的电压来控制阳极电压 银/金合金在半电池中包含银，金或银/金合金，并且该溶液从而导致银，金或其合金的基板的选择性去除。