Hanging tools for electroplating alloys: hanging tools for bearing bush electroplating lead-antimony-tin alloys

2021-09-26

First, the bearing bush is assembled into a cylindrical shape in a special hanger, as shown in Figure 2. The lower part of the bearing shell cylinder rests on the hard rubber frame, the anode is installed in the center, and the anode is fixed in the center with a hard rubber plate from above. A steel sleeve is placed on the outside of the bearing shell cylinder. This steel sleeve is used to fix the bearing shell and also to guide the current to the bearing shell. A hanger composed of two semi-cylinders is also used, and the bearing bush is also placed in the hanger, and then the two semi-cylinders are hung on an anode and placed in the plating tank. Installation of such a hanger is relatively simple.

During electroplating, the hanger and the bearing pads are kept in the tank for 3 to 4 minutes. These bearing pads are used as cathodes, and the steel rods installed on the hangers as described above are used as anodes.

In order to reveal the metal structure, etching is carried out in a 7% to 10% sulfuric acid solution for 30 to 40s. Before electroplating, lead anodes containing 12% antimony and 6% tin were mounted on the hanger. Electroplating lead-antimony-tin alloys is carried out in the bath of the following composition: lead carbonate ll0 ~ 115g/L, hydrofluoric acid (50%) 240g/L, boric acid 106g/L, antimony l. 5～3g/L, tin l0～14g/L, glue 0.2g/L.

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