Problems needing attention in silver plating of alloy aluminium plate
Dong Xing
aluminummanufacturerchina.com
2017-10-09 17:21:16
By using the method of zinc can better solve the problem of the aluminum alloy bonding force between the coating and the substrate metal, zinc is more negative potentials using aluminum, easy principle in electrolyte replacement, the replacement of a thin layer of zinc layer. Summed up the alloy aluminum alloy aluminum and its alloy manufacturers in silver plating process also, pay attention to the following points:
1, whether it is degreasing or alkali washing, NaOH content should not be too high, and the time should not be too long, so as to avoid surface corrosion. Harbin Dong Xing Aluminum Co., Ltd is a competent and reliable Aluminum board supplier.
2, this process is the key of zinc can obtain satisfactory coating. Zinc dipping to two, because the first dip zinc, zinc layer is rough. With 1:1 HN0, its removal after second times leaching zinc, second zinc, only zinc layer is uniform and compact with the substrate, with good adhesion, can enter the next procedure.
3, zinc immersion process should pay attention to swing, prevent parts overlap with each other, resulting in a local zinc free layer. Harbin Dong Xing Aluminum Co., Ltd could provide you with Aluminum marine sheet.
4, if found that the quality of zinc leaching is not good, with 1:1 HN0, after the retreat, and then re dip zinc.
5, galvanized parts charged people to enter a groove of copper cyanide solution, and with a large current shock after 2min plating, and then returned to normal current. If found in the plating parts surface black, dark hair, can be removed parts after processing electroplating.
6, after the aluminum plate copper plating, may press the copper piece silver plating the normal working procedure to carry on.
1, whether it is degreasing or alkali washing, NaOH content should not be too high, and the time should not be too long, so as to avoid surface corrosion. Harbin Dong Xing Aluminum Co., Ltd is a competent and reliable Aluminum board supplier.
2, this process is the key of zinc can obtain satisfactory coating. Zinc dipping to two, because the first dip zinc, zinc layer is rough. With 1:1 HN0, its removal after second times leaching zinc, second zinc, only zinc layer is uniform and compact with the substrate, with good adhesion, can enter the next procedure.
3, zinc immersion process should pay attention to swing, prevent parts overlap with each other, resulting in a local zinc free layer. Harbin Dong Xing Aluminum Co., Ltd could provide you with Aluminum marine sheet.
4, if found that the quality of zinc leaching is not good, with 1:1 HN0, after the retreat, and then re dip zinc.
5, galvanized parts charged people to enter a groove of copper cyanide solution, and with a large current shock after 2min plating, and then returned to normal current. If found in the plating parts surface black, dark hair, can be removed parts after processing electroplating.
6, after the aluminum plate copper plating, may press the copper piece silver plating the normal working procedure to carry on.
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