[Alcoa.com] The brightness of the zincate zinc coating is slightly lower than that of the zinc chloride coating, which is caused by the poor adhesion of the zincate coating. However, it is caused by the following five conditions.
(1) Excessive additive addition. The brightness of the zincate zincate layer is slightly inferior to that of the potassium chloride zinc plating layer, and some people think that it can be compensated by adding more brighteners. As a result, the plating layer not only fails to achieve the intended purpose, and the binding force of the plating layer is also seriously affected.
The solution is: dilute, adjust the composition of the solution; usually less, harder.
(2) The workpiece stays in the plating tank for too long before plating. Some people think that zincate zinc plating solution is alkaline, the pre-processed workpiece hung in the plating tank, until after enough for a trough to send power plating, so that the workpiece is easy to produce passivation, thus affecting the binding force of the coating .
The solution is: to avoid the workpiece stay in the tank too long.
(3) The coating is too thick. If the plating is too thick, the internal stress and brittleness of the coating increase, and the coating on the edge of the workpiece appears air bubbles and peels.
The solution is: plating thickness should be controlled within 20um.
(4) The surface of the bath floats with oil. After the workpiece enters the groove, it is surrounded by oil stains on the surface of the bath and dirt composed of decomposition products of brighteners. This causes the plating to peel off.
The solution is: this layer of slick oil should be removed at any time with a thick layer of toilet paper, after the workpiece into the tank in the bath first shaking a few, so that the adsorption of oil on the surface of the workpiece off.
(5) The degreasing of the workpiece is not complete. Some people think that zincate zinc plating is alkaline, there must be degreasing ability, pre-treatment can be sloppy. Although the bath is alkaline, when the oily workpiece enters the bath, zinc ions predischarge before the alkaline work, and the zinc layer deposits on the thin oil film, reducing the bonding force.
The solution is: to strengthen the pre-treatment process.
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