We are using trivalent chromium colored zinc passivation solution for a long time, and the corrosion resistance of the workpiece is poor. The salt spray test always fails to meet the customer's requirements. What should we do?
Based on on-site experience and product characteristics, Bigely Technology has conducted the following analysis:
1.Poor galvanized layer results in poor corrosion resistance after passivation. The galvanizing tank should be adjusted to improve the quality of the galvanized layer and enhance its corrosion resistance.
2.The aging of the workpiece is not thorough. The process of baking and aging of workpieces should be strengthened to improve the quality of aging.
3.There are many impurities in the passivation tank. The passivation tank should be aged in a timely manner.
4.The passivation film of the galvanized layer is too thin. A thin passivation film results in poor corrosion resistance. The thickness of the passivation film should be moderately increased.
5.The workpiece is severely damaged during transportation or assembly, resulting in damage to the passivation film of the coating and affecting its corrosion resistance. The trivalent chromium passivation film does not have self-healing function after being damaged, so it is necessary to minimize damage as much as possible.
The above are the main reasons why the corrosion resistance of the workpiece is poor and the salt spray test does not meet customer requirements during the production process of using trivalent chromium colored zinc passivation solution. If you want to learn more about trivalent chromium colored zinc passivation solution, please feel free to call us for consultation. Bigely Technology is always at your service.
