Trivalent chromium blue white zinc passivation process is a surface treatment process used to prevent metal corrosion, often used to treat iron, steel, copper and their alloys and other metal surfaces. The purpose of chromium passivation treatment is to form a dense conversion film on the surface of the metal, which can improve the corrosion resistance of the metal, improve the adhesion of the coating, enhance the wear resistance of the metal, and also provide a beautiful appearance. So what are the common faults of the trivalent blue and white passivation process?
1. Uneven conversion film: If the ratio of conversion liquid in the treatment process is not correct or insufficient stirring, it may lead to uneven conversion film formed on the metal surface, thus affecting its anti-corrosion effect.
2. The color of the conversion film is inconsistent: the color of the passivation conversion film of the trivalent chromium blue and white zinc passivation process may vary due to small changes in operating conditions. Temperature, PH value, passivation solution concentration and soaking time may affect the color consistency of the conversion film.
3. The conversion film is not strong: if the preparation of the metal surface under the galvanized layer is not in place, or the composition change caused by the use of the passivation liquid for too long, it may lead to the formation of the conversion film with weak adhesion and easy to fall off.
4. Insufficient corrosion resistance of passivation film: If the passivation process is not controlled properly, such as the immersion time is too short or the activity of the passivation liquid is reduced, the passivation film may be formed with insufficient corrosion resistance.
5. Passivation tank pollution: With the increase of use time, there will occasionally be other metal ions or pollutants into the passivation liquid, which will affect the passivation effect.
6. Water marks and spots: After passivation treatment and washing, if the workpiece is not dry enough or the water quality is not pure, it may leave water marks and spots on the surface.
7. Salt spray test fails: When salt spray test is carried out, it is found that the passivation workpiece can not meet the expected corrosion resistance requirements, which may be caused by insufficient passivation treatment or uneven passivation film.
To solve and prevent these problems, it is necessary to use Bigelay blue and white passivation solution, while ensuring the strict implementation of process standards and work guidelines, regular inspection and maintenance of passivation tank solution, timely replacement and adjustment of passivation solution composition, so as to extend the life of the plating solution and improve the salt spray performance of the passivation film.
If you are interested in blue and white passivation solution, please feel free to contact us.
