In the electroplating process, black zinc passivator is widely used in the post-treatment of galvanized layers to improve the corrosion resistance and decorative properties of the coating. However, in practice, the phenomenon of whitish coating sometimes occurs, which not only affects the appearance quality of the product, but also may reduce its protective properties. In this issue, we will analyze the causes of this phenomenon.
Insufficient thickness of galvanized layer: After the workpiece is black passivated, if the galvanized layer is too thin, then it will be easily corroded during storage, resulting in the phenomenon of white rust, i.e. small white spots. This is because the thickness of the galvanized layer, as an anodic protective layer, directly affects the corrosion resistance of the passivation film.
Black zinc passivator quality problems: some black passivators due to immature formulations or impure raw materials and other reasons, resulting in the workpiece passivation failed to obtain a dense passivation film. This passivation film not only has poor corrosion resistance, but is also prone to whitening.
Choose a reliable black zinc passivator such as Bigely BZ-216. This passivator is designed for pickled zinc deposits in the galvanizing process and produces a dense, homogeneous and highly corrosion-resistant black passivate film on the galvanized surface. It improves the blackness and corrosion resistance of the passivate film.
Film whitening is one of the common problems in the black zinc passivation process, but by controlling the thickness of the galvanized layer, regular testing of the passivate, and selecting a good quality black zinc passivator, we can try to avoid this phenomenon. Bigely black zinc passivator BZ-216 has become one of the choices for many electroplating companies due to its good performance and stable quality.
About us
Guangdong Bigely Technology Co., Ltd. ,founded in 2003, is a high-tech enterprise integrating R & D，production, sales and service, specializing in the production of electroplating additives. As a famous electroplating additives manufacturer in China, Bigely has over 20 years' experience in electroplating additives production and own production base of 5000 square meters. We can produce 15,000 tons of electroplating additives every year, which can fully meet the needs of customers.
The core raw materials of our products are made of international brand products such as BASF from Germany with high purity and low impurity. The production process is in strict accordance with the requirements of ISO9001 quality management system to ensure the stability of product quality.
If you need our high-quality electroplating additives, please contact us. We can provide you samples to you for test, and also provide a series of services.
