In the aluminum alloy plating process, secondary zinc deposition is an important step. This process not only concerns the quality of the coating, but also directly affects the service life of the product. In this article, we will analyze the necessity of secondary zinc deposition in aluminum alloy plating, and understand which kind of zinc deposition water is beneficial to aluminum plating.
Primary zinc deposition forms a fine, well adhered zinc layer on the aluminum surface, providing a good deposition base for subsequent metal plating. However, even after primary zinc deposition, due to physico-chemical differences between the aluminum and the coating (e.g., coefficient of thermal expansion, atomic radii, crystal lattice structure, etc.), the coating may still exhibit poor adhesion, bulging, or cracking under certain conditions.
To solve this problem, a secondary zinc deposition process is often used in the electroplating process. Secondary zinc deposition is performed again on top of the primary zinc deposition to repair any defects that may exist in the initial zinc deposition, such as unevenness, holes, or weak areas, while increasing the thickness of the zinc layer to form a denser, more homogeneous zinc layer. This optimized zinc layer not only improves the adhesion of the coating, but also enhances its corrosion resistance. Because zinc is more active than aluminum in the electrochemical series, it can react preferentially with the environment in a corrosive environment, which is equivalent to providing sacrificial protection for the aluminum, thus extending its service life.
In practice, Bigely aluminum zinc deposition water BC-22 is preferred for its good properties. It ensures the formation of a zinc layer that is tightly bonded to the aluminum substrate after the primary zinc bath and provides a good basis for the subsequent secondary zinc bath.
About Bigely Technology
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 chemicals. As a fast growing electroplating chemicals supplier 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.
Our products are widely used to meet the plating needs of different industries and exported to many countries from all over the world. They can meet the environmental protection standard after use, mainly used in automobile parts, sanitary ware, electronic products, hardware, furniture, building accessories and other fields.
If you need our high-quality electroplating chemicals, please contact us. We can provide you samples to you for test, and also provide a series of services.