Electrolytic degreasing is a crucial step in the electroplating process, aiming at removing the oil on the surface of the workpiece and ensuring the uniform adhesion of the subsequent plating layer. However, alloy workpieces always have problems such as discoloration and corrosion after degreasing, which causes problems for many plating engineers. To address this situation, this paper analyzes this phenomenon and provides effective solutions.
Zinc-nickel alloy coatings are widely used in many industrial applications due to their excellent corrosion resistance, high hardness and good decorative properties. Black passivation is a surface treatment process that provides better protection for zinc-nickel alloy coatings and gives them an attractive black surface. However, during the black passivation process, the surface of the coating is prone to coloration, which affects the appearance and corrosion protection. The coloration is caused by the non-uniformity of the passivate layer and is usually due to the following reasons:
After zinc-nickel alloy plating, colored passivation is often intended to improve corrosion resistance and add aesthetic appeal. However, poor results when performing salt spray testing can stem from several key factors:
In recent years, with the rapid development of new energy vehicles, electroplating technology plays a key role in ensuring the performance of auto parts and reducing manufacturing costs. Zinc-nickel alloy plating process has become a popular choice in the new energy vehicle industry due to its good corrosion resistance and mechanical strength. Among them, Bigely BZ-617 alkaline zinc-nickel alloy brightener has attracted much attention because of its own properties.
The instability of the electroless nickel plating solution also directly affects the efficiency and cost of plating production. Due to the frequent fluctuations in the composition of the plating solution, the operator has to adjust the process parameters frequently, which increases the complexity of process management. This not only wastes a lot of time and energy, but also increases the consumption of chemicals and production costs. In serious cases, unstable nickel plating solution may even lead to the scrapping of the whole plating bath, resulting in huge economic losses.
Some customer inquired that how many hours of neutral salt spray test can the passivated workpiece reach during the production process using electroplated colored zinc passivator.
