In recent years, black zinc passivation has been widely used as a common electroplating process to improve the appearance and corrosion resistance of galvanized layers. However, some users have found that after using black zinc passivation solution, the film salt spray capability of electroplated products has instead decreased. This phenomenon has attracted widespread attention from relevant researchers and industry. In order to effectively solve this problem, we need to gain a deeper understanding of the reasons behind it, which can be explored in the following aspects.
In the trivalent chromium colored zinc passivation process, the quality of the plating solution plays a crucial role in the quality of the passivated film layer formed. Among other things, the high content of heterometallic impurities such as copper, divalent iron and zinc ions is one of the main reasons for fogging failures in the film layer.
Many customers prefer the color appearance of hexavalent chromium passivator, because after using trivalent chromium zinc passivator, the color appearance of the workpiece does not meet the requirements, or the workpiece coating has poor corrosion resistance and affects the performance of the workpiece.
In the field of metal processing and protection, blue and white zinc passivators are widely used to improve the corrosion resistance of galvanized layers. Among them, blue-white zinc passivation is favored for its good corrosion resistance and ease of operation. This article describes how to test the corrosion resistance of passivated layers with blue-white zinc passivator using a neutral salt spray test.
Some customers have inquired that in the production process of barrel galvanizing using barrel alkaline galvanizing additives, because the workpiece needs brightness, dispersion properties and corrosion resistance have not been able to meet the customer's requirements, today we will introduce a high-performance alkaline galvanizing additive BZ-513.
In the electroplating industry, the whitening of copper plating is a common and complex problem that can be caused by a variety of factors. Let's take a closer look at this phenomenon and its causes, and introduce why the right tin brightener can effectively reduce the failure of white tin plating.
