Mr. Liu in Huizhou, Guangdong Province, is an electroplating factory owner engaged in the galvanization processing of various hardware products and stamping parts. Recently, Mr. Liu found that the black passivation solution always exceeds the phosphorus standard when discharging wastewater, as this violates the discharge standard of the electroplating park, so Mr. Liu would like to replace a phosphorus-free black zinc passivation solution in a hurry.
Mr. Li from Ningbo, Zhejiang Province is the owner of an electroplating plant engaged in the production of galvanized various automotive parts and electrical parts. When Mr. Li's galvanizing automatic line was using a certain brand of blue-white passivator, there was always this problem: there was a time difference between the entry and exit of the workpieces into the tank, which resulted in uneven thickness and color of the passivation film, and it could not satisfy the customer's high quality requirements. So Mr. Li wanted to find a trivalent chromium blue-white passivator with uniform thickness and color appearance.
The galvanized blue and white passivation process is widely used in corrosion prevention applications, however, sometimes the process fails to pass the 96-hour salt spray test, which has caused a lot of concern in the industry. One of the main reasons for this problem is the quality of the passivation solution.
In the acid galvanizing process, the bonding of the coating is affected by a number of factors, and it is critical to ensure good adhesion of the coating to the substrate. Factors affecting adhesion include surface preparation, bath composition and operating conditions.
What is the cause of blistering in alkaline galvanizing process? In addition to the unclean pre-treatment stated in the previous article, you can also investigate from the following 4 directions.
The tin plating additives used in the sulfate matte tin plating process have a direct impact on the quality of the plated layer, and the plated layer scratching is often related to the use and regulation of these additives. The type of additives, their concentration and their ratio in the plating solution will affect the final quality of the plated layer.
