When we use alkaline galvanizing additives, in order to maintain good electrochemical performance in the plating solution and obtain a galvanized layer with excellent performance, it is necessary to strictly control the concentration of zinc, alkali and their ratio in the plating solution.In production, it is very important to accurately analyze the concentration of zinc and alkali, because the concentration of zinc and alkali fluctuates too much, and their ratio will also change, thus affecting the performance of the coating.
Some time ago, during the production process of using alkaline galvanizing additives, the customer Mr. Liu was negligent when analyzing the plating solution, and the original zinc ion concentration of 10.3g/L was only 7.6g/L.Since the zinc ion concentration of the rack plating production line should be controlled within the range of 10~12g/L, Mr. Liu added a calculated amount of zinc plate and sodium hydroxide to the zinc dissolving tank to dissolve.
After a day, the workpiece produced by Mr. Liu was rough in the high area, and the brightness of the coating was poor.Mr. Liu thought that the alkaline galvanizing additive was improperly used, so he asked Bigolly's engineers to help solve the problem.Through analysis, it was found that the zinc ion concentration of the plating solution was 14.3 g/L, and the alkali concentration was 129 g/L.This is obvious that the zinc is high and the alkali is low, and the ratio of zinc to alkali is out of range, but taking part of the plating solution with adjusted concentration to carry out the Hull cell experiment, it is found that the concentration of the additive is normal, which excludes the improper use of alkaline zinc plating additives.
The zinc ion concentration has a very important influence on the properties and quality of the zinc coating.When the zinc ion concentration in the plating solution is high, the current efficiency will increase, but the dispersing ability and deep plating ability will decrease, and the coating on the sharp edge of complex parts is rough and not bright.
After the help of Bigolly engineers to dilute the alkaline zinc plating solution, the concentration of zinc and alkali in the plating solution and the ratio of zinc to alkali gradually returned to normal, the workpieces produced are good in appearance and performance quality, indicating that the plating solution has returned to normal.Through this incident, Mr. Liu understood that it is very important to accurately analyze the zinc alkali concentration in the plating solution when using alkaline galvanizing additives.Otherwise, my own analysis is wrong and it will affect production, which is really not worth it.
Therefore, the accurate analysis of the zinc alkali concentration in the alkaline zinc bath is very important. Once the analysis is wrong, more raw materials will be added, the quality of the produced workpieces will be poor, and the production cost will be increased.Therefore, the accurate analysis of the bath is to save the production cost, and it is also possible to better use the alkaline galvanizing additives.