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In the production process of using potassium chloride galvanizing additive, the influence of iron impurities should be paid attention to in barrel plating production

2022-04-30

    Mr. Chen's barrel plating line using potassium chloride galvanizing additive has been stable.However, in the past few days, it was found that the coating of the plated workpiece in the low current area was slightly yellow, and the serious part was gray-black.Although the effect after light emission will be better, but the passivation film has yellowing phenomenon after blue-white passivation treatment. What is the reason?

    After on-site inspection, Bigolly's engineers determined that this was the effect of iron impurities in the plating solution.Although the workpiece has undergone the process of degreasing and acid activation, some workpieces stay in the water tank for a long time before entering the acid zinc tank, so that the workpiece will produce floating rust when galvanizing.When the engineer reported to the operator, the operator just said that the drum was deformed.The engineer used a magnet to suck out a large number of fine flakes and iron filings that had been corroded to varying degrees from the bottom of the plating tank.

    In fact, the bath of the potassium chloride barrel galvanizing process is easy to accumulate iron impurities.The engineer took samples of the plating solution and analyzed it, and found that the concentration of iron impurities was 271ppm, and the accumulation rate was very fast.After the engineer took the plating solution for the iron removal experiment, he helped Mr. Chen's galvanizing tank to deal with iron impurities:Add 30% hydrogen peroxide 0.5~1.0g/L to the plating solution, stir the plating solution for 30~60min, and adjust the pH value of the plating solution to about 6.0 after standing for 20min.Continue to stir the plating solution for 30 to 60 minutes and then filter the plating solution to remove most of the iron impurities by filtration.After that, adjust the pH value and main salt composition of the plating solution, and try plating ok.

    Bigolly engineer made 3 suggestions to Mr. Chen:1. After the workpiece is degreasing and acid activated, it should be galvanized as soon as possible to avoid rust caused by placing it in the sink for too long;2. In the production process, check the feeding port of the drum to avoid the deformation of the feeding port, which will cause the workpiece to fall into the plating tank to dissolve and generate iron impurities;3. Use a magnet to salvage the workpieces in the groove regularly every day to avoid the accumulation of excessive iron impurities in the plating solution.

    In this way, Mr. Chen's galvanizing line resumed normal production.Mr. Chen lamented that he knew that the impact of iron impurities was great, but the negligence of the operator had affected the progress of production.Fortunately, Bigolly's engineers can solve problems in time and reduce losses. Bigolly's technology and services are worthy of long-term cooperation!

    Bigolly Technology has always adhered to the service-oriented business philosophy, providing customers with product quality and technologically innovative potassium chloride galvanizing additive,And provide customers with fast and thoughtful service, do our best to solve every problem that customers encounter in production in a timely and fast way!