After using potassium chloride galvanizing additives for production, the electroplating plant needs to do black zinc passivation, but do you know all the production considerations? If you want to get a good quality passivation coating, you need to master the following eight matters.
① Potassium zinc layer requires about 8um, usually under normal current and voltage, barrel plating time of about 3 hours, can ensure that the thickness of the plating layer is about 8um.
②When using potassium chloride galvanizing additives to prepare the plating solution, the plating solution must be clean, iron impurities must not exceed the standard, and you need to use trace amounts of potassium permanganate to remove divalent iron frequently. We can also use 4 times the amount of galvanizing liquid filter continuous filtration. It is critical to prevent or minimize the introduction of iron impurities.
③If the same galvanizing solution is poorly dull and well hung, then it is possible that the galvanizing solution is too high in xeno-metallic impurities, generally speaking, mainly iron impurities. To verify whether this conjecture is correct, you can contact Bigely engineers for chemical analysis.
④When using black zinc passivation solution, we recommend manual handling and no large contact and collision between workpieces.
⑤ After passivation, the stationary water washing time is less than 5 seconds, and then do the sealing treatment (if it is hexavalent chromium, it is recommended to seal it with 0.5g/L chromic acid).
⑥Blow off the water droplets with high pressure air (you cannot use a shaking machine to shake them off unless you can ensure that there is no bruising between the workpieces).
⑦Rapid drying by walking through the drying tunnel.
⑧ After passivation will process, we should try to avoid workpieces touching each other.
About us
Guangdong Bigely Technology Co., Ltd. ,founded in 2003, is a high-tech enterprise integrating R & D，production, sales and service, specializing in the production of electroplating chemicals. As a fast growing electroplating chemicals supplier in China, Bigely has over 20 years' experience in electroplating additives production and own production base of 5000 square meters. We can produce 15,000 tons of electroplating additives every year, which can fully meet the needs of customers.
If you need our high-quality electroplating additives, please contact us. We can provide you samples to you for test, and also provide a series of services.
