During the production process using nickel plating additives, the concentration of iron ion impurities in the plating solution becomes higher and higher. Where do these iron impurities come from?
Iron impurities in chemical materials, iron in tank water and make-up water are the causes of iron impurities in nickel plating solution. Poor cleaning of steel parts after pickling or high iron content in the cleaning water are also the reasons for iron impurities in the plating solution. However, the main reason for the generation of iron impurities in the plating solution is that iron ions are generated when steel parts are corroded in the plating bath.
When the iron ion in the plating solution exceeds 50mg/L, the nickel layer will produce burrs or pinholes, as well as blackening in the low current density area. If the pH of the plating solution is low, iron hydroxides will precipitate and become entrapped in the layer, making it brittle. Alkaline salts of iron hydroxide make it easier for hydrogen bubbles to remain on the cathode surface, causing pinholes and increasing the porosity of the plated layer.
Iron impurities in the plating solution can be removed by chemical method: use dilute sulfuric acid to reduce the plating solution pH to about 3.0, add 1~2ml/L of 30% hydrogen peroxide under stirring, heat the plating solution to 60 ℃, stirring for 1~2 hours, and then adjust the pH value to more than 5.5, continue to stir and hold for 2 hours, let stand, filtering, and then dilute sulfuric acid to adjust the pH to the normal range, can be produced.
About Bigely Technology
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 additives. As a famous electroplating additives source manufacturer in China, Bigely Technology is a national high-tech enterprise with a strong research and development team, which has over 10 engineers with more than 20 years' working experience in the electroplating industry.
Our products are widely used to meet the plating needs of different industries and exported to many countries from all over the world. They can meet the environmental protection standard after use, mainly used in automobile parts, sanitary ware, electronic products, hardware, furniture, building accessories and other fields.
If you need our high-quality electroplating additives, please contact us. We can provide you samples for test, and also provide a series of services.
