Why does the tin anode experience accelerated dissolution? This is a question raised by many electroplating factories when using tin plating brighteners. In this article, we will analyze it.
An electroplating factory in Shandong Province specializes in the process of bright tin plating. During one production run, it was discovered that the concentration of tin ions in the solution was one-third higher than the prescribed process range. Why was this the case? It turned out that the operator mistakenly converted the unit of "grams per liter" to "milliliters per liter" when adding sulfuric acid two months ago, resulting in a doubling of the total amount added.
Because sulfuric acid will dissolve the tin anode, this will cause the concentration of tin salts in the solution to increase as well, resulting in two disadvantages:
① Waste of tin anode
② Increase the cost of wastewater treatment
When the sulfuric acid content meets the requirements of the process formula, the presence of sulfuric acid can play the following roles:
① Inhibit the oxidation of divalent tin ions
② Improve the stability of the plating solution
③ Enhance the conductivity and uniform coating ability of the plating solution
④ Increase cathode polarization
⑤ Make the coating have fine crystallization and accelerate the dissolution of the tin anode
⑥ Increase the anode current efficiency
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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.
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