What is the purpose of ammonia when using a copper pyrophosphate brightener? How to control its content? Let's analyze it in this issue.
The main role of ammonia is to improve the appearance quality of copper plating, improve the gloss and bonding of the plating, and promote the dissolution of the anode. When the content of ammonia is low, the anode is easy to passivate and generate copper powder, while the plating layer at high current density or at the edge will produce white mist or roughness and dark color, it is generally appropriate to add 0.5~1.0mL/L.
When using copper pyrophosphate brightener, ammonia is easy to decompose and volatilize ammonia, so it needs to be replenished frequently. In summer, the amount of ammonia replenishment should be more.
Ammonia is basically consumed as a gas that is played into the air. Currently, most plating plants judge the ammonia content based on odor or the appearance of the plated layer. However, this empirical management method has an obvious drawback: it is easy to generate considerable errors due to changes in temperature and pH.
In the production of copper pyrophosphate brightener applications, when the temperature is low and the pH is low, the volatilization of ammonia is low and there is a danger of causing excessive replenishment. Especially for through-hole plating of printed wiring boards with strict requirements for copper plating, the content needs to be controlled by quantitative analysis under the guidance of Bigely engineers.
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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 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.
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