How to control the concentration of aluminum ions in electroplating?
ã€China Aluminum Industry Network】In anodizing, operate under normal process conditions to avoid operating at excessively high current densities and high temperatures, otherwise aluminum ions may accumulate.
In order to avoid the newly formulated anodizing solution from affecting the quality of the obtained film due to absence of aluminum ions, it is better to adopt partial replacement when it is normally replaced, such as leaving a l/3 or 1/4, so that the solution after replacement is still appropriate Concentrations of aluminum ions exist. If the original solution is completely replaced due to contamination, the following method may be used to provide a certain amount of aluminum ions.
(1) power treatment. Before the temperature of the newly prepared solution has not dropped to the working temperature, anodizing is carried out using scrap aluminum pieces or scraps. The dissolution rate of aluminum is high at high temperatures, and the requirement can be satisfied after 3 to 4 hours.
(2) Add aluminum powder. Adding aluminum powder 2~3g/L when preparing the solution can also meet the requirements.
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