Friends who are familiar with aluminum castings should know that due to factors such as process or materials, the surface of the manufactured aluminum castings will be very rough. In order to meet the usage requirements, such as performing alkali etching treatment on the product to improve the surface quality of aluminum castings. But this operation is not that easy, and many aspects need to be noted, such as the presence of various compounds and other inclusions between metals; Uneven chemical composition segregation caused by organizational looseness; The surface of aluminum castings appears rough due to factors such as the lack of dense oxide film formation during cooling after casting. At the same time, we also found that alkali etching treatment can play a key role in improving this problem. However, controlling the alkaline etching time is a difficult and critical point. If the alkaline etching time is short, aluminum castings may not be completely removed; However, if the time is too long, it can also cause excessive corrosion of the product, resulting in changes in tolerance dimensions. So a good solution is to change the alkali etching process, which means that alkali etching treatment is carried out after casting. This not only improves the surface quality, but also prevents various problems caused by alkali etching. After the alkaline etching treatment of the product is completed, 1:1 hydrochloric acid can be used for rapid light treatment, which will achieve more ideal results.
How to make the alkali corrosion treatment of aluminum castings exert its best effect
2025 07/08