How to carry out alkali etching of cast aluminum parts

How to carry out alkali etching of cast aluminum parts

Cast aluminum parts contain not only free silicon but also various compounds between metals and other inclusions. Due to the loose structure of the cast aluminum parts, there may be uneven segregation of chemical components, etc. At the same time, the unprocessed surface will form a dense oxide film when cooled after casting. Alkali corrosion time is short, the cast aluminum may not be completely removed, and due to alkaline dissolution of cast aluminum when the dissolution rate is faster, after alkali etching will often lead to excessive corrosion of cast aluminum parts, resulting in tolerance size Changes can even cause product obsolescence.