Currently, aluminum alloys are widely used in various fields, and we can observe numerous aluminum alloy castings in the market. However, improper production processes or usage may lead to oxidation, typically manifesting as yellow spots and discoloration on the surface. Below, we will explore the oxidation phenomena that occur in aluminum alloy die-castings.
Since aluminum is inherently a reactive metal element, it tends to undergo chemical reactions in the air. Aluminum alloy castings, which are high-aluminum-content alloys, are processed by melting, resulting in tiny gaps between grains. Corrosive gases (including moisture containing carbon dioxide) can easily penetrate these gaps, leading to corrosion. After corrosion, aluminum oxide appears in powdered or fibrous forms, and the coloration of oxides from elements like copper in the alloy makes it look as if it has mold. Therefore, to address the oxidation phenomenon on the surface of aluminum alloy die-castings, Huayin Die-Casting employs specific measures for control, such as surface treatments, painting, and electrophoretic passivation, to prevent the occurrence of oxidation in aluminum alloy die-castings. Additionally, aluminum alloy die-castings should be stored in a dry and cool environment to minimize the risk of oxidation.
After understanding the causes of oxidation in aluminum alloy die-castings, you will no longer approach the resolution of such issues blindly