The secret of aluminum die casting and sulfuric acid anodizing

by:Zeyi     2022-01-05
Anodizing is an electrochemical method. In an appropriate electrolyte, alloy parts are used as anodes, and stainless steel, chromium, or conductive electrolyte itself is used as cathodes. Under certain voltage and current conditions, the anode is oxidized, thereby The process of obtaining anodized film on the surface of the workpiece. According to the type of electrolyte and the properties of the film, it can be divided into sulfuric acid, chromic acid, oxalic acid, mixed acid, hard and porcelain anodizing; according to the dyeing performance of various anodized films, only sulfuric acid anodizing is the most suitable one. Dyeing; others such as oxalic acid and porcelain anodic oxide film can be colored, but the interference color is serious; chromic acid anodic oxide film or hard oxide film can not be colored; comprehensively, to achieve the purpose of anodic oxidation and coloring, only There are sulfuric acid anodizing lines. 1. The limitation of sulfuric acid anodizing on aluminum alloy material:    1. The presence of alloy elements will reduce the quality of the oxide film. Under the same conditions, the oxide film obtained on pure aluminum is the thickest, the highest hardness, the best corrosion resistance, and uniformity. Degree is the best. For aluminum alloy materials, in order to obtain a good oxidation effect, the content of aluminum must be ensured. Under normal circumstances, it is better to not less than 95%. 2. In the alloy, copper will make the oxide film reddish, destroy the quality of the electrolyte, and increase the oxidation defects; silicon will make the oxide film gray, especially when the content exceeds 4.5%, the effect is more obvious; iron is due to its own characteristics. After anodization, it will exist in the form of black spots. 2. The main classification and composition composition of commonly used die-cast aluminum alloys:    commonly used die-cast aluminum alloys can be divided into three main categories; one is aluminum-silicon alloy, which mainly includes YL102 (ADC1, A413.0, etc.), YL104 (ADC3, A360, etc.) ); The second is aluminum silicon copper alloy, mainly including YL112 (A380, ADC10, etc.), YL113 (3830), YL117 (B390, ADC14) ADC12, etc.; the third is aluminum-magnesium alloy, mainly including 302 (5180, ADC5,) ADC6, etc. .   For aluminum-magnesium alloys, it can be oxidized and colored, which is an important feature that distinguishes it from other alloys; but in comparison, there are some shortcomings. 1. The anodic oxide film has duality, with large pores and uneven distribution, which makes it difficult to achieve the best anti-corrosion effect;    2. Magnesium has a tendency to produce hardening and brittleness, reduce elongation, and increase thermal cracking, such as ADC5, ADC6 In production, due to its wide solidification range and high shrinkage tendency, shrinkage porosity and cracks are often generated, and the casting performance is extremely poor. Therefore, there are large limitations in its scope of use, and workpieces with a slightly complex structure are not suitable for production.  3. Because of its complex composition and low aluminum purity, the aluminum-magnesium alloy commonly used in the market is difficult to produce a transparent protective film when sulfuric acid anodizes. It is mostly milky white and has poor coloring. It is difficult to achieve the desired effect according to the normal process. In summary, it can be seen that common die-cast aluminum alloys are not suitable for sulfuric acid anodization; however, not all die-cast aluminum alloys cannot achieve the purpose of oxidation and coloring, such as aluminum-manganese-cobalt alloy DM32, aluminum-manganese-magnesium alloy DM6, etc. Die-casting performance and oxidation performance are both excellent, but it has not been popularized because of the short time of entering the country. ————The article comes from the Internet. If there is any infringement, please contact to delete it.
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