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Introduction of surface treatment methods for aluminum alloy die castings
Published:19/11/2018

1. Alkaline alkaline electropolishing
The effects of accelerator, fluoride, Mn2+, Ni2+, Zn2+, PO4, and Fe2+ on the phosphating process of aluminum were studied by SEM, XRD, potential-time curve and membrane weight change. Studies have shown that cerium nitrate has the characteristics of good water solubility, low dosage and rapid film formation, and is an effective accelerator for phosphating of aluminum: fluoride can promote film formation, increase membrane weight, refine grains; Mn2+, Ni2+, energy The grains are remarkably refined, and the phosphating film is uniform and compact, and the appearance of the phosphating film can be improved. When the concentration of Zn2+ is low, film formation or film formation is not good, and as the concentration of Zn2+ increases, the film weight increases; PO4 content phosphating The membrane weight is greatly affected and the PO4 is increased. The content causes the phosphating film to increase in weight.

2. Aluminum phosphating
The effects of accelerator, fluoride, Mn2+, Ni2+, Zn2+, PO4, and Fe2+ on the phosphating process of aluminum were studied by SEM, XRD, potential-time curve and membrane weight change. Studies have shown that cerium nitrate has the characteristics of good water solubility, low dosage and rapid film formation, and is an effective accelerator for phosphating of aluminum: fluoride can promote film formation, increase membrane weight and refine grains; Mn2+, Ni2+ can be obvious Refinement of crystal grains makes the phosphating film uniform and compact and can improve the appearance of the phosphating film; when the concentration of Zn2+ is low, film formation or film formation is not good, and as the concentration of Zn2+ increases, the film weight increases; PO4 content is phosphating film. The impact is greater and the PO4 is improved. The content causes the phosphating film to increase in weight.

3, aluminum and aluminum alloy environmentally friendly chemical polishing
It is determined to develop a new environmentally friendly chemical polishing technology based on phosphoric acid monosulfate, which is to achieve zero emission of NOx and overcome the quality defects of similar technologies in the past. The key to the new technology is to add some special-effect compounds to the base fluid instead of nitric acid. To this end, it is necessary to first analyze the chemical polishing process of aluminum triacid, especially the role of nitric acid. The main role of nitric acid in the chemical polishing of aluminum is to suppress pitting corrosion and improve polishing brightness. Combined with the chemical polishing test in simple mono-phosphoric acid, it is believed that the special substances added in the mono-phosphoric acid should be able to suppress pitting corrosion and alleviate general corrosion, and must have better leveling and brightening effects.

4. Electrochemical surface strengthening treatment of aluminum and its alloys
The process, properties, morphology, composition and structure of aluminum-like alloys in the neutral system were formed by anodizing and depositing in a neutral system. The film formation process and mechanism of the film were preliminarily discussed. The results of the process research indicated that in the neutral mixed system of Na_2WO_4, the concentration of the film-forming accelerator was controlled to 2.5-3.0 g/l, the concentration of the complex membrane was 1.5-3.0 g/l, and the concentration of Na_2WO_4 was 0.5-0.8 g/l. The peak current density is 6~12A/dm~2, and the weak agitation can obtain a complete and uniform gray series inorganic non-metal film layer. The film layer has a thickness of 5 to 10 μm and a microhardness of 300 to 540 HV, and is excellent in corrosion resistance. The neutral system has good adaptability to aluminum alloys, and various types of aluminum alloys such as rust-proof aluminum and forged aluminum can form a good film.
5, YL112 aluminum alloy surface treatment technology
YL112 aluminum alloy is widely used in casting structural parts of automobiles and motorcycles. The material needs to be surface treated prior to application to improve its corrosion resistance and form a surface layer that is easily bonded to the organic coating to facilitate subsequent surfaces.

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