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5 Common Surface Treatment Methods For Aluminum Alloy Die Castings


Everyone is very interested in how to make the surface of aluminum alloy die-casting parts smooth and frosted, and how to make such a curved surface on aluminum alloy. Let BE-CU.COM introduce the common aluminum alloy die casting to you today. 5 surface treatment methods for pieces.

1.The Phosphating Of Aluminum

The Phosphating Of Aluminum

The effects of accelerators, fluorides, Mn2+, Ni2+, Zn2+, PO4; and Fe2+ on the phosphating process of aluminum were studied in detail by using methods such as SEM, XRD, potential-time curve, and film weight change.

Studies have shown that: Guanidine nitrate has the characteristics of good water solubility, low dosage and fast film formation, and is an effective accelerator for aluminum phosphating: fluoride can promote film formation, increase film weight, and refine grains; Mn2+, Ni2+, can Obvious refinement of crystal grains makes the phosphating film uniform and dense and can improve the appearance of the phosphating film; when the Zn2+ concentration is low, the film cannot be formed or the film is poor, and the film weight increases with the increase of the Zn2+ concentration; PO4 content has a great influence on the phosphating film Membrane weight has a great influence, increase PO4. The content increases the weight of the phosphating film.

2.The Alkaline Electrolytic Polishing Process Of Aluminum

The Alkaline Electrolytic Polishing Process Of Aluminum

The research on the alkaline polishing solution system was carried out, and the influence of corrosion inhibitors and viscosity agents on the polishing effect was compared, and an alkaline solution system with good polishing effect was successfully obtained, and it was the first time to obtain a solution that can reduce the operating temperature and prolong the use of the solution. It is an additive that can improve the polishing effect at the same time.

The experimental results show that adding appropriate additives in NaOH solution can produce good polishing effect.

Exploratory experiments also found that after direct current constant voltage electrolytic polishing with glucose NaOH solution under certain conditions, the reflectivity of the aluminum surface can reach 90%, but due to the unstable factors in the experiment, further research is needed.

The feasibility of using DC pulse electropolishing method to polish aluminum under alkaline conditions was explored. The results showed that the pulse electropolishing method can achieve the leveling effect of DC constant voltage electropolishing, but the leveling speed is slow.

3.Aluminum And Aluminum Alloy Environmental Protection Chemical Polishing

Aluminum And Aluminum Alloy Environmental Protection Chemical Polishing

It is determined to develop a new environmentally friendly chemical polishing technology using phosphoric acid monosulfuric acid as the base liquid. This technology needs 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 effects to the base liquid compounds to replace nitric acid.

For this reason, it is first necessary to analyze the three-acid chemical polishing process of aluminum, especially the role of nitric acid. The main function of nitric acid in aluminum chemical polishing is to inhibit pitting corrosion and improve polishing brightness. Polishing test, it is considered that the special substance added to phosphoric acid monosulfuric acid should be able to inhibit pitting corrosion and slow down general corrosion, and must have better leveling and brightening effects

4.Electrochemical Surface Strengthening Treatment Of Aluminum And Its Alloys

Electrochemical Surface Strengthening Treatment Of Aluminum And Its Alloys

The process, performance, morphology, composition and structure of ceramic-like amorphous composite conversion coatings formed by anodic oxidation deposition of aluminum and its alloys in a neutral system, and the film-forming process and mechanism of the film were preliminarily discussed.

The process research results show that in the Na_2WO_4 neutral mixed system, the concentration of the film-forming accelerator is controlled at 2.5-3.0 g/l, the final film-forming agent concentration is 1.5-3.0 g/l, and the Na_2WO_4 concentration is 0.5-0.8 g/l. With a peak current density of 6-12A/dm2 and weak stirring, a complete, uniform and glossy gray series inorganic non-metallic film can be obtained.

The thickness of the film is 5-10μm, the microhardness is 300-540HV, and it has excellent corrosion resistance. This neutral system has good adaptability to aluminum alloys. Can form a film better.

5.The Surface Treatment Technology Of YL112 Aluminum Alloy

YL112 aluminum alloy is widely used in the structural parts of automobiles and motorcycles. The material needs to be surface treated before application to improve its corrosion resistance and form a surface layer that is easy to combine with organic coatings for subsequent surface treatment. .

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