Method 1: Aluminum phosphating.
The effects of accelerators, fluoride, Mn2+, Ni2+, Zn2+, PO4 and Fe2+ on the phosphating process of aluminum materials were studied in detail using SEM, XRD, potential time curve, film weight changes and other methods. Studies have shown that guanidine nitrate has the characteristics of good water solubility, low usage, and rapid film formation. It is an effective accelerator for aluminum phosphating: fluoride promotes film formation, increases film weight, refines grains Mn2+, Ni2+, and can significantly Refine the grains, make the phosphating film uniform and dense, and improve the appearance of the phosphating film. When the concentration of Zn2+ is low, the film formation and film formation difference content increase the weight of the phosphating film.
Method 2: Aluminum alkaline electrolytic grinding technology.
The alkaline grinding solution system was studied, the effects of corrosion inhibitors, viscosity agents, etc. on the grinding effect were compared, and an alkaline solution system with good grinding effect was successfully obtained. For the first time, the method of lowering the operating temperature, extending the solution life, and improving the grinding effect was obtained. additive. Experimental results show that adding appropriate additives to NaOH solution will produce good grinding effects.
Exploratory experiments found that after DC constant voltage electrolytic grinding using glucose NaOH solution under certain conditions, the reflectivity of the aluminum surface can reach 90%. However, due to unstable factors in the experiment, further research is needed. Explore the feasibility of using DC pulse electrolytic grinding method to grind aluminum materials under alkaline conditions. The pulse electrolytic grinding method can achieve the flattening effect of DC constant voltage electrolytic grinding, but the flattening speed is slow.
Method 3: Environmentally friendly chemical grinding of aluminum and aluminum.
It is determined to develop a new environmentally friendly chemical grinding technology using phosphoric acid-monosulfuric acid as the base liquid. This technology should achieve zero emission of NOx and overcome the quality defects of traditional technology. The key to the new technology is to add compounds with special effects to the base fluid instead of nitric acid. Therefore, the three-acid chemical grinding process of aluminum must first be analyzed, with special emphasis on the role of nitric acid. The main function of nitric acid in aluminum chemical grinding is to inhibit pitting corrosion and improve grinding brightness. Combined with the chemical grinding test in simple phosphoric acid and sulfuric acid, the special substances added to phosphoric acid and sulfuric acid should be able to inhibit pitting corrosion and alleviate general corrosion, and should have good smoothing and gloss effects.
Method 4: Electrochemical surface strengthening treatment of aluminum and its alloys.
The technology, performance, shape, composition and structure of aluminum and its alloys formed by anodic oxidation deposition in neutral systems to form ceramic-like amorphous composite conversion coatings. The film process and mechanism of the coatings were preliminarily discussed.
Research results on aluminum alloy die-casting technology show that the Na_2WO_4 neutral mixing system controls the film accelerator concentration to be 2.5~3.0g/l
The concentration of the complexing film-forming agent is 1.5~3.0g/l, the concentration of Na_2WO_4 is 0.5~0.8g/l, the peak current density is 6~12A/dm2, and weak stirring can obtain a complete, uniform, and glossy gray series of inorganic non-metals film layer. The film thickness is 5~10μm, the microhardness is 300~540HV, and the corrosion resistance is excellent. This neutral system has good adaptability to aluminum alloys, and multiple series of aluminum alloys such as rust-proof aluminum and forged aluminum can become membranes.
Method 5: YL112 aluminum alloy surface treatment technology.
YL112 aluminum alloy is widely used in structural components of automobiles and motorcycles. The material must be surface treated before application to improve its corrosion resistance and form a surface layer that is easy to combine with organic coatings, which is beneficial to subsequent surfaces.
