A lot of science and technology are on the aluminum alloy die casting surface how to do smooth, scrub effect, aluminum is how to make this curvature of the surface is very interested in today by Yu Xin Xiaobian to tell you about the common aluminum Five kinds of surface treatment methods for die casting.

 

The effects of accelerators, fluorides, Mn2 +, Ni2 +, Zn2 +, PO4 and Fe2 + on the phosphating process of aluminum were studied by SEM, XRD, potential - time curve and membrane weight change. The results show that guanidine nitrate has the characteristics of good water solubility, low dosage and rapid film formation. It is an effective accelerator for phosphating of aluminum: fluoride can promote film formation, increase film weight and refine grain; Mn2 +, Ni2 +, energy The Zn2 + concentration is low, the film can not be formed or the film is poor, with the increase of Zn2 + concentration, the membrane weight increases; PO4 content is different from that of phosphating film Membrane weight greater impact, improve PO4. The content of phosphating film is increased.

 

The effects of corrosion inhibitors and viscosity agents on the polishing effect were compared. The alkaline solution system with good polishing effect was successfully obtained, and the operation temperature was reduced for the first time, and the solution was prolonged. Life, while also improving the polishing effect of the additive. The experimental results show that the addition of the appropriate additives in NaOH solution can produce good polishing effect.

The exploratory experiment also found that the surface reflectivity of the aluminum surface can reach 90% after DC constant pressure electrolysis with NaOH solution under certain conditions, but there are still some unstable factors due to the experiment, which need further study. The feasibility of using DC pulsed electrolytic polishing method to polish aluminum under basic conditions is explored. The results show that the pulse electrolysis polishing method can achieve the leveling effect of DC constant voltage electrolytic polishing, but its leveling speed is slow.

 

To determine the development of phosphoric acid-sulfuric acid-based liquid-based chemical-based chemical polishing new technology, the technology to achieve zero emissions of NOx and overcome the similar quality defects in the past. The key to new technology is to add some special compounds in the base fluid to replace nitric acid. For this reason, it is necessary to analyze the process of chemical polishing of aluminum triacs, especially the effect of nitric acid. The main role of nitric acid in aluminum chemical polishing is to suppress point corrosion and improve the polishing brightness. In combination with pure acid phosphate in a chemical polishing test, it is believed that the addition of special substances in phosphoric acid monosulfic acid should be able to inhibit point corrosion, slow down overall corrosion, and must have good leveling and brightening effect

 

The process, properties, morphology, composition and structure of the amorphous composite film were studied by anodic oxidation of aluminum and its alloys in neutral system. The film formation process and mechanism of the film were discussed.

The results show that the concentration of controlled film accelerator is 2.5 ~ 3.0g / l in Na_2WO_4 neutral mixed system,

The concentration of the complex film 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, the weak mixing can be obtained, and the gray series inorganic Metal film. The film has a thickness of 5 to 10 m, a microhardness of 300 to 540 HV, and excellent corrosion resistance. The neutral system has good adaptability to aluminum alloy, rust-proof aluminum, forging aluminum and other series of aluminum alloy can be better film.

 

YL112 aluminum alloy is widely used in automobile, motorcycle structural parts. The material needs to be surface treated prior to application to improve its corrosion resistance and form a layer of surface that is readily bonded to the organic coating to facilitate subsequent surfaces.