Chemical polishing and electrochemical polishing of aluminum

General aluminum alloy materials or aluminum profiles for general engineering applications. After the semi-finished products are processed and formed, they can be directly anodized by directly entering the anodizing and oxidation production line.

The anodized film obtained has shown good protection performance in many engineering applications, and the surface can basically achieve uniform appearance requirements. If the aluminum workpiece after mechanical polishing is directly anodized, only a smooth anodic oxide film can be obtained, and a highly reflective film layer cannot be obtained.

Chemical polishing or electrochemical polishing as a high-grade finishing treatment method can remove relatively slight mold marks and scratches on the surface of aluminum products, remove frictional striations, thermal deformation layers, and oxide film layers that may be formed during mechanical polishing, and make rough surfaces. The surface tends to be smooth and obtains a mirror-like and glossy surface, improves the decorative effect of the aluminum product (such as reflection property, brightness, etc.), and can impart higher commercial added value, greatly satisfying the consumer market with a glossy surface Aluminum product requirements. Therefore, for the anodized film requiring a special surface appearance such as smooth surface, uniform and bright, it requires chemical polishing or electrochemical polishing in advance. Chemical polishing and electrochemical polishing, like mechanical polishing, are indispensable surface preparation techniques for the preparation of surface finishes for high-precision polished aluminum products. In some cases, they can be used as finishing tools for finishing.

Chemical polishing and electrochemical polishing can make a special aluminum material a very bright surface, but from the polishing principle, chemical polishing (and electrochemical polishing) and mechanical polishing are essentially different. Mechanical polishing is the use of physical means through the role of cutting and grinding to plastic deformation of the surface of aluminum, so that the surface of the convex part to fill the recess, so that the surface roughness of aluminum reduce, become smooth, improve the surface of aluminum Roughness, so that its surface is smooth or shiny. However, mechanical polishing causes the destruction of crystals on the surface of the metal, deterioration of the metal to produce a plastic deformation layer, and the generation of a tissue change layer due to local heating.

Chemical polishing is a kind of chemical etching under special conditions. It controls the selective dissolution of the surface of the aluminum material, so that the surface of the aluminum material is preferentially dissolved in the microscopic convex part of the surface than other parts of the concave part, and the surface is smooth and bright. Electrochemical polishing, also known as electropolishing, is similar to chemical polishing in that it also relies on selectively dissolving tiny protruding portions of the aluminum surface to achieve a smooth surface. Aluminum is immersed into the prepared electrolytic solution as an anode, and a corrosion-resistant and electrically conductive material is used as a cathode. According to the principle of electrochemical tip discharge, the micro-embossed area of the aluminum surface preferentially dissolves after being energized, and at the same time the dissolved product The surface electrolyte forms a high-resistance viscous liquid film layer, and the micro-projection layer film is thinned, and its resistance is small, so that preferential dissolution is continued. At the same time, the liquid film layer on the surface of the dome is thick, the resistance increases, and the dissolution rate of the dome is relatively slow. After a short period of electrolytic treatment, the convex part is dissolved and leveled to the position of the dome part, and the aluminum surface is rough. The degree is reduced to achieve smooth light. Electrochemical polishing of aluminum is referred to in some literature as electropolishing or electrolytic polishing. In the industrial production, the main purpose of using chemical polishing or electrochemical polishing is to replace the mechanical polishing to obtain a smooth and bright aluminum surface; the second is to perform chemical polishing or electrochemical polishing after mechanical polishing to obtain a very high mirror surface Reflective aluminum or aluminum parts achieve surface brightening.

Compared with chemical polishing and mechanical polishing, chemical polishing and electrochemical polishing have the following advantages: 1 The equipment is simple, the process parameters are easy to control, the cost of infrastructure and equipment needed for mechanical polishing can be greatly saved, and in some cases, the mechanical polishing is partially replaced or continued. The surface brightness is higher; 2 can handle large parts or large quantities of small parts, and the complex shape of the workpiece can not be automated mechanical polishing process, in this case mechanical polishing is irreplaceable; 3 after chemical or electrochemical polishing The surface is clean, there is no residual mechanical polishing dust, there is a good corrosion resistance; 4 chemical polishing surface mirror reflectance is higher, the metal texture is also better, the surface will not form a cream.

Jiangmen Gude Polishing Equipment Co., Ltd. established in 2010,We are a Polishing materials manufacturer focused on research and develop,produce and sell all kinds of Polishing Compound, buffing wheels, and accessories,After 13 years development,own 2 subsidiary of a factory and our factory has passed ISO9001 quality management system cetification and Midea audit.                

                                                 　　　
We produce and sell polishing compound for metal ,wooden,musical instrument,furniture,Car paint surface etc,And all matching polishing wheels.We continuously optimize the formula to make the product use with better cutting force and faster brightness.          

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