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Common Surface Treatment Methods
May 24, 2017

Surface treatment is the surface of the substrate material to form a layer with the matrix of the mechanical, physical and chemical properties of the surface layer of the process. The purpose of surface treatment is to meet the product corrosion resistance, wear resistance, decoration or other special functional requirements.

Here are some common surface treatment methods:

one. polishing

Polishing refers to the use of mechanical, chemical or electrochemical role, so that the workpiece surface roughness reduced in order to obtain bright, flat surface processing methods. Is the use of polishing tools and abrasive particles or other polishing media on the surface of the workpiece modified processing. Polishing can not improve the dimensional accuracy or geometric accuracy of the workpiece, but rather to achieve a smooth surface or mirror gloss for the purpose, and sometimes to eliminate the gloss (extinction). Usually with a polishing wheel as a polishing tool. Polishing wheel is generally made of multi-layer canvas, felt or leather stacked on both sides of the metal plate with a clamping, the rim coated by the powder and oil and other uniform mixture of polishing agent. Polishing, the high-speed rotation of the polishing wheel (peripheral speed of 20 m / s or more) pressure to the workpiece, so that the surface of the workpiece rolling and micro-cutting, in order to obtain bright processing surface, surface roughness up to Ra0.63 ~ 0.01 μm; when a non-greasy extinction polish is used, the bright surface may be extinction to improve the appearance. For different polishing processes: rough polishing (basic polishing process), in the throw (finishing process) and fine polishing (polishing process), use the appropriate polishing wheel can achieve the best polishing effect, while improving the polishing efficiency.

two. Sandblasting

The process of cleaning and coarsening the surface of the substrate with the impact of high speed sand flow. The use of compressed air as the driving force to form high-speed ** beam will spray (copper ore, quartz sand, emery, iron sand, Hainan sand) high-speed ** to the need to deal with the workpiece surface, so that the surface of the workpiece surface or shape Changes in the surface of the workpiece due to the impact and cutting effect, so that the surface of the workpiece to obtain a certain degree of cleanliness and different roughness, so that the mechanical properties of the workpiece surface is improved, thus improving the fatigue resistance of the workpiece, increased it And the adhesion between the coating to extend the durability of the coating, but also conducive to the leveling and decoration of the paint.


Is through the grinding product in the workpiece surface to form a line pattern, play a decorative effect of a surface treatment means. According to the different lines after drawing can be divided into: straight wire drawing, chaos drawing, ripple, spin pattern. Surface drawing processing is through the grinding product in the workpiece surface to form a line pattern, play a decorative effect of a surface treatment means. As the surface drawing processing can reflect the texture of metal materials, so get more and more users love and more and more widely used.

four. Anodized

An electrolytic oxidation process in which the surfaces of aluminum and aluminum are usually converted to an oxide film which is protective, decorative and otherwise functional. The anodic oxidation of aluminum from this definition only includes the process of generating anodic oxide film. An oxide film is formed on the surface of the metal or alloy as an anode by electrolysis. Metal oxide films change the surface state and performance, such as surface coloring, improve corrosion resistance, enhance wear resistance and hardness, protect the metal surface. Such as aluminum anodizing, aluminum and its alloys placed in the corresponding electrolyte (such as sulfuric acid, chromic acid, oxalic acid, etc.) as the anode, under specific conditions and external current, the electrolysis. The anode of aluminum or its alloy oxidation, the surface of the formation of alumina thin layer, the thickness of 5 to 30 microns, hard anodic oxide film up to 25 to 150 microns. Anodized aluminum or its alloys, improve its hardness and wear resistance, up to 250 ~ 500 kg / mm2, good heat resistance, hard anodized film melting point up to 2320K, excellent insulation, Wear voltage up to 2000V, enhanced corrosion resistance, in the ω = 0.03NaCl salt spray after thousands of hours without corrosion. The oxide film has a large number of micropores, can absorb a variety of lubricants, suitable for the manufacture of engine cylinders or other wear parts; membrane microporous adsorption capacity can be colored into a variety of beautiful and beautiful colors. Non-ferrous metals or their alloys (such as aluminum, magnesium and their alloys, etc.) can be anodized, this method is widely used in mechanical parts, aircraft parts, precision instruments and radio equipment, daily necessities and architectural decoration and so on. In general, the anode is made of aluminum or aluminum alloy as the anode, the cathode is selected lead plate, the aluminum and lead plate together with the solution, which there are sulfuric acid, oxalic acid, chromic acid, electrolysis, aluminum and lead Of the surface to form an oxide film. Among these acids, the most extensive is anodic oxidation with sulfuric acid.


Monochrome, gradient color: polishing / sandblasting / drawing → degreasing → anodizing → neutralizing → dyeing → sealing → drying

Color: ① polishing / sandblasting / drawing → degreasing → shielding → anodizing 1 → anodic oxidation 2 → sealing → drying

② polishing / sandblasting / drawing → degreasing → anodizing 1 → laser engraving → anodizing 2 → sealing → drying