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  • Catalytic metal surface treatment - Oxidation
Catalytic metal surface treatment - Oxidation

Catalytic metal surface treatment - Oxidation

  • Surface treatment of metal parts
  • Metal surface treatment method
  • Metal Products surface treatment
  • Metal plate surface treatment
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Plating / electrophoresis / zinc plated / black / metallic surface shading / Shot / blasting / shot / phosphate / passivation
plating
Insoluble coating metal or other material as the anode, a cathode workpiece to be plated, plating metal cations to be plated in the surface is reduced to form the coating. To exclude interference from other cations, and the coating uniformity, firm, needed a solution containing the plating metal cations do plating solution in order to maintain a constant concentration of plated metal cation. The purpose plating is plated with a metal coating on a substrate, the substrate surface to change the nature or size. Metal plating can enhance corrosion resistance (coating metal more corrosion-resistant metal), increased hardness, to prevent wear and improve the electrical conductivity, lubricity, heat resistance, and surface appearance.
Electrophoresis
Electrophoresis is an electrophoretic paint in the Yin and Yang, the voltage applied to the role, the coating of electrically charged ions move to the cathode, and the basic role of the cathode surface arising from the formation of insoluble material, deposited on the surface.
Features electrophoresis surface treatment processes:
Electrophoretic coating film has plump, uniform, smooth, smooth advantages electrophoretic film hardness, adhesion, corrosion resistance, impact resistance, permeability is superior to other coating processes.
Electroplating and electrophoresis difference
Electroplating is to use the principle of electrolysis in some metal surface coated with a thin layer of process other metal or alloy.
Electrophoresis: a solution of charged particles (ions) move in an electric field phenomenon. Solution of charged particles (ions) move in an electric field phenomenon. The use of charged particles in an electric field to achieve the separation of different moving speed technique called electrophoresis.
Electrophoresis aka - power forward (forward), swimming paint, electrodeposition.
Galvanization
Galvanized refers metal, alloy or other material surface layer of zinc plating in order to play beautiful, rust and other effects of surface treatment technology. Now the method is mainly used in hot-dip galvanizing.
Nigrescence
Black surface treated steel parts, but also called bluish. The principle is the rapid oxidation of the surface of iron and steel products, so as to form a dense protective oxide film layer, to improve the ability of anti-rust steel parts.
Blackened now commonly used methods of conventional alkaline heating blackening and the appearance of two black late at room temperature.
But for low temperature oxidation process carbon steel is not very good. A3 steel with a basic black better.
At a high temperature (about 550 ℃) three tetroxide oxidation of iron was sky blue, so called blueing. At low temperature (about 3 50 ℃) iron oxide formed was dark black, so called black handle. In weapons manufacturing, the commonly used treatment is blue; in industrial production, commonly used is blackened.
Alkaline or acidic oxidation oxidation; the metal oxide film formed on the surface to prevent corrosion of the metal surface, this process is called "blue." Black metal surface by "bluing" oxide film formed by post-treatment, the outer layer is mainly iron oxide, iron oxide lining.
Blue (black) Operating procedures:
Workpiece clamping → degreasing → washing → pickling → washing → oxidation → washing → → hot boiled saponification wash → Check.
The so-called saponification, with a soapy water solution to soak the workpiece at a certain temperature. The purpose is to form a layer of iron stearate film, in order to improve the corrosion resistance of the workpiece.
Metal surface coloring
Metal surface coloring, by definition is to the metal surface, "painted" on the color, changing its single, cold metal color, colorful instead, to meet the different needs of different industries.
Usually after coloring to the metal have increased corrosion resistance, abrasion resistance and some also increased. But the main application surface color technology is still decorated areas, namely, to beautify life, beautify the community.
Shot
Shot with the principle of rotation of the motor drives the impeller body (direct drive or V-belt drives), by centrifugal force, the diameter of about 0.2 to 3.0 of the projectile (with steel balls, different steel cut wire shot, stainless steel balls type) thrown to the workpiece surface, the surface of the workpiece reaches a certain roughness of the workpiece to become beautiful, or change the welding work tensile stress is compressive stress, improve the life of the workpiece. By increasing the surface roughness, but also improve the workpiece subsequent paint film adhesion.
Sandblasting
Sandblasting is the use of compressed air as the driving force, to form a high-speed jet bundle the spray material (copper sand, quartz sand, emery

Inhalation blasting schematics
, Iron ore, Hainan sand) high-speed jet to the surface to be treated, so that the appearance or shape of the outer surface of the workpiece surface changes, due to impact and cutting action of abrasive on the surface, so the surface of the workpiece to obtain a certain cleanliness and different roughness, the mechanical properties of the workpiece surface is improved, thereby increasing the fatigue resistance of the workpiece, and it increases the adhesion between the coating to extend the durability of the coating, but also conducive to flow and decorative coatings .
Blasting technology and other clean-up processes (such as pickling, tool cleaning) compared with the following characteristics:

First, sandblasting is the most thorough, most versatile, most rapid and most efficient cleaning method.
Two, sandblasting can choose between different roughness, and other processes is no way to achieve this. Hand-polished matte side can play, but too slow, chemical solvents to clean the surface is too smooth is not conducive to clean coating adhesion.
Shot features:
1, the flexibility of the big clean-up. The inner and outer surfaces of the inner wall easily and fittings cleaning complex parts; and unlimited space, you can move it to a nearby large workpiece cleaning.
2, the device structure is simple, low overall investment, less wearing parts, low maintenance costs.
3, consumption of energy, must be equipped with high-powered Air Station
4, easy to clean the surface of moisture, it is easy to rust.
5, cleaning efficiency is low, the operating personnel, labor-intensive.


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