Metal Finishing is a process that artificially forms a surface layer on the surface of a substrate that has different mechanical, physical and chemical properties from the substrate. The purpose of the Metal Finishing is to meet the corrosion resistance, wear resistance, decoration or other special functional requirements of the product. For metal castings, we commonly use Metal Finishing methods such as machine polishing, chemical treatment, surface heat treatment, and spray coating. Metal Finishing is to clean, sweep, deburr, degrease, descale, etc. to the surface of the workpiece.
Trivalent Chromium Zinc Plating
As the most basic type of surface treatment process to be carried out on metals, alloys, or other materials, trivalent chromium plating is widely applicable across a diverse range of products, and comes in a variety of colors.
It also provides added value, such as an aesthetically pleasing glossy appearance, protects the base metal against corrosion and wear, improves electrical conductivity, lubrication, surface strength, thermal resistance, weather resistance, and the prevention of carburization or nitriding during heat treatment.
● Highly uniform coating thickness
● Glossy finish
● Good corrosion resistance
● Plating thickness: 3um - 20um
The electroplated nickel layer has high stability in air. Due to its strong passivation ability, metallic nickel can rapidly form a very thin passivation film on the surface, which is resistant to atmospheric, alkali and certain acid corrosion.
Electroplated nickel crystals are extremely fine and have excellent polishing properties. The polished nickel coating gives a mirror-like finish and maintains its luster for a long time in the atmosphere. Therefore, the plating layer is often used for decoration.
The nickel plating layer has a relatively high hardness and can improve the wear resistance of the surface of the product.
Hard chrome plating
In addition to the hard chrome plating technology commonly used in the maintenance of new equipment, hard chrome plating must be plated for a long time before grinding, and a layer of protective layer will be formed on the surface of the machine during the plating process. One thousand microns is enough to repair the worn parts of the Middle Ages. After grinding, it is like new, even more durable than new ones. Hard chrome is used in high-precision mechanical parts, such as piston rods, oil pressure shooters, mirror rollers, embossing rollers, printing rollers and drying cylinders....
The surface of the coating is hard and hard-wearing.
The surface of the coating is bright and beautiful.
Can increase the strength of the metal being plated and has excellent heat resistance.
The coating thickness is uniform and can be controlled from 1 to 100 μm.
The adhesion of the plating substrate is high.
The purpose of stainless steel passivation is to "really increase the corrosion resistance of stainless steel parts." Stainless steel passivation allows stainless steel workpieces to have superior corrosion resistance. The reaction mechanism of stainless steel passivation operation does not actually have a general statement. But one thing is certain is that there is a protective oxide film on the surface of passivated stainless steel. This invisible film is considered to be very thin, less than 0.0000001 inches in thickness, which is approximately 1/100,000 of human hair. Finished, polished, or pickled stainless steel workpieces will automatically acquire the oxide film by exposure to atmospheric oxygen. Under ideal conditions, the protective oxide film completely covers all surfaces of the part.
Anodizing technology is a process in which aluminum and its alloys are cast or extruded to make hair color and protective film. This layer of protective film can make aluminum weather resistant and oxidation resistant. Durable. The hard film anode treatment is to hang the workpiece on the anode and place it in a low-temperature electrolyte. An electric current is forced on the surface of the aluminum alloy to produce a highly ceramic-like oxide film. This oxide film has the characteristics of corrosion resistance, wear resistance, and insulation at the same time and has been widely used in various industries.
1. Corrosion resistance
2. Paint adhesion
3. Decorative appearance
4. Abrasion resistance
Electrophoretic Coating (E-Coating)
When combined with the principles of plating, the special electrophoretic coating agent delivers superior coating uniformity. The absence of hexavalent chromium does not burden the environment. E-coating is thinner compared to zinc-aluminum coating, and the uniform coating gives the product a high gloss finish for a glossy black appearance. As for function, the composite coating provides superior resistance to corrosion and greatly reduces the problem of clogged holes due to non-uniform coverage. Recommended for fasteners that require high resistance to corrosion and a beautiful finish.
● Glossy black finish
● Environmentally friendly
● No clogging of holes
● Superior resistance to white rust
● Coating thickness: 8um - 20um
Sand Blasting or Peening is an industry-used metal pretreatment process. The Sandblasting Principle impacts the accelerated abrasive particles on the metal surface to achieve rust removal, dehairing, deoxidation or surface treatment... Etc., can change the finish of the metal surface.
The so-called Dry Sandblasting is a method in which the abrasive is conveyed by a vacuum tube, and the jet force is ejected by the compressed air to accelerate the jet and the workpiece is subjected to a surface treatment. The concept of dust countermeasures that have been taken into consideration to change the concept of conventional sand blasters is a highly sanitary blasting device. It is most suitable for surface processing of work that is not suitable for water.
● Because it is dry, it does not need to be dry after blasting, and it does not concern rust.
● The removal of the burrs (surface projections) and the attachments on the surface can be removed and washed without damage to the processed article.
● Uniform plowing ground (speckled pattern) processing, especially in the surface roughness requirements of the processing power.
● Because it does not require waste liquid treatment, it is easy to repair.
● Compared with the sprayer, the machined surface is not rough.
Phosphate Coating is a traditional process widely used in metal pretreatment. It is a process in which phosphate reacts with a metal matrix to form a phosphate chemical conversion film on the surface. This phosphate conversion film is called phosphating. membrane. The main purpose of phosphating is to provide short-term process protection for the base metal, to prevent corrosion of the metal matrix to a certain extent, to be used for primer before painting, and to improve the adhesion and corrosion resistance of the paint film coating. Phosphating technology is widely used in pre-painting processes in the automotive, home appliance, and machinery industries.
The main advantages of phosphate treatment
● Phosphate film is porous, the paint can penetrate into these pores, pull the metal by mechanical force, and thus can improve the adhesion of the coating.
● Phosphating film can make the metal surface from a good conductor to a bad conductor, thus inhibiting the formation of microbatteries on the metal surface, effectively impeding the corrosion of the coating, and significantly improving the corrosion resistance and water resistance of the coating.
● Phosphating film can be used for metal forming, lubrication and anti-embroidering, in addition to the underlying layer of the coating.