Surface Treatment of Metals and Plastics (STM)

Surface treatment of metals and plastics is also called STM. It is a method to artificially forming a surface layer on the base material. The mechanical, physical and chemical properties of the STM layer is quite different with the base material. The purpose of surface treatment is to meet the corrosion resistance, wear resistance, decoration or other special functional requirements of the product. For metal castings, our more commonly used surface treatment methods are mechanical grinding, chemical treatment, surface heat treatment, and surface spraying. Surface treatment is to clean, sweep, deburr, degrease, and descale the surface of the workpiece.


Anodizing means to utilize the theory of oxidation,which uses electrolytic oxidation treatment to generate alumina, itself spontaneously generates a colored anodized film, with anti-corrosion, anti-oxidation function.

Aluminum anodized film can be divided into two types: barrier type and porous type. The dense barrier type oxide film can be obtained by anodizing in nearly neutral electrolyte. This kind of film has good insulation and can be used to make devices such as capacitors


  • Improved corrosion resistance.

  • Increased durability and wear resistance.

  • Enhanced electrical insulation.

  • Improved adhesion for coatings and paints.

Black Oxide

Black Oxide principle is to produce a layer of oxide film on the metal surface to isolate the air,then achieve the purpose of anti-rust.When the appearance requirements are not high, blackening can be used. The surface of steel can be blackened.


  • High degree of corrosion protection.

  • Resistant to wear and abrasion.

  • Offers sleek and uniform appearance to metal surfaces.


Brushing is to form lines on the surface of the work piece by grinding. Because brush can reflect the texture of metal materials, it is more and more widely used.


  • Improve the appearance of metal surfaces.

  • Increase parts’ resistance to corrosion, wear, and tear.

Chemical Film

Our chemical film processes are RoHS compliant. It’s typically used on machined aluminum parts. The film reduces corrosion and adds an appealing metallic coloring to the aluminum substrate. It also helps resist scratching, acting as a natural electrical insulator. At present, it is one of the most durable finishes available.


  • Provides excellent resistance against corrosion.

  • Improves the electrical conductivity of the treated metal parts.

Chrome Plating

Due to the excellent properties,chromium plating layer is widely used as the outer layer and functional coating of protective and decorative coating system, and has always played an important role in electroplating industry


  • High resistance to wear and tear.

  • Good conductibility.

  • Excellent anti-corrosion properties.

  • Adds a visual appeal to the metal object.

Nickel Plating

Nickel plating surface finishing is a process of electroplating a thin layer of nickel onto a metal surface. The process is widely used in various industries.


  • Excellent corrosion resistance.

  • Improve the aesthetic appearance of metal parts.

  • Less prone to scratching and wear.


Painting is done to prevent the surface from rust, as well as to enhance its appearance. Various texture and color is feasible.


  • Add shine and durability.

  • Ensure maximum protection and longevity.


Passivation is involved in the formation of a thin layer of oxide on the surface of the metal alloy, which protects it from exposure to harsh chemicals and environmental factors that could damage it.


  • Improves the physical appearance of the metal.

  • Maintains its integrity and prolongs its lifespan.


Polishing surface finishing is a critical process that involves the use of polishing compounds and abrasives to enhance the final appearance and texture of an object. The process involves the removal of tiny imperfections on the surface, such as scratches, pitting or other defects.


  • Improved aesthetic appeal, functional properties, and longevity.

  • Make it safer to handle.

  • More resistant to corrosion, scratches, wear, and tear, and can withstand harsh environmental conditions.

Powder Coating

Powder coating applys an electrostatically charged, dry powder coating to a metal surface. The powder coating is then baked or cured, creating a smooth and durable finish that resists chipping, scratching, and fading.


  • Environmental friendliness.

  • Reduce waste.

  • Cost-effective process.

  • Superior durability.


Sandbalsting includes cleaning and shaping of a surface by directing a high-velocity stream of abrasive materials towards it. Sandblasting can be used to remove rust, scale, and any other imperfections that may be present on the surface.


  • The process of sandblasting is quite simple.

  • Clean, smooth surface that is free from any imperfections.

Silk Screening

Silk screen can be used to create multi-colored designs or patterns on a wide variety of materials. The process can also be used to create textures or other visual effects that can add depth and interest to the surface of the material.


  • Silk Screening is an ideal surface finishing technique for projects.

  • Require a high degree of accuracy, visual impact, or durability.

Zinc Painting

Zinc painting is a way of surface finishing that involves the application of zinc-rich primer on a metal surface. It is considered one of the most effective ways of protecting metal from corrosion. The process of zinc painting involves the application of a primer that contains between 60 to 80% zinc powder by weight.


  • Zinc painting can be used in a variety of different environments.

  • Zinc painting is a cost-effective way of protecting metal surfaces from corrosion.

  • Zinc painting is also an environmentally friendly solution.