Surface Treatment

Surface Treatment for Machined Parts

Many machined parts requires surface treatment. In the simplest case, the machined parts are just anti-oil rust painted. However, in many cases, machined parts require various surface treatments. The purpose is to prevent corrosion, improve the hardness of the surface and have better decoration. Our factory cooperates with dozens of surface treatment plants in the city. We can provide stainless steel surface treatment, aluminum surface treatment, etc.

Stainless steel Surface treatment

Because stainless steel material has good corrosion resistance, Normally, Full-machined stainless steel parts do not require any surface treatment, but stainless steel castings, forging parts require surface treatment, There are several surface treatment for stainless steels:


Passivation process using an acid solution to remove contaminants and form a new passivation film on the surface. Commonly used in stainless steel castings or deep drawing products,

The advantages of passivation are: Remove rust and get a uniform color on the surface

stainless steel surface treatment the passivation

After passivation, the surface of the beer can has a beautiful white matte color.


Polishing is a major stainless steel surface treatment process, We can provide mirror polishing or Satin finish.  These years, We have produced a lot of stainless steel casting parts with the polishing finish, like handrail parts, food processor parts.

stainless steel surface treatment polishing finish


Electropolishing, also called electrochemical polishing, is an electrochemical procedure that removes material from metal products. Compare to traditional polishing, Electropolishing has the following advantage:

  1. Can polishing small or complex shape parts.
  2. High production efficiency and low cost.
  3. Increase surface corrosion resistance

Sandblasting and Electropolishing

In order to meet customer’s requirement, Now we can do complex,multi-factory collaboration surface treatment like sandblasting and electropolishing.

Sandblasting is the process of smoothing, shaping and cleaning a hard surface by forcing solid particles across that surface at high speeds.

When sandblasting and electropolishing combined, We can get a better, shiny surface than pure electropolishing.

stainless steel surface treatment sandblasting and electropolishing

Aluminum Surface treatment

Commonly used aluminum surface treatment processes are Anodizing, Powder Coating, Painting, sandblasting, Polishing. Our factory is familiar with anodizing and powder coating treatment of aluminum machined parts.


Anodizing is an electrolytic passivation process used to increase the thickness of the native oxide layer on the surface of a metal part. Aluminum anodizing is very common in China, So we can provide black, natural, gold, red, … anodized.

aluminum parts with anodizing treatment

Powder Coating

Powder coating is to spray the powder onto the surface of the workpiece by a powder spraying device, After high-temperature baking, Then the powder is dried and solidified into a film.

Because aluminum alloys for die casting process are not suitable for anodizing treatment,  So powder coating is widely used in aluminum die-casting products.

Iron & Carbon steel Surface Treatment

Different from the stainless steel surface treatment, Because iron and carbon steel are easy to rust,  Their surface treatment is more concerned about the anti-rust problem. We mainly do the following surface treatment:

  1. Plating(Zinc,Nickel,Gold,Silver,Chrome,Oxidize,etc)
  2. Painting
  3. Alodine/Chelfilm
  4. Teflon coat

Our surface treatments enable us to provide you with high quality machined parts. We can provide surface treatments for a wide range of materials, from stainless steel surface treatment to aluminum or iron finishes. More and more customers benefit from our wide range surface treatment services. Together with our machining and heat treatment capabilities, our surface treatment capabilities make us your “one-stop” CNC machining supplier.