• June 21, 2024
  • Shatou, Changan, Dongguan, CN
metal polishing

Types of metal polishing technology and its polishing steps

Metal polishing technology is a method widely used in the surface treatment of metal products, the purpose of which is to improve the appearance quality and smoothness of metal products. In metal polishing, common techniques include various methods such as mechanical polishing, chemical polishing and electrolytic polishing. Each method has its unique polishing steps and scope of application. The types of metal polishing techniques and their polishing steps will be introduced in detail below.

The types of metal polishing techniques are as follows:

1. Mehanical polishing: Use mechanical equipment, such as grinding wheels, abrasive tools, etc., to grind, polish, and polish metal.

2. Chemical polishing: Use specific chemical preparations to chemically react with the metal surface to dissolve or transform the oxide layer, dirt, etc. on the metal surface, making it smoother and brighter.

3. Electrolytic polishing: Through electrolysis, using electrolyte and electric current, the metal oxide layer, dirt, etc. are dissolved to achieve the effect of polishing.

4. Electrochemical polishing: Combining electrochemical and chemical polishing technology, under specific electric field conditions, using a specific electrolyte, it can remove the oxide layer on the metal surface and improve the gloss.

5. Magnetic polishing: Utilize the action of the magnetic field, under a specific magnetic field, through the magnetic properties of the abrasive material, to complete the polishing of the metal surface.

6. Liquid polishing: Use a specific liquid polishing agent to polish the metal surface by hand-painting or spraying.

The steps of 3 common metal polishing techniques:

1. Mechanical polishing:

a. Coarse grinding: Use grinding paper or grinding wheel to grind the uneven thickness or rough part of the metal surface until the surface is smooth.

b. Medium grinding: Use medium sandpaper or fine grinding wheels to remove the wear marks and blemishes that may be left during the coarse grinding process, and achieve a brighter surface effect.

c. Fine grinding: Use fine sandpaper or polishing wheels to gradually reduce the size of the abrasive particles to further improve the smoothness and brightness of the surface.

d. Polishing: Use a polishing wheel with a polishing paste, apply the polishing paste on the metal surface, and then polish by rotating the polishing wheel to obtain a high gloss on the metal surface.

2. Chemical polishing:

a. Cleaning: Use a detergent or solvent to remove dirt and oxides from the metal surface to ensure a clean surface.

b. Chemical polishing agent coating: apply appropriate chemical polishing agent evenly on the metal surface.

c. Reaction: Let the chemical polishing agent react with the metal surface at a certain temperature and time to remove oxides and uneven parts on the surface.

d. Cleaning: Clean the chemical polishing agent and reaction products with water or solvent to ensure that the metal surface is clean.

3. Electropolishing:

a. Cleaning: Use a detergent or solvent to remove dirt and oxides from the metal surface to ensure a clean surface.

b. Electrolyte configuration: according to the required polishing effect, configure appropriate electrolyte, such as sulfuric acid, nitric acid, etc.

c. Polishing electrolysis: The metal is used as the anode, and the electrolytic polishing is carried out in the electrolyte, and the oxide and uneven parts on the metal surface are removed through the electrolytic reaction.

d. Cleaning: Wash the electrolyte with water or solvent to ensure that the metal surface is clean.

General precautions during polishing:

When using polishing, wear safety protective equipment, such as gloves, goggles, etc., to avoid damage to people or the environment.

1. Control strength:

During the polishing process, it is necessary to master the appropriate strength and speed to avoid excessive grinding or damage to the metal surface.

2. Choose the right materials and tools:

Choose the right grinding materials and tools according to different metals and polishing requirements to avoid unnecessary damage to the metal.

3. Cleaning and maintenance:

After polishing, the metal surface needs to be cleaned and maintained to avoid re-oxidation or contamination of the surface.


Metal polishing technology is an effective way to improve the surface quality of metal products. Different polishing technologies have their own unique process steps and scope of application. In practical applications, it is necessary to choose the appropriate method according to the characteristics and requirements of the metal material. Through the correct polishing process, metal products can get a good appearance and finish, thereby increasing their value and service life.


What are the best materials for polishing metal?

One of the best materials for polishing metal is aluminum oxide (Al2O3) or corundum. Aluminum oxide has high hardness and anti-wear properties, and can effectively polish and grind metal surfaces.

How to polish metal to a high gloss?

Smooth the metal surface with sandpaper or abrasives, then polish it to a high sheen with a metal polish and polishing machine.

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