How many of the 20 common surface treatment methods do you know?
Created date: 2022-03-29

Surface treatment is a process of artificially forming a surface layer with different mechanical, physical and chemical properties from the substrate on the surface of the substrate material. The purpose of surface treatment is to meet the requirements of corrosion resistance, wear resistance, decoration or other special functions of products.  

Today, we will introduce 10 common surface treatment methods:


01 Polishing

Polishing refers to the processing method of reducing the surface roughness of the workpiece by mechanical, chemical or electrochemical action to obtain a bright and flat surface. It is the modification processing of the workpiece surface by using polishing tools, abrasive particles or other polishing media.  

 

Polishing can not improve the dimensional accuracy or geometric accuracy of the workpiece, but for the purpose of obtaining a smooth surface or specular gloss. Sometimes it is also used to} eliminate the gloss (extinction).  

 

Usually the polishing wheel is used as the polishing tool. The polishing wheel is generally made of multi-layer canvas, felt or leather, clamped on both sides with metal circular plates, and its rim is coated with polishing agent uniformly mixed by micro powder abrasive and grease.

 

During polishing, the high-speed rotating polishing wheel (with a circumferential speed of more than 20m / s) is pressed against the workpiece to make the abrasive roll and micro cutting on the workpiece surface, so as to obtain a bright machined surface, and the surface roughness can generally reach Ra0 63 ~ 0.01 μ m; When non greasy matting polishing agent is used, the bright surface can be matting to improve the appearance.

 

For different polishing processes: rough polishing (basic polishing process), medium polishing (finishing process) and fine polishing (polishing process), selecting appropriate polishing wheels can achieve the best polishing effect and improve the polishing efficiency at the same time.  

 

02 Sandblasting

The process of cleaning and roughening the substrate surface by using the impact of high-speed sand flow.

The compressed air is used as the power to form a high-speed jet beam to spray the spray material (copper ore, quartz sand, carborundum, iron sand and Hainan sand) to the workpiece surface to be treated at high speed, so as to change the appearance or shape of the outer surface of the workpiece surface.

 

Due to the impact and cutting effect of abrasive on the workpiece surface, the workpiece surface can obtain certain cleanliness and different roughness, and the mechanical properties of the workpiece surface can be improved. Therefore, it improves the fatigue resistance of the workpiece, increases the adhesion between it and the coating, prolongs the durability of the coating film, and is also conducive to the leveling and decoration of the coating.