Introduction to the treatment method of stainless steel surface

Introduction to the treatment method of stainless steel surface

The surface of stainless steel is processed by different methods to make the surface of stainless steel have different luster, colors, patterns, etc., to improve the appearance of stainless steel and achieve aesthetic effects.

In addition, surface processing has important functions. For example, a smooth stainless steel surface not only looks clean, but in a corrosive environment, the smoother the surface, the better the corrosion resistance. In the processing of stainless steel products (such as deep drawing), the strength is increased by cold pressing patterns, so that the lines on the metal surface are slightly rough to catch the grease. A proper amount of grease can reduce tool wear and reduce tool indentation. The surface processing and coating of the wire is for the convenience of further processing.

Stainless steel surface processing is usually divided into two categories. One type is rolling surface processing, the surface obtained by using different production processes; the other type is deep processing of stainless steel surface, in order to change the surface level or properties.

Rolled surface processing

The stainless steel plates and strips produced by rolling mills generally undergo processes such as hot rolling, cold rolling, annealing, pickling, and finishing. Because the surface of cold-rolled stainless steel strip occupies a special position in use, the surface processing of cold-rolled stainless steel strip is divided into different surface processing types (or grades) according to different process methods. Stainless steel plate and strip, especially cold-rolled steel and steel strip, have a variety of surface processing types. National standards have corresponding regulations, such as common 2B, No.1, and BA surfaces.

Deep processing of stainless steel surface

Electroplating and evaporation surface

The surface of stainless steel is covered with a layer of wear-resistant, scratch-resistant, and corrosion-resistant coating by electroplating to improve the surface properties of stainless steel. In order to make the covering layer and the metal matrix firmly bond, different methods can be used to pretreat the surface to remove the oil and rust on the surface. The advantage of electroplating is that it has almost no effect on the microstructure of the base material. The common surface chromium plating and nickel plating treatments are mainly used for artwork and decoration.

Electropolished surface

The principle of electrolytic polishing is opposite to that of electroplating. Instead of depositing chromium or nickel on the substrate, it uses stainless steel as the anode and uses a specially formulated electrolyte to etch away a thin layer of 2-40PM on the surface of the stainless steel. Make the metal surface have excellent corrosion resistance and look smooth, clean and shiny.

Mechanical polishing

Mechanical polishing is the use of abrasive belts, polishing wheels, grinding wheels or other tools to grind the surface of stainless steel to obtain corresponding surface effects. The effects of mechanical polishing usually include snow wheels, filaments, lotus patterns, matte, and mirror surfaces.

Surface painting

Paint on the surface of stainless steel is a way to protect stainless steel from oxidation and corrosion. The corrosion phenomenon that occurs around us refers to the damage of various materials under the action of the environment (the combined effect of chemical, electrochemical and several physical factors), performance degradation or state deterioration. However, spraying paint on the surface of stainless steel is a very important anti-corrosion maintenance method. A good spray paint protection layer remains continuous and undamaged, and the combination is good, which can become a barrier to inhibit the invasion of corrosive media.