What is the stainless steel surface treatment method

Commonly used stainless steel surface treatment technology has the following processing methods: surface whitening treatment; surface mirror bright treatment; surface coloring treatment. Surface color whitening treatment: stainless steel in the processing process, through the rolled plate, tie edge, welding or after artificial surface fire baking heating treatment, resulting in black oxide skin. This hard gray-black oxide skin is mainly NiCr2O4 and NiF two EO4 components, before the general use of strong corrosion method to remove. But this method is costly, polluting the environment, harmful to human body, corrosive, gradually eliminated.

Stainless steel surface mirror bright processing methods: according to the complexity of stainless steel products and user requirements of different situations can be used respectively mechanical polishing, chemical polishing, electrochemical polishing and other methods to achieve a mirror luster.

Surface coloring treatment: stainless steel coloring not only gives stainless steel products a variety of colors, increase the variety of products, but also to improve product wear resistance and corrosion resistance.

Stainless steel surface rust treatment methods

Physical rust

1, physical rust: coating rust oil, paint, surface plating, plastic spraying, gluing and so on, a few common belong to the physical nature of the rust prevention methods.

2, physical rust performance: after physical rust treatment of stainless steel surface will have more or less changes, such as electrical conductivity, thermal conductivity, welding and so on.

3, physical rust process: physical rust process is very complex (such as electroplating), some are very simple (such as anti-rust oil).

4, the effect of physical rust prevention: 304L stainless steel, for example, after physical rust prevention treatment of 304L stainless steel can complete 48 hours of salt spray test.

Chemical antirust (passivation)

1, chemical antirust (purification): chemical antirust (purification) is stainless steel after oxidizing medium treatment to reduce the corrosion rate.

2, chemical antirust (purification) role: the formation of dense passivation film on the surface of stainless steel to meet the demand for corrosion resistance.

3, chemical rust prevention (passivation) performance: stainless steel after passivation treatment, will not change the color of the stainless steel surface and its own size, the performance of the stainless steel itself has no effect.

4, chemical antirust (passivation) process: chemical antirust (purification) process is relatively convenient compared to the physical rust, but also a lot simpler, only need to soak for a few hours, but also according to the actual situation of different types of stainless steel passivation treatment.

Common passivation process: degreasing and degreasing - water - passivation - neutralization - water - drying. Water - drying.

5, chemical rust (passivation) effect: 304L stainless steel, for example, 304L stainless steel after passivation treatment salt spray test can be up to 240 hours.

Some of the shortcomings of physical rust prevention are very obvious, compared with chemical rust prevention performance is far better than physical rust prevention. However, physical rust prevention can color the surface of stainless steel and improve its aesthetics. Both methods of rust prevention have their own advantages and disadvantages, and the choice of which method of rust prevention ultimately depends on the needs.