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What are the processes of surface treatment of stainless steel products

What are the processes of surface treatment of stainless steel products?


Technology of surface treatment of stainless steel products has many kinds, such as electroplating, anodizing, painting, sandblasting, pickling, passivation, oil degreasing, rust etc.. Three common stainless steel products surface treatment process is as follows:

A, stainless steel passivation

The surface recommended for this process must be free of iron. The presence of stainless steel particles on the surface of any iron, cast iron, low carbon steel, medium carbon steel or low alloy steel will promote the pitting of the "free" iron and stainless steel on its surface. This is a very serious problem, so passivation is only used for the treatment of stainless steel and stainless steel. The main purpose of stainless steel passivation is to prevent the oxidation and corrosion of stainless steel surface.

B, stainless steel pickling

The purpose of stainless steel pickling is to remove the surface of the stainless steel surface after high temperature welding, heat treatment or hot working. At the same time, it can eliminate the corrosion of steel or iron or steel particle pollution. Note that if the acid is not cleaned after pickling, the surface will soon begin to rust. Resulting in lower corrosion resistance of the steel surface layer below.
Stainless steel pickling process can be applied to all 200, 300, 400 series of stainless steel surface treatment. All pickling operations lead to the removal of impurities on the surface of the metal while a slight change in the size of the result, so as a result, to some extent an extinction of visual brightness may also be a significant reduction in size.
The heat treatment in vacuum or a well controlled atmosphere, such as bright annealing, eliminates the need for pickling, which usually makes the stainless steel get a better light cleansing.

C, stainless steel cleaning agent degreasing degreasing

Stainless steel surface treatment products before any treatment process must first remove grease, cutting fluid, drawing compounds and other lubricants, before the final passivation treatment or surface heat before it can be stainless steel parts processing. Stainless steel parts must also be a step forward for degreasing assembly by welding, to prevent the pickup of carbon at high temperature.
Under normal circumstances, the use of stainless steel cleaning agent (number CA-Q03), only need to soak at room temperature for 1-8 minutes to remove any oil, simple operation, low labor intensity, can be repeated use of the cycle, effectively reduce production costs. In cleaning operations with other metals, the cleaning rate can be increased by using the process of brushing, spraying or mixing.