Problems in surface treatment and processing of stainless steel

Stainless steel products adopt surface treatment process

Grinding: manual and mechanical grinding is adopted, which mainly deals with cutting defects, weld defects, riveting and welding points during riveting and various scratches during processing.

Weld pickling: weld pickling passivation, mainly dealing with the black oxide skin at the weld.

Overall passivation: overall pickling passivation mainly deals with products with the same overall requirements, but at present, this treatment method is difficult to achieve the desired consistent effect.

Polishing and passivation: pickling and passivation treatment after manual polishing, mainly for products with decoration requirements, but the current treatment method is difficult to achieve better treatment effect, and the material cost and labor cost are relatively high.

Stainless steel pipe fittings

Stainless steel pipe fittings

Problems in the processing of stainless steel products

Weld defect: the weld defect is relatively serious. Manual and mechanical grinding is used to make up for it. The grinding trace will cause uneven surface and affect the appearance.

Surface inconsistency: only pickling and passivation are carried out for the weld, which also causes uneven surface and affects the appearance.

Scratches are hard to remove: overall pickling and passivation can not remove all kinds of scratches produced in the processing process, and also can not remove carbon steel, splashes and other impurities adhering to the stainless steel surface due to scratches, welding splashes, resulting in chemical corrosion or electrochemical corrosion and rust in the presence of corrosive medium.

Uneven grinding, polishing and passivation: pickling and passivation treatment is carried out after manual grinding and polishing. For workpieces with large area, it is difficult to achieve uniform treatment effect and can not get ideal uniform surface. And the cost of working hours and auxiliary materials is also high.

Pickling capacity is limited: pickling passivation paste is not universal. It is difficult to remove the black oxide scale produced by plasma cutting and flame cutting.

Scratches caused by human factors are serious: in the process of hoisting, transportation and structural processing, scratches caused by collision, dragging, hammering and other factors are serious, which makes the surface treatment more difficult, and is also the main cause of corrosion after treatment.

Equipment factor: in the process of profile and plate bending, scratches and creases are also the main causes of corrosion after treatment.

Other factors: during the purchase and storage of stainless steel raw materials, the bumps and scratches caused by hoisting and transportation are also serious, which is also one of the causes of corrosion.

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