1. Welding seam defects: Welding seam defects are more serious, and manual mechanical polishing is used to make up. The resulting polishing marks will cause uneven surface and affect appearance.
2. Inconsistent surface: only pickling and passivation of welds will also cause uneven surface and affect appearance.
3. Scratches are difficult to remove: the overall pickling passivation, and can not remove all kinds of scratches produced during the processing, and can not remove carbon steel, splashes and other impurities that adhere to the stainless steel surface due to scratches and welding spatter. , Resulting in chemical corrosion or electrochemical corrosion and rust in the presence of corrosive media.
4. Uneven grinding and polishing passivation: pickling passivation after manual grinding and polishing, it is difficult to achieve a uniform treatment effect for a workpiece with a large area, and an ideal uniform surface cannot be obtained. And the cost of working hours and auxiliary materials are also higher.
5. The pickling capacity is limited: pickling passivation paste is not a panacea. It is difficult to remove the black oxide scale produced by plasma cutting and flame cutting.
6. The scratches caused by human factors are more serious: in the process of hoisting, transportation and structural processing, the scratches caused by human factors such as bumping, dragging and hammering are more serious, which makes the surface treatment more difficult, and it also produces rust after treatment. The main reason.
7. Equipment factors: Scratches and creases caused during the bending and bending of profiles and plates are also the main reasons for corrosion after treatment. Common sense of stainless steel surface treatment
8. Other factors: In the process of purchasing and storing stainless steel raw materials, bumps and scratches caused by hoisting and transportation are also more serious, which is also one of the reasons for corrosion.