2. Surface inconsistency: Only pickling and passivating the weld seam causes uneven surface and affects its appearance.
3. Scratches are difficult to remove: overall acid pickling and passivation cannot remove various scratches generated during the processing, and cannot remove impurities such as carbon steel and splashes adhered to the surface due to scratches and welding splashes, which can cause chemical or electrochemical corrosion and rust in the presence of corrosive media.
4. Uneven polishing and passivation: After manual polishing and pickling, it is difficult to achieve a uniform and consistent treatment effect on workpieces with large areas, and an ideal uniform surface cannot be obtained. And the labor cost and auxiliary material cost are also relatively high.

  5. Limited acid washing ability: Acid washing passivation paste is not omnipotent, and it is difficult to remove black oxide scales produced by plasma cutting, flame cutting, and other processes.
6. Scratches caused by human factors are more severe: During the lifting, transportation, and structural processing, scratches caused by human factors such as bumps, dragging, and hammering are more severe, making surface treatment more difficult and also the main cause of rust after treatment.
7. Backup factors: Scratches and creases caused during the bending and folding process of profiles and plates are also the main causes of rust after treatment.
8. Other factors: During the procurement and storage process of stainless steel bright rod raw materials, severe collisions and scratches caused by lifting and transportation are also one of the reasons for corrosion.