Weld Seam Defects: The weld seams have significant defects. The Tianjin photovoltaic support manufacturer employs manual mechanical polishing as a remedial measure, which results in polishing marks, causing an uneven surface finish and affecting aesthetics.

2. Inconsistent surface of steel plates: Only pickling and passivation of the welds result in uneven surface, affecting aesthetics.

3. Difficulty in Removing Scratch Marks on Steel Plate Surface: Overall acid pickling and passivation cannot remove various scratches generated during the processing, nor can it eliminate the impurities such as carbon steel, splashes, etc. that adhere to the hot galvanized photovoltaic support surface due to scratches or welding splatter. This leads to rust formation under the conditions of corrosive mediums, where chemical corrosion or electrochemical corrosion occurs.

4. Inconsistent Polishing and Passivation: After manual polishing, acid pickling and passivation treatments are applied. For larger workpieces, achieving a uniform and consistent treatment is challenging, resulting in an ideal surface finish that is not uniform. Additionally, labor costs and auxiliary material costs are relatively high.

5. Limited pickling capability: Pickling passivation paste is not all-encompassing; it's challenging to remove plasma cutting, flame cutting residues, and black oxide scales.

6. Significant scratching caused by human factors: During the hoisting, transportation, and structural processing, scratching due to collisions, dragging, and hammering caused by human factors is quite severe, which increases the difficulty of surface treatment and is also a major cause of rust formation after treatment.

7. Equipment Factors: Scratches and creases caused during the bending and folding processes of profiles and sheets are also primary reasons for rust formation post-processing.

8. Other Factors: During the procurement and storage of the raw materials for hot-dipped galvanized photovoltaic supports, the磕碰 and scratches caused by hoisting and transportation are also quite severe, and they are one of the reasons for the rusting.