Corrosion resistance to polishing
The raw material is required to have good polishing performance. The main factors affecting the polishing performance are as follows:
(1) surface defects of raw materials. Such as scratch, hemp, acid, and so on.
(2) material problem. Hardness is too low, polishing is not easy to shine (BQ bad), and the hardness is too low, in the deep stretch surface easy to appear orange peel phenomenon, thus affecting BQ. High hardness of BQ is relatively good.
(3) after deep drawing, small black spots and RIDGING will appear on the surface of the area with a large amount of deformation, thus affecting the BQ property.