What are the common rust removal methods of button head stainless steel screws?

Some people will say stainless steel screws will not rust, why also need to remove rust? In fact, stainless steel screws are not rust, when the improper operation in the production, cleaning or use of the environment will lead to its surface red rust, is often said to rust, so what are the common methods of derusting this button head stainless steel screws?

One is chemical derusting, also known as pickling. button head stainless steel screws are generally groove type, when the groove is relatively small, in the pickling process if the operation is not careful, then there will be pickling solution residue in the slot, and the slot this place does not look so clean.

The second is mechanical derusting. Mechanical derusting methods generally include sandblasting, grinding, sandpaper grinding and so on. The advantage is that there is no intergranular corrosion, pitting, hydrogen embrittlement, crack or dirt deposition. But this method of derusting is more costly for chemical derusting. Because chemical derusting can be done in one container at a time. But if the mechanical rust need to put the button head stainless steel screws one by one processing, the cost of artificial, man-hour will be more. So generally, pickling is used to remove rust.