What are the processes of hardware surface treatment?

1: zinc plating, nickel plating, chromium plating, gold plating, silver plating, blackening, oxidation, electrolytic polishing, pickling, phosphating and electrophoresis.

2. Paint, paint, plastic and porcelain.

3. Polishing, wire drawing polishing, grinding, shot blasting, shot blasting and vibration grinding. ?

4. Plastic molding.