Electrochemical method:

(1) Electroplating

(2) Oxidation

Chemical methods:

(a) chemical transformation membrane treatment

(2) electroless plating

Hot working method:

(a) hot dip plating

(2) thermal spraying

(three) hot stamping

(4) chemical heat treatment

(5) surfacing welding

Vacuum method:

(I) Physical Vapor Deposition (PVD)

(2) Ion implantation

(3) Chemical Vapor Deposition (CVD)

Other methods:

(1) coating

(two) impact plating

(three) laser surface treatment

(4) Superdural technology

(5) electrophoresis and electrostatic spraying

1, electrophoresis

2, electrostatic spraying