No.

Plating solution

Work piece (45 # steel)

Thickness

Salt spray

1

trivalent chromium bath

Polish rods

10 μm

0.5 h

2

hexavalent chromium bath

(micro cracks agent)

24 h

3

trivalent chromium bath

Roughen bars

40 - 50 μm

1 h

4

hexavalent chromium bath

(micro cracks agent)

72 h

5

hexavalent chromium bath

(without micro cracks agent)

Polish rods

10 μm

2 h

6

Roughen bars

45 μm

30 h