No.

1

2

3

4

5

6

Material

Rust sample

New sample

Zinc phosphate treatment

〇

〇

×

×

〇

×

Time to paint [h]

4

48

4

48

4

4

Salt spray test period

Before test

◎

◎

◎

◎

◎

◎

After 2 weeks

◎

◎

◎

×

◎

◎

After 1 month

◎

×

×

×

◎

◎

After 2 months

◎

×

×

×

◎

◎