Surface Characterization of Three-Layer Organic Coating Applied on AISI 4130 Steel

Table 2

Thickness values (m) obtained in SEM (transversal section) and the ball-cratering method and the respective differences (%) between them.

Coating	SEM	Ball-cratering method	Difference (%)
Zn phosphate (single layer)	11 ± 5	11 ± 3	0
MoS2 (topcoat)	4.4 ± 0.8	7 ± 2	37.1
Primer (basecoat)	11 ± 1	19 ± 3	36.8
Zn phosphate	8 ± 3	8 ± 2	0