Evaluation of Corrosion Behavior of Galvanized Steel Treated with Conventional Conversion Coatings and a Chromate-Free Organic Inhibitor

Table 2

Electrochemical data of the tested materials after immersion in 0.5 M NaCl for 1 h.

Condition	𝛽a  (mV/decade)	𝛽c  (mV/decade)	𝑖corr  (μA/cm^2)	𝐸oc/ 𝐸corr  (mVsce)	Corrosion rate (mpy)	Ch Sq
Untreated	88	367	11.9	−1033/−1050	7.0	3.67𝑒^−6
Inhibitor 5%	44	224	6.9	−1046/−1080	4.0	3.75𝑒^−6
Phosphated	52	201	1.8	−1010/−1020	1.0	4.07𝑒^−6
Chromated	35	278	1.1	−1050/−1040	0.7	4.09𝑒^−6