Anticorrosive Performance of Zinc Phosphate Coatings on Mild Steel Developed Using Galvanic Coupling

Table 1

Chemical composition, control parameters, and operating conditions of the bath used for zinc phosphating by galvanic coupling.

Chemical composition
ZnO	5 g/L
H3PO4	11.3 mL/L
NaNO2	2 g/L
Control parameters
pH	2.70
Free acid value (FA)	3 pointage
Total acid value (TA)	25 pointage
FA : TA	1 : 8.33
Operating condition
Temperature	27°C
Time	30 minutes