Investigation of Corrosion Protection of Austenitic Stainless Steel in 5.5 M Polluted Phosphoric Acid Using 5-Azidomethyl-7-morpholinomethyl-8-hydroxyquinoline as an Ecofriendly Inhibitor

Table 2

Thickness loss values and corresponding efficiencies deduced from hydrogen evolution tests.

Inhibitor concentration (mmol/L)	Thickness loss (mm/year)	Efficiency (%)
Blank	2.2	—
0.5	0.75	65.7
1	0.58	73.5
2.5	0.31	85.9
5	0.05	97.6