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 4

Impedance data of AISI 321 in 5.5 M polluted phosphoric acid with and without addition of AMH at various concentrations.

Concentration (mmol/L)	(Ω·cm^2)	(Ω·cm^2)	. 10^−6 (Ω^−1·cm^−2·s^n)		(10^−3)	Efficiency (%)
Blank					2.85	—
0.5					0.7	67.91
1					3.04	71
2.5					1.64	87
5					9.48	97.53