Corrosion and Inhibition Effects of Mild Steel in Hydrochloric Acid Solutions Containing Organophosphonic Acid

Table 1

Results of planned interval test (PIT) on mild steel in 10% HCl solution.

S. no.	Period	Without inhibitor		With inhibitor		% inhibition
		Concentration; (milligram × 10^2)	Corrosion rate; (milligram centimeter^−2 hour^−1  × 10^2)	Concentration; (milligram ×  10^2)	Corrosion rate; (milligram centimeter^−2 hour^−1  × 10^2)
1	𝐴1 (3 h)	18.96	21.2	5.21	5.82	72
2	𝐴𝑡 (22 h)	31.05	4.70	6.32	0.96	79
3	𝐴𝑡+1 (22 + 3 h)	34.58	4.64	6.40	0.85	82
4	𝐵 (3 h)	3.33	3.72	0.50	0.50	96
5	𝐴𝐶 (3 h)	3.53	3.94	0.08	0.08	97