Some Thiophene Derivatives as Corrosion Inhibitors for Carbon Steel in Hydrochloric Acid

Table 3

Values of inhibition efficiencies (%IE) and surface coverage (𝜃) of inhibitors for the corrosion of carbon steel in 1 M HCl from weight loss measurements at different concentrations and at 25°C.

𝐶inh.× 10^−5(M)	A		B		C
	%IE	𝜃	%IE	𝜃	%IE	𝜃
2	46.1	0.461	35.6	0.356	23.9	0.239
4	54.3	0.543	47.9	0.479	33.8	0.338
6	58.9	0.589	54.3	0.543	41.7	0.417
8	64.3	0.643	60.8	0.608	50.2	0.502
10	66	0.66	62.5	0.625	56.7	0.567
12	72.5	0.725	66.6	0.666	64.9	0.649