Effect of Temperature on the Corrosion Inhibition of Trans-4-Hydroxy-4^′-Stilbazole on Mild Steel in HCl Solution

Table 1

Effect of concentration of trans-4-hydroxy-4′-stilbazole on the corrosion rate (mg·cm⁻²·h⁻¹) and percentage efficiency of mild steel in 1 M HCl at various temperatures.

	Temperature/k
	303		313		323		333		343
Concentration of inhibitor	Corr. Rate	% Efficiency	Corr. Rate	% Efficiency	Corr. Rate	% Efficiency	Corr. Rate	% Efficiency	Corr. Rate	% Efficiency
1 M HCl	0.961	—	1.394	—	4.671	—	12.225	—	26.280	—
1 M HCl + 1 × 10^−7M	0.950	1	1.381	0.9	4.648	0.5	14.057	−15	28.139	−7.1
1 M HCl + 1 × 10^−6M	0.916	5	1.343	3.7	4.570	2.2	12.733	−4	27.061	−3.0
1 M HCl + 1 × 10^−5M	0.714	26	1.203	14	4.192	10.3	12.714	−4	24.901	5.2
1 M HCl + 1 × 10^−4M	0.191	80	0.361	74	2.179	53.4	8.959	27	24.020	8.6
1 M HCl + 1 × 10^−3M	0.060	94	0.112	92	0.543	88.4	2.321	81	8.619	67