Effect of Serine and Methionine on Electrochemical Behavior of the Corrosion of Mild Steel in Aqueous Solutions

Table 5

Concentrations effect of serine and methionine on the pitting current (𝜇A/cm²) and their corrosion inhibition efficiency (I.E.%) on mild steel in 0.1 M Na₂HPO₄ + 0.1 M NaCl solution.

Conc. of amino acids	Properties	Blank	Serine	Methionine
0.02 M	𝐼𝑝 (𝜇A/cm^2); I.E.%	0.228; —	0.063; 72.20	0.057; 74.70
0.01 M	𝐼𝑝 (𝜇A/cm^2); I.E.%	0.228; —	0.074; 67.39	0.059; 74.12
0.005 M	𝐼𝑝 (𝜇A/cm^2); I.E.%	0.228; —	0.119; 47.58	0.066; 71.05
0.0025 M	𝐼𝑝 (𝜇A/cm^2); I.E.%	0.228; —	0.126; 44.73	0.078; 65.49
0.00125 M	𝐼𝑝 (𝜇A/cm^2); I.E.%	0.228; —	0.140; 38.52	0.081; 64.47