Effect of Amino Acids on the Corrosion of Steel in Sulfuric Acid Solutions
The influence of amino acids on the corrosion behaviour of steel in H2SO4 solutions was studied by potentiodynamic polarization, AC impedance and weight-loss. The Potentiodynamic polarization curve results show that compound amino acids are mixed-type inhibitors which inhibit the reactions of anode and cathode; AC impedance results show that the ternary complex inhibitors have a good synergistic effect and high corrosion rate which can be proved by Resistance (Rt), double-layer capacitance (Cdl), Resistance modulus(︱Z︱), and phase angle from the Nyquist chart, Bode chart and phase angle chart. The weight-loss method show that the corrosion efficiency of composite amino acids are over 90% in 0-16 hours, 30-50°Cand 0.4-2.0mol / L sulfuric acid.
Zhong Cao, Xueqiang Cao, Lixian Sun, Yinghe He
X. H. Liu et al., "Effect of Amino Acids on the Corrosion of Steel in Sulfuric Acid Solutions", Advanced Materials Research, Vols. 239-242, pp. 3142-3145, 2011