| HUANG Kai-hong,ZHOU Kun,RUI Yu-lan,CAO Yi.The Corrosion Inhibition of Tryptophan and Its Compound for Carbon Steel in H2SO4 Solution[J],(5):25-29 |
| The Corrosion Inhibition of Tryptophan and Its Compound for Carbon Steel in H2SO4 Solution |
| Received:June 18, 2012 Revised:October 20, 2012 |
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| DOI： |
| KeyWord:tryptophan synergistic effect corrosion inhibitor isothermal adsorption model |
| Author | Institution |
| HUANG Kai-hong |
College of Chemical Engineering, Hebei United University, Tangshan , China |
| ZHOU Kun |
Department of Chemistry, Hebei Chemical & Pharmaceutical College, Shijiazhuang , China |
| RUI Yu-lan |
College of Chemical Engineering, Hebei United University, Tangshan , China |
| CAO Yi |
College of Chemical Engineering, Hebei United University, Tangshan , China |
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| Abstract: |
| Th etryptophan and its compound were tested as corrosion inhibitors for carbon steel Q235 in an aqueous solution of 0.5 mol/L sulphuric acid by weight-loss and electrochemistry methods. The inhibitory mechanism was discussed by isothermal adsorption model and corrosion kinetics. The results show that single tryptophan has low corrosion inhibitor effect, while L-tryptophan and potassium iodide have certain synergistic effect, but synergistic effect with ascorbic acid is not significant. The three optimum amount of compound, the inhibition efficiency reaches 92.43%; The L-tryptophan and ascorbic acid are mixed type inhibitors, whereas the potassium iodide and complex inhibitors are the anodic type; Tryptophan is absvrbed on the surface of carbon steel by chemisorption adsorbed, in line with the Langmuir adsorption isotherm. |
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