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| Anticorrosion Performance of Carbon Steel in 55%LiBr Solution Containing PMA/SbBr3 Inhibitor |
| HU Xian-qi1, LIANG Cheng-hao1,2, HUANG Nai-bao1,2 |
| 1. School of Chemical Engineering, Dalian University of Technology, Dalian 116012, Liaoning, China; 2. Electromechanics and Materials Engineering College, Dalian Maritime University, Dalian 116026, Liaoning, China |
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Abstract The anticorrosion performance of carbon steel in 55%LiBr solution containing PMA/SbBr3 inhibitor was studied by weight-loss tests, electrochemical measurements and surface analysis. In 55%LiBr+PMA/SbBr3 solution, corrosion rates of carbon steel at 145 ��, 175 ��, 190 �� and 240 �� are 18.32 ��m•a-1, 27.68 ��m•a-1, 53.58 ��m•a-1 and 73.78 ��m•a-1, respectively. PMA/SbBr3 inhibitor may inhibit the corrosion of carbon steel in 55%LiBr solution effectively. Especially, it shows an excellent corrosion inhibition performance agent at high temperature. Both anodic and cathodic reactions of carbon steel may be inhibited by PMA/SbBr3 inhibitor, and so it may be classified as mixed inhibitor. In 55%LiBr+PMA/SbBr3 solution, the apparent activation energy of the corrosion reaction of carbon steel is 29.61 kJ•mol-1. The corrosion inhibition mechanism of PMA/SbBr3 is suggested as follows: PMA has the effect of inhibiting hydrogen producing and a strong oxidizing property; Sb3+ also exhibits oxidizing properties, and can exist stably with PMA in LiBr solutions; the passive film comprising Fe2O3 and antimony formed on carbon steel surface may prevent bromine- from diffusing into the metal surface due to the synergistic effect of PMA and Sb3+; As a result, the anticorrosion performance of carbon steel may be improved by PMA/SbBr3 inhibitor in 55% LiBr solution.
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Received: 01 January 1900
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2006, Vol. 1 