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首页> 外文期刊>Materials Chemistry and Physics >Influence of temperature on the corrosion behavior of API-X100 pipeline steel in 1-bar CO_2-HCO_3~- solutions: An electrochemical study
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Influence of temperature on the corrosion behavior of API-X100 pipeline steel in 1-bar CO_2-HCO_3~- solutions: An electrochemical study

机译：温度对1-bar CO_2-HCO_3〜-溶液中API-X100管线钢腐蚀行为的影响：电化学研究

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摘要

This paper addresses on the influence of temperature, elucidated with a number of electrochemical methods and immersion tests, on the corrosion behavior of API-X100 steel in CO_2-saturated bicarbonate solutions. Investigated by cyclic potentiodynamic polarization, the corrosion rates, which showed a sensible increase with 10 g L~(-1) (0.16 mol L~(-1)), 30 g L~(-1) (0.5 mol L~(-1)) and 50 g L~(-1) (0.82 mol L~(-1)) bicarbonate concentrations, increased from about 500, to 1500 and 1800 μA cm~(-2) at 20, 50 and 90 ℃, respectively. Passivation at 50 and 90 ℃ showed resistance to deteriorate against 100 ppm chloride ions, of which anodic 0.5 V vs. SCE peaks exclusively appeared. Moreover, transpassivation occurred at 0.9 and 0.7 V vs. SCE, respectively, unlike with the 20 ℃ cases whose chloride-induced-pitting-vulnerable, gradually-forming passive films transpassivated at 1 V vs. SCE. At different potentials, the potentiostatic currents increased with temperature, but their profiles suggested more effective passivation, accordingly. The charge transfer resistance, calculated by electrochemical impedance spectroscopy, decreased with temperature at the open circuit potentials and 0.6 V vs. SCE, where the interfacial interactions were governed by adsorption, and diffusion-limited processes, respectively.
机译：本文探讨了温度的影响，通过多种电化学方法和浸没测试阐明了它们对API-X100钢在CO_2饱和碳酸氢盐溶液中的腐蚀行为的影响。通过循环电位动力极化研究，腐蚀速率显着增加，分别为10 g L〜（-1）（0.16 mol L〜（-1）），30 g L〜（-1）（0.5 mol L〜（- 1））和50 g L〜（-1）（0.82 mol L〜（-1））碳酸氢盐浓度在20、50和90℃时分别从约500、1500和1800μAcm〜（-2）增加。在50和90℃的钝化表现出抵抗100 ppm氯离子的抵抗力下降，其中仅出现了0.5 V vs. SCE的阳极峰。此外，与SCE相比，钝化分别在0.9和0.7 V下发生，与20℃的情况不同，在20 V的情况下，氯化物诱导的点蚀脆弱的，逐渐形成的钝化膜在1 V vs. SCE下被钝化。在不同的电位下，恒电位电流随温度增加，但相应地，它们的分布曲线表明钝化更有效。通过电化学阻抗谱计算得出的电荷转移电阻随开路电势的温度和0.6 V vs. SCE的变化而降低，其中界面相互作用分别受吸附和扩散限制过程控制。

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