摘要:
利用电化学阻抗测试技术等, 研究了X70钢在滨海盐渍土与海水构成的宏电池中的腐蚀行为。结果表明, 构成宏电池之后, 海水侧X70钢一直作为宏电池的阳极处于被腐蚀状态, 其腐蚀速率为自然腐蚀速率的25.3倍, 腐蚀过程主要受阴极反应控制; 由于腐蚀产物膜和氯离子的双重作用使宏电池腐蚀速率先有一定程度的降低, 然后迅速升高, 再有所降低并趋于稳定。试验还发现土壤-海水构成的宏电池的电动势并没有表现出像常规土壤宏电池电动势那样的先升高后降低的趋势, 而是先有一定程度的降低, 然后迅速升高后趋于稳定, 该过程主要受极化电阻的影响。
Abstract:
The macro-cell corrosion of X70 steel between salinized soil and seawater was studied by electrochemical impedance spectroscopy(EIS). It was found that the X70 steel in seawater was corroded as the anode, the corrosion rate was 25.3 times of the natural corrosion rate and the corrosion process was controlled by cathodic reaction. As a result of the effects of both corrosion product membrane and chlorine ion, the macro-cell corrosion rate reduced firstly, then increased quickly, and reduced slightly to a steady state at last. The results also showed that the electromotive force (EMF) of the macro-cell performed differently from the conventional macro-cell corrosion in soils. Because of the effect of polarization resistance, EMF first reduced slightly, then increased quickly and stabilized.
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