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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。
The corrosion behavior of X70 steel in macro-batteries consisting of coastal saline soil and seawater was studied by means of electrochemical impedance technique. The results show that the X70 steel in the seawater side has been eroded as the anode of the macro battery after forming the macro battery, and its corrosion rate is 25.3 times that of the natural corrosion rate. The corrosion process is mainly controlled by the cathode reaction. Due to the corrosion product membrane and the chloride ion The dual role of macro-battery corrosion rate first reduced to a certain extent, and then rapidly increased, then reduced and stabilized. The experiment also found that the electromotive force of the macro-cell constituted by soil-seawater did not show the trend of increasing first and then decreasing as that of the conventional macro-cell electromotive force, but decreased to a certain extent and then stabilized rapidly after it rose rapidly. The process is mainly affected by the polarization resistance.