新型单丝电极交流探头在3.5wt.% NaCl中的电化学响应规律研究

本文应用新研发的一种无参比无辅助的单丝电极交流探头技术,研究碳钢和锌金属丝电极在3.5wt.% NaCl中的电化学腐蚀规律和牺牲阳极保护行为. 通过与传统的三电极电化学交流阻抗结果的对比和分析,进一步证明了该新型探头具有简便、快速、准确、稳定的特性,可实现定量评估. 测量显示,在3.5wt.% NaCl中,碳钢的瞬时腐蚀速率及累积腐蚀失重大于锌,它们腐蚀行为的差异与表面膜的性质及变化有关. 在碳钢-锌电偶对中,锌的保护效率可达到95%以上,且随浸泡时间增加先增加后减小.

Electrochemical Response of A Single Wire-Electrode AC Probe in 3.5wt.% NaCl

In this paper, a recently developed single wire-electrode AC probe technology which does not need a reference or counter electrode was employed to investigate the electrochemical corrosion and sacrificial anode protection behaviors of steel and zinc in 3.5wt.% NaCl. With this simple, fast, reliable and stable probe, the instantaneous corrosion rate and accumulated corrosion loss of carbon steel in 3.5wt.% NaCl were measured, and the results revealed that both were greater than those of zinc. Furthermore, the observed different corrosion behaviors between carbon steel and zinc during the immersion could be caused by their different surface films. With the galvanic couple of carbon steel-zinc, the protection efficiency offered by the anode zinc was found to be above 95%, and it increased initially and then decreased with immersion time.