带锈碳钢在流动海水中的长期腐蚀行为
收稿日期: 2012-05-08
修回日期: 2012-06-04
网络出版日期: 2012-10-11
基金资助
国家自然科学基金资助项目50971118
CORROSION BEHAVIOR OF LONG–TIME IMMERSED RUSTED CARBON STEEL IN FLOWING SEAWATER
Received date: 2012-05-08
Revised date: 2012-06-04
Online published: 2012-10-11
Supported by
Supported by National Natural Science Foundation of China (No.50971118)
将Q235碳钢在流动海水中浸泡280 d, 利用失重法和多种腐蚀电化学方法研究了其在浸泡过程中的腐蚀规律. 结果表明, 与静止海水浸泡相比, 在流动体系长时间浸泡后, 电极表面几乎不存在疏松的黄色锈层, 而被一层致密的黑色腐蚀产物所覆盖;失重法测得的腐蚀速率随腐蚀时间延长呈现减小的趋势, 并最终趋于稳定,与静止海水相比, 流动海水中的腐蚀速率高出约1倍; 电化学方法测得的腐蚀速率则随浸泡时间的延长而增大, 与失重法的结果之间存在较为明显的偏差,并且浸泡时间越长, 这一偏差越明显. 长期浸泡后, 碳钢表面的锈层对电化学测试结果产生影响, 是导致电化学方法不能准确评估腐蚀速率的原因.
彭欣 王佳 山川 王海杰 刘在健 邹妍 . 带锈碳钢在流动海水中的长期腐蚀行为[J]. 金属学报, 2012 , 48(10) : 1260 -1266 . DOI: 10.3724/SP.J.1037.2012.00258
The rust/metal structure is one of the multiphase and multiple interface complex systems. The corrosion under rust is the uppermost and longest form of metallic corrosion evolution process. It is difficult to accurately determine the electrochemical parameters because the existence of rust complicates the electrochemical corrosion process. Based on the result of the previous studies of quiescent seawater, the weight–loss method and different electrochemical tests such as polarization curves (PC), electrochemical impedance spectra (EIS) and linear polarization resistance (LPR) were carried out to study the corrosion behavior of A3 carbon steel immersed in flowing seawater for about 280 d. After very short immersing time, there is a thin yellow rust layer on carbon steel, but as time prolonged, the yellow corrosion products are rushed away quickly, and a tense black rust layer cover about the whole electrode. The corrosion rate obtained by weight–loss method show a steady decline and keep stable after about 84 d, but it is higher than that of the static state system data. The cathodic polarization curves show an obvious reduction current peak at about −950 mV, which makes a remarkable overestimating of the cathodic corrosion current. Polarization resistance (Rp), determined by LPR and EIS, increases during the merely short–initial immersion period, then, it decreases gradually with immersion time. This means that the corrosion rate determined by electrochemical tests shows an another pattern compared with the weight–loss result. After a very short immersion time (about 14 d), there is a remarkable deviation between the weight–loss and electrochemical test results, and the longer immersed the greater of this deviation is. So no matter in static state or flowing seawater, electrochemical methods can not get an accurate corrosion rate of carbon steel. And reliable electrochemical measurement and analysis for rusted steel need much more attention.
Key words： carbon steel; flowing seawater; rust layer; corrosion rate; deviation
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