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为研究压载水电解处理技术对压载舱腐蚀的规律,采用静态挂片失重、电化学测试以及扫描电镜(SEM)等方法研究低碳钢在电解压载水中的初期腐蚀行为.结果表明:低碳钢在余氯质量浓度为7.5、17和28 mg/L的压载水中的腐蚀速度分别约为其在天然海水中的1.25、1.46和1.7倍,且余氯质量浓度越高,温度对腐蚀加速的影响越大;试样在电解压载水中的腐蚀过程由阴极反应中的传质过程控制;碳钢在余氯质量浓度为7.5和17 mg/L压载水中的腐蚀形貌留有剥蚀、断裂的特征.腐蚀产物能谱分析表明:电解压载水腐蚀产物中的氯元素含量降低,产物层对氯离子的渗入具有较强的阻碍作用.
In order to study the corrosion of ballast tank by ballast water electrolysis technology, the initial corrosion behavior of mild steel in electrolysis ballast water was studied by static coupon weight loss, electrochemical tests and scanning electron microscopy (SEM) The corrosion rates of mild steel in ballast water with residual chlorine concentrations of 7.5, 17 and 28 mg / L were about 1.25, 1.46 and 1.7 times that of natural seawater, respectively. The higher the residual chlorine concentration, The greater the effect of corrosion acceleration, the corrosion process of sample in electrolytic ballast water is controlled by the mass transfer process in cathodic reaction. The corrosion morphology of carbon steel in ballast water with residual chlorine concentration of 7.5 and 17 mg / L remains The results of energy spectrum analysis of corrosion products show that the content of chlorine element in the corrosion products of electrolytic ballast water decreases and the product layer has strong impediment to chloride ion infiltration.