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浸水率对低合金钢海水腐蚀行为的影响
引用本文:王奎,张慧霞,郭为民,傅宇东.浸水率对低合金钢海水腐蚀行为的影响[J].装备环境工程,2014,11(3):14-19.
作者姓名:王奎  张慧霞  郭为民  傅宇东
作者单位:哈尔滨工程大学 材料科学与化学工程学院, 哈尔滨 150001;中国船舶重工集团公司第七二五研究所 海洋腐蚀与防护重点实验室, 青岛 266101;中国船舶重工集团公司第七二五研究所 海洋腐蚀与防护重点实验室, 青岛 266101;中国船舶重工集团公司第七二五研究所 海洋腐蚀与防护重点实验室, 青岛 266101;哈尔滨工程大学 材料科学与化学工程学院, 哈尔滨 150001
摘    要:目的计算不同浸水率试样的平均腐蚀速率,并与全浸条件下的腐蚀行为进行对比研究。方法采用电化学测量技术,测量不同干湿循环后试样在海水中的开路电位、极化电阻和电化学交流阻抗,分析不同浸水率对低合金钢电化学性能的影响。利用三维视频显微镜观察不同浸水率试样的腐蚀形貌,采用X射线分析仪分析锈层组成。结果干湿交替条件下低合金钢的腐蚀速率比全浸条件下增大1个数量级,自腐蚀电位正移150 mV左右,极化电阻增大2个数量级;且随着浸水率增大,腐蚀速率减小,自腐蚀电位无明显变化,试验初期电阻增大,但是试验后期无明显变化。结论观察腐蚀形貌和锈层组成,全浸条件下以FeOOH为主,干湿交替条件下出现较多的Fe3O4。

关 键 词:低合金钢  腐蚀  浸水率  天然海水
收稿时间:2014/3/22 0:00:00
修稿时间:4/9/2014 12:00:00 AM

Research on Corrosion Behavior of Low Alloy Steel Under the Natural Seawater Wet-Dry Alternate Condition
WANG Kui,ZHANG Hui-xi,GUO Wei-min and FU Yu-dong.Research on Corrosion Behavior of Low Alloy Steel Under the Natural Seawater Wet-Dry Alternate Condition[J].Equipment Environmental Engineering,2014,11(3):14-19.
Authors:WANG Kui  ZHANG Hui-xi  GUO Wei-min and FU Yu-dong
Institution:College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China;Science and Technology on Marine Corrosion and Protection Laboratory,Luoyang Ship Materials Research Institute, Qingdao 266071, China;Science and Technology on Marine Corrosion and Protection Laboratory,Luoyang Ship Materials Research Institute, Qingdao 266071, China;Science and Technology on Marine Corrosion and Protection Laboratory,Luoyang Ship Materials Research Institute, Qingdao 266071, China;College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China
Abstract:Objective To calculate the average corrosion rate of samples with different wet-dry ratios, and to compare with the corrosion behavior under full immersion condition. Methods Open circuit potential, polarization resistance and electrochemical impedance of the samples in seawater were measured after various wet-dry cycles using electrochemical measurement method, and the effects of wet-dry ratio on the electrochemical properties of low alloy steel were analyzed. 3-D video microscopy was used to observe the corrosion morphology of samples with different wet-dry ratios, and X-Ray Diffraction was applied to analyze the composition of the rust-layer. Results The results showed that the corrosion rate of low alloy steel was increased by an order of magnitude, the free corrosion potential had a positive shift of 150 mV, and the polarization resistance was increased by two orders of magnitude under the wet-dry alternating condition comparing with that under full immersion in seawater. With the increase of the wet-dry ratio, the corrosion rate declined, and the free corrosion potential had no obvious change. Moreover, the polarization resistance increased at the early test stage, while there was no obvious change at the later stage. Conclusion Observation of corrosion morphology and rust-layer composition showed that the corrosion products under full immersion condition were mainly composed of FeOOH, while the amount of Fe3O4 was higher under dry-wet alternating condition.
Keywords:low alloy steel  corrosion  wet-dry ratio  natural seawater
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