龚鹏,张光旭,杨超,陈建.pH对Q235B钢在船舶尾气脱硫液中电化学腐蚀行为的影响[J].表面技术,2018,47(12):181-186.
GONG Peng,ZHANG Guang-xu,YANG Chao,CHEN Jian.Influence of pH on the Electrochemical Corrosion Behavior of Q235B Steel in Ship Exhaust Desulfurizing Liquid[J].Surface Technology,2018,47(12):181-186
pH对Q235B钢在船舶尾气脱硫液中电化学腐蚀行为的影响
Influence of pH on the Electrochemical Corrosion Behavior of Q235B Steel in Ship Exhaust Desulfurizing Liquid
投稿时间:2018-03-02  修订日期:2018-12-20
DOI:10.16490/j.cnki.issn.1001-3660.2018.12.025
中文关键词:  Q235B钢  pH值  脱硫液  极化曲线  交流阻抗谱  腐蚀行为  腐蚀形貌
英文关键词:Q235B steel  pH  desulfurizing liquid  polarization curve  electrochemical impedance spectroscopy  corrosion behavior  corrosion morphology
基金项目:国家重点研发计划(CDGC01-KT16)
作者单位
龚鹏 武汉理工大学 化学化工与生命科学学院,武汉 430070 
张光旭 武汉理工大学 化学化工与生命科学学院,武汉 430070 
杨超 武汉理工大学 化学化工与生命科学学院,武汉 430070 
陈建 武汉理工大学 化学化工与生命科学学院,武汉 430070 
AuthorInstitution
GONG Peng School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, Wuhan 430070, China 
ZHANG Guang-xu School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, Wuhan 430070, China 
YANG Chao School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, Wuhan 430070, China 
CHEN Jian School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, Wuhan 430070, China 
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中文摘要:
      目的 研究pH值对Q235B钢在脱硫液中腐蚀行为的影响,为后续工艺参数控制与防护方案设计奠定基础。方法 开展浸泡实验和电化学实验,研究Q235B钢在不同pH值脱硫液中的腐蚀行为,并通过电子扫描显微镜与能谱仪,对不同pH值下腐蚀产物的形貌与元素组成进行分析。结果 失重法测定Q235B钢的腐蚀速率时,腐蚀速率随pH值的升高而减小,且变化幅度越来越小。电化学测试中,Q235B钢在脱硫液中的开路电位随pH值的升高而正移,极化曲线测试没有出现钝化区,自腐蚀电位也随pH值的升高不断正移,而腐蚀电流密度反之。Nyquist图为非标准的半圆形容抗弧,随pH值的升高而不断扩大。通过扫描电镜观察,pH为4.0时,腐蚀产物较少且零星分布在碳钢表面,结构形似花蕾且空隙较多;随着pH值的升高,腐蚀产物显著增多,结构发生改变;当pH为10.0时,碳钢表面覆盖一层红褐色的产物,结构呈球状且紧密堆积。能谱分析显示:腐蚀产物主要由Fe和O元素构成,随着pH值升高,两者含量在产物中的占比不断增加;另外,还含有少量的Na、S和Zn元素。结论 在所研究的pH值范围内,Q235B钢在脱硫液中的腐蚀速率随pH值的升高而降低,腐蚀受到不同程度的抑制。pH值的升高能促进生成有效且致密的腐蚀产物层。在pH值较低时,Q235B钢的腐蚀主要受阳极活化控制;随着pH值的升高,溶液中OH-浓度增大,腐蚀主要受阴极氧去极化控制,耐腐蚀性能增强,腐蚀速率减小。
英文摘要:
      The work aims to study the effect of pH value on corrosion behavior of Q235B steel in desulfurizing liquid, in order to lay the foundation for optimizing the subsequent process parameters and designing the protection coating. Immersion test and electrochemical measurement were conducted to study the corrosion behavior of Q235B steel in desulfurizing liquid with different pH values.The morphologies and element composition of corrosion products in different pH values were analyzed by SEM and EDS. When the corrosion rate of Q235B steel was measured by weight loss method, the corrosion rate decreased with the increase of pH value and change range became smaller. In the electrochemical test, the open circuit potential of Q235B steel in desulfurization solution positively shifted with the increase of pH value. There was no passivation area in the polarization curve. Self-corrosion potential positively shifted with the increase of pH value, whereas corrosion current density was on the contrary. The Nyquist graph was a nonstandard semicircular captance arc which increased with the increase of pH value. Through observation by scanning electron microscope, when pH was 4.0, corrosion products were scattered on the surface of steel and the structural shape looked like bud with void. With the increase of pH value, the corrosion products obviously increased and the structure also changed. When pH was 10.0, the steel surface was covered by a layer of rufous products, whose structure was spherical and compacted. The EDS analysis showed that corrosion products were mainly composed of Fe and O. With the increase of pH value, the proportion increased. What’s more, there was a small amount of Na, S and Zn elements. In the range of studied pH values, corrosion rate of Q235B steel in desulfurizing liquid decreases with the increase of pH value, and the corrosion is inhibited to different degrees. The increase of pH value can promote the formation of effective and compact corrosion products layers. When the pH value is lower, the corrosion of Q235B steel is mainly controlled by anode activation. With the increase of pH value, concentration of OH- increases, corrosion is controlled by cathodic oxygen depolarization, corrosion resistance is enhanced and corrosion rate declines.
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