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胞外聚合物对船用钢初期腐蚀行为的影响

发表时间:2016-06-30  浏览量:2005  下载量:959
全部作者: 董晨华,董耀华,尹衍升
作者单位: 上海海事大学海洋科学与工程学院
摘 要: 采用阳离子树脂交换法提取假单胞菌的代谢产物——胞外聚合物(extracellular polymeric substances,EPS)。利用化学法及傅里叶红外光谱(Fourier transform infrared spectroscopy,FTIR)、X射线光电子能谱(X-ray photoelectron spectroscopy,XPS)等技术分析得出,EPS中含有羰基、羟基、羧基等还原性官能团。应用电化学阻抗谱(electrochemical impedance spectroscopy,EIS)和扫描电子显微镜(scanning electron microscope,SEM)研究EPS对DH32船用钢腐蚀行为的影响,实验结果表明,EPS的存在可以抑制DH32钢在海水中初期腐蚀行为,实验初期随着EPS浓度的增加,抑制腐蚀的效果明显增强;但随着时间的增加,EPS络合金属离子加快了电子的传递,促进了氧化还原反应的进行,使得抑制腐蚀效率有所下降。
关 键 词: 材料科学基础学科;海水腐蚀;电化学;胞外聚合物;船用钢
Title: Influences of extracellular polymers substances on the early marine steel corrosion
Author: DONG Chenhua, DONG Yaohua, YIN Yansheng
Organization: School of Marine Science and Engineering, Shanghai Maritime University
Abstract: The extracellular polymeric substances (EPS) of Pseudomonas were extracted by cation exchange resin method in this paper. The content of EPS was determinated by using chemical method and Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS). The results showed that EPS consist of reduction of functional groups such as carbonyl, hydroxyl, carboxyl group. Electrochemical impedance spectroscopy (EIS) and scanning electron microscope (SEM) were applied in studying the effect of EPS on the corrosion behavior of DH32 steel. The results showed that the presence of EPS can affect the corrosion behavior of DH32 steel in seawater. The corrosion of DH32 steel was inhibited by EPS, and with the increase of EPS concentration, corrosion inhibiting is significantly enhanced. However, due to EPS bound metal ions, the electron transfer was accelerated and redox reaction was promoted, and the efficiency of corrosion inhibition decreased.
Key words: basic subject of material science; seawater corrosion; electrochemistry; extracellular polymeric substances; marine steel
发表期数: 2016年6月第12期
引用格式: 董晨华,董耀华,尹衍升. 胞外聚合物对船用钢初期腐蚀行为的影响[J]. 中国科技论文在线精品论文,2016,9(12):1218-1225.
 
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