高强不锈钢在海水环境中的阴极保护行为研究  

Cathodic Protection Behaviors of High Strength Stainless Steel in Seawater

作　　者：王鑫 白双锋 郭云峰 黄哲华 李相波 侯健 张慧霞 WANG Xin;BAI Shuang-feng;GUO Yun-feng;HUANG Zhe-hua;LI Xiang-bo;HOU Jian;ZHANG Hui-xia(State Key Laboratory for Marine Corrosion and Protection,Luoyang Ship Material Research Institute,Shandong Qingdao 266237,China)

机构地区：[1]中国船舶集团有限公司第七二五研究所海洋腐蚀与防护重点实验室,山东青岛266237

出　　处：《装备环境工程》2023年第8期45-52,共8页Equipment Environmental Engineering

摘　　要：目的研究不同阴极极化电位下高强不锈钢的极化行为,确定某高强不锈钢合理的阴极保护电位区间。方法通过动电位极化测试以及电化学阻抗测试等电化学测试手段,研究此种高强不锈钢在海水中的阴极反应过程,通过不同极化电位下的恒电位极化测试,结合扫描电子显微镜和能谱仪,观察分析试样表面的腐蚀产物,研究阴极极化电位对高强不锈钢表面阴极产物膜的影响规律,以及对高强不锈钢在海水中的阴极保护效果。结果动电位极化测试表明,在-0.50~-0.90 V,只需要施加很小的阴极电流,就可使极化电位发生显著变化。电化学阻抗谱测试及拟合结果表明,极化电位在-0.70 V时,电极反应的电荷转移电阻最大,此时腐蚀被完全抑制。恒电位极化测试发现,随着电位负移,极化电流密度整体上呈现先减小、后增大的趋势。用能谱仪分析其表面产物发现,钙镁沉积层的致密度呈现先增加、后降低的趋势。结论此种高强不锈钢在海水环境中施加阴极电位为-0.50~-1.00 V时,可以得到有效保护。The work aims to study the polarization behavior of high strength stainless steel at different cathodic polarization potentials,so as to determine the reasonable cathodic protection potential range of high strength stainless steel.The cathodic reaction process of the high strength stainless steel was studied by electrochemical test methods such as potentiodynamic polarization test and electrochemical impedance test.The corrosion products on the surface of the samples were observed and analyzed by cathodic polarization combined with scanning electron microscope and energy dispersive spectrometer.The effect of cathodic polarization potential on the cathodic product film on the surface of the high strength stainless steel and the cathodic protection effect of the high strength stainless steel in seawater were studied.Potentiodynamic polarization test indicated that when the cathode polarization potential was-0.50 V~-0.9 V,only a small cathode current could make the polarization potential change significantly.Electrochemical impedance spectroscopy test and fitting results show that when the polarization potential was-0.7 V,the charge transfer resistance of electrode reaction was the maximum,and the corrosion was completely suppressed.Potentiostatic polarization test found that with the negative shift of potential,the polarization current density decreased firstly and then increased.EDS analysis of the surface products showed that the density of calcium and magnesium deposited layer increased firstly and then decreased.This kind of high strength stainless steel can be effectively protected when the cathode potential is-0.50~-1.00 V under seawater environment.

关 键 词：海洋工程 高强不锈钢 阴极保护 阴极极化 电化学行为 XRD 

分 类 号：TG174.41[金属学及工艺—金属表面处理]