摘要
研究了引进凝汽器钛管、国产凝汽器用工业纯钛TA2和316L不锈钢在海水中的阴极电化学行为。通过慢应变速率拉伸实验和断口显微形貌分析,研究了钛管在不同阴极极化电位下的氢脆敏感性,进而获得凝汽器在海水中合理的阴极保护电位参数。结果表明,316L不锈钢/钛结构的凝汽器在海水中会发生电偶腐蚀,造成不锈钢的腐蚀加速;为了降低产生氢脆的风险,钛管在海水中的电位不宜负于-0.7 V,在对凝汽器实施阴极保护时,电位最好维持在-0.50^-0.65 V之间(vsAg/AgCl电极)。据此对凝汽器进行了阴极保护设计,选用铁锰合金阳极对凝汽器进行保护,不仅能满足不锈钢的保护电位要求,取得了良好的保护效果,而且保障了设备长期运行的安全性和经济性。
The electrochemical performance of domestic Ti-alloy TA2, an imported Ti-alloy con- denser tube and 316L stainless steel were studied comparatively in seawater by means of electro- chemical measurements and slow strain rate method with emphasis on the effect of different polar- ization potentials on hydrogen embrittlement and the evolution characters of microstructure of the alloys, so that the reasonable protection potential range for condenser in seawater was obtained. The results revealed that galvanic corrosion occurred for the couple of 316L/Ti in seawater, which accel- erated the corrosion of 316L stainless steel. When cathodic protection is applied to the above cou- ple, the potential of Ti should be better maintained within a range of-0.50--0.65 V （vs Ag/AgCl）. Based on the above results, the cathodic protection design was conducted for the desired condenser,for which FeMn alloy were proposed as anodes to protect the condenser and worked effectively to ensure the long-term and safe operation.
作者
王廷勇
马兰英
汪相辰
张海兵
陈凯
闫永贵
WANG Tingyong MA Lanying WANG Xiangchen ZHANG Haibing CHEN Kai YAN Yonggui(Sunrui Marine Environment Engineering Co., Ltd, Qingdao 266101, China China Petroleum Pipeline Material ＆ Equipment Company Limited, Langfang 065000, China State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, CSIC, Qingdao 266101, China)
出处
《中国腐蚀与防护学报》
CAS
CSCD
北大核心
2016年第6期624-630,共7页
Journal of Chinese Society For Corrosion and Protection
关键词
凝汽器
腐蚀
阴极保护
氢脆
电位
condenser, corrosion, cathodic protection, hydrogen embrittlement, potential
