某核电站凝汽器在海水中阴极保护参数的研究及应用

doi:10.11902/1005.4537.2016.122

中国腐蚀与防护学报

2016, Vol. 36

Issue (6): 624-630 DOI: 10.11902/1005.4537.2016.122

研究报告

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某核电站凝汽器在海水中阴极保护参数的研究及应用

王廷勇¹(

),马兰英²,汪相辰¹,张海兵³,陈凯¹,闫永贵³

1. 青岛双瑞海洋环境工程股份有限公司青岛 266101
2. 中油管道物资装备有限公司廊坊 065000
3. 中船重工第七二五研究所海洋腐蚀与防护重点实验室青岛 266101

Investigation of Cathodic Protection Parameters of Candi-date Materials of Condenser for a Nuclear Power Station and Its Application in Seawater

Tingyong WANG¹(

),Lanying MA²,Xiangchen WANG¹,Haibing ZHANG³,Kai CHEN¹,Yonggui YAN³

1. Sunrui Marine Environment Engineering Co., Ltd, Qingdao 266101, China
2. China Petroleum Pipeline Material & Equipment Company Limited, Langfang 065000, China;
3. State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, CSIC, Qingdao 266101, China

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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 (vs Ag/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。

关键词 ：凝汽器, 腐蚀, 阴极保护, 氢脆, 电位

Abstract：

The electrochemical performance of domestic Ti-alloy TA2, an imported Ti-alloy condenser tube and 316L stainless steel were studied comparatively in seawater by means of electrochemical measurements and slow strain rate method with emphasis on the effect of different polarization 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 accelerated the corrosion of 316L stainless steel. When cathodic protection is applied to the above couple, 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.

Key words： condenser corrosion cathodic protection hydrogen embrittlement potential

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	王廷勇
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引用本文:

王廷勇,马兰英,汪相辰,张海兵,陈凯,闫永贵. 某核电站凝汽器在海水中阴极保护参数的研究及应用[J]. 中国腐蚀与防护学报, 2016, 36(6): 624-630.
Tingyong WANG, Lanying MA, Xiangchen WANG, Haibing ZHANG, Kai CHEN, Yonggui YAN. Investigation of Cathodic Protection Parameters of Candi-date Materials of Condenser for a Nuclear Power Station and Its Application in Seawater. Journal of Chinese Society for Corrosion and protection, 2016, 36(6): 624-630.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2016.122 或 https://www.jcscp.org/CN/Y2016/V36/I6/624

图1 拉伸实验用钛管试样

图2 钛管, 国产纯钛 TA2和316L不锈钢试样在海水中的极化曲线

表1 3种实验材料的腐蚀电化学参数

图3 不同极化条件下钛管试样的应力-应变曲线

表2 钛管试样的力学性能

图4 钛管试样在不同极化条件下的氢脆系数

图5 钛管试样在不同极化电位下的断口显微形貌

图6 不同温度下钛合金的阴极电流随时间变化曲线

图7 凝汽器水室内壁表面腐蚀形貌

表3 海水中凝汽器水室的保护电位

图8 采用铁锰合金阳极保护的凝汽器水室

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