三代核电厂海水管道用钢的腐蚀行为  

Corrosion Behavior of Steel for Seawater Pipeline in the Third Generation Nuclear Power Plant

作　　者：袁禹 李伟 周录坤 方奇术 乔彦龙 YUAN Yu;LI Wei;ZHOU Lukun;FANG Qishu;QIAO Yanlong(Shandong Nuclear Power Co.,Ltd.,Haiyang 216600,China;SPIC Power Station Operation Technology(Beijing)Co.,Ltd.,Beijing 112209,China)

机构地区：[1]山东核电有限公司,海阳216600 [2]国家电投集团电站运营技术(北京)有限公司,北京112209

出　　处：《腐蚀与防护》2024年第8期28-32,共5页Corrosion & Protection

摘　　要：通过腐蚀浸泡试验和电化学测试研究了三代核电厂海水管道用钢Q235B在3.5%(质量分数)Na Cl溶液中的腐蚀行为。结果表明:随着温度升高,Q235B钢的开路电位和电化学阻抗降低,腐蚀速率增大,说明其耐蚀性变差;温度的升高不仅促进了钢的溶解,同时还促进了腐蚀产物的形成;在20℃和30℃时,腐蚀产物主要由α-Fe OOH和α-Fe_(2)O_(3)组成,在40℃和600℃时,腐蚀产物由大量α-Fe OOH和少量的α-Fe_(2)O_(3)、γ-Fe OOH组成,α-Fe OOH的相对含量比20℃和30℃时显著增加。The corrosion behavior of Q235B steel for seawater pipeline in the third generation nuclear power plant was studied by immersion corrosion testing and electrochemical testing in 3.5%(mass fraction)NaCl solution.The results show that with the increase of temperature,the open circuit potential and electrochemical impedance of the Q235B steel decreased,and the corrosion rate increased,indicating the corrosion resistance of the steel became worse.The increase of temperature not only promoted the dissolution of the steel,but also promoted the formation of corrosion products.At 20℃and 30℃,the corrosion products were mainly composed ofα-FeOOH andα-Fe_(2)O_(3).At 40℃and 60℃,the corrosion products were composed of a large amount ofα-FeOOH and a small amount ofα-Fe_(2)O_(3) andγ-FeOOH,and the relative content ofα-FeOOH increased significantly compared with that at 20℃and 30℃.

关 键 词：核电厂 海水管道用钢 Q235B 电化学 腐蚀速率 

分 类 号：TG172[金属学及工艺—金属表面处理]