Pitting Behavior of 304L/ER316L Austenitic Stainless Steel Welded Plate
摘 要
采用三氯化铁浸泡试验和电化学试验研究了核电站乏燃料池覆面用304L/ER316L/304L奥氏体不锈钢焊接板在3.5%(质量分数) NaCl溶液(溶液1),含2 700 mg/L B3+的纯硼酸溶液(溶液2)和含2 700 mg/L B3++200 mg/L Cl-的混合溶液(溶液3)中的点蚀行为,同时研究了温度和氯离子对其点蚀行为的影响。结果表明:在三种溶液环境中,焊接板不同区域的耐点蚀性能由强到弱依次为焊缝区 > 母材区 > 热影响区。焊缝金属耐点蚀性能最优的主要原因是Ni、Mo含量较高,而热影响区的最差是由于显微组织不良。在30,40,60℃溶液2中,即使在高电位下也未观测到焊接板发生明显点蚀,而掺杂200 mg/L Cl-后,焊接板的点蚀倾向显著增加,点蚀敏感性随温度升高而升高。符合设计参数的纯硼酸溶液是很好的服役环境,但当其中加入Cl-后,焊接板的耐点蚀性能会大幅降低,故乏燃料池在服役期间,应严格控制水温变化并监控水质,避免温度长时间过高及侵蚀性Cl-含量超标。
Abstract
Pitting behavior of the 304L/ER316L/304L austenitic stainless steel welded plate for the spent fuel pool cover of nuclear power plant was studied in the solution containing 3.5% (mass fraction) NaCl (No. 1 solution), containing 2 700 mg/L B3+ (No. 2 solution) and containing 2 700 mg/L B3+ + 200 mg/L Cl- (No. 3 solution) by ferric chloride immersion test and electrochemical test. The results show that in the three solution environments, the pitting resistance of different areas of the welded plate was weld metal > base metal > heat affected zone. The main reason for the best pitting resistance of weld metal was that the Ni and Mo content were high, and the poor pitting resistance of the heat affected zone was caused by poor microstructure. In No. 2 solution at 30, 40, 60℃, no obvious pitting of the welded plate was observed even at high potential. After doping 200 mg/L Cl- in solution No. 2, the pitting tendency of the welded plate increased remarkably, and the pitting sensitivity increased with the increase of temperature. A pure boric acid solution meeting the design parameters was a good service environment, but when Cl- was added, the pitting resistance of the welded plate was greatly reduced. Therefore, during the service period of the spent fuel pool, the water temperature change should be strictly controlled and the water quality should be monitored to avoid excessive temperature and excessive erosive Cl- content.
中图分类号 TG174 DOI 10.11973/fsyfh-202001001
所属栏目 试验研究
基金项目 国家科技重大专项(2015ZX06002005)
收稿日期 2019/3/15
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网络出版日期
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引用该论文: ZHAO Di,LI Guangfu,JI Kaiqiang,ZHENG Hui,ZHONG Zhimin. Pitting Behavior of 304L/ER316L Austenitic Stainless Steel Welded Plate[J]. Corrosion & Protection, 2020, 41(1): 1
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【2】陈松, 唐世延, 王启峰, 等. 核电厂反应堆水池钢覆面缺陷分析及处理[C]//中国核学会2015年学术年会. 绵阳:[出版者不详],2015.
【3】张兴田. 核电厂设备典型腐蚀损伤及其防护技术[J]. 腐蚀与防护,2016,37(7):527-533.
【4】张微啸, 李成涛, 陈建军, 等. 304L不锈钢在硼酸水溶液中的腐蚀行为[J]. 腐蚀与防护,2015,36(1):68-71.
【5】郑越, 雷欣, 崔岚, 等. 核电厂水池覆面用不锈钢钢板在硼酸水溶液中的点蚀行为[J]. 腐蚀与防护,2017,38(7):491-521.
【6】姚琳, 郑越, 张洪军, 等. 核电厂水池覆面钢板在硼酸溶液中的腐蚀行为[J]. 腐蚀与防护,2018,39(7):525-529.
【7】徐为民, 詹静, 李成涛, 等. 304L不锈钢焊接接头表面状态对其在硼酸溶液中腐蚀行为的影响[J]. 腐蚀与防护,2018,39(6):459-462.
【8】吕虹玮, 董士刚, 王静静, 等. 316L不锈钢焊缝腐蚀行为的电化学研究[J]. 科技导报,2013,31(Z1):25-28.
【9】王轲, 柳俊良, 韩翠. 奥氏体不锈钢焊缝接头腐蚀性分析[J]. 焊接技术,2014,43(5):16-18.
【10】孟威, 杨瑞成, 牛绍蕊, 等. 奥氏体不锈钢热轧板焊接接头的腐蚀行为[J]. 材料保护,2009,42(10):26-28.
【11】HAFEZ K M. The effect of welding atmosphere on the pitting corrosion of AISI 304L resistance spot welds[J]. The International Journal of Advanced Manufacturing Technology,2018,97(1):243-251.
【12】SING H J,SHAHI A S. Weld joint design and thermal aging influence on the metallurgical, sensitization and pitting corrosion behavior of AISI 304L stainless steel welds[J]. Journal of Manufacturing Processes,2018,33:126-135.
【13】国家质量技术监督局. GB/T 17897-1999不锈钢三氯化铁点腐蚀试验方法[S]. 北京: 中国标准出版社, 1999.
【14】国家质量技术监督局. GB/T 17899-1999不锈钢点蚀电位测量方法[S]. 北京: 中国标准出版社, 1999.
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【18】FREIRE L, CARMEZIM M J, FERREIRA M G S, et al. The passive behaviour of AISI 316 in alkaline media and the effect of pH: A combined electrochemical and analytical study[J]. Electrochimica Acta,2010,55(21):6174-6181.
【19】FREIRE L, CARMEZIM M J, FERRRIRA M G S, et al. The electrochemical behaviour of stainless steel AISI 304 in alkaline solutions with different pH in the presence of chlorides[J]. Electrochimica Acta, 2011,56(14):5280-5289.
【20】LUO H, DONG C F, XIAO K, et al. Characterization of passive film on 2205 duplex stainless steel in sodium thiosulphate solution[J]. Applied Surface Science, 2011,258(1):631-639.
【21】LUO H, DONG C F, LI X G, et al. The electrochemical behaviour of 2205 duplex stainless steel in alkaline solutions with different pH in the presence of chloride[J]. Electrochimica Acta, 2012,64(1):211-220.
【22】GUITIÁN B, NÁVOA X R, PUGA B. Electrochemical impedance spectroscopy as a tool for materials selection: water for haemodialysis[J]. Electrochimica Acta, 2011,56(23):7772-7779.
【23】艾莹珺. 304不锈钢在3.5% NaCl溶液中点蚀过程的电化学研究[D]. 南昌:南昌航空大学, 2016.
【24】杨武, 顾濬祥, 黎樵燊, 等. 金属的局部腐蚀[M]. 北京:化学工业出版社,1995:21-29.
【25】WESTIN E M, HERTZMAN S. Element distribution in lean duplex stainless steel welds[J]. Welding in the World, 2014,58(2):143-160.
【26】杨武,POURBAIX A. 铬和钼对钢的局部腐蚀发展过程的影响[J]. 中国腐蚀与防护学报, 1983,3(1):22-34.
【27】杨武, 华惠中. Fe-Cr-Mo系铁素体不锈钢在氯化物介质中的实验电位-pH图研究[J]. 中国腐蚀与防护学报, 1985,5(2):79-91.
【28】华惠中, 赵国珍, 李丽霞, 等. Fe-Cr-Mo系铁素体不锈钢在中性氯离子介质中钝化膜及其破坏的XPS研究[J]. 中国腐蚀与防护学报, 1987,7(4):233-238.
【29】杨武, 袁世彪, 吴民达. Ni对Fe-Cr-Ni-Mo钢抗局部腐蚀性能的影响[J]. 腐蚀与防护, 1992,13(6):286-291.
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