Effects of Electropolishing Processes on Corrosion Behaivor of Alloy 600 in High Temperature and High Pressure Water Environment
摘 要
从电解抛光影响合金表面化学成分与结构的角度出发,利用扫描电镜(SEM)、X射线光电子能谱(XPS)等方法研究了硝酸甲醇(0 ℃,10 s,3 V)和硫酸磷酸水(70 ℃,30 s,0.2 A/cm2)两种不同电解抛光液对600合金在高温高压水环境中腐蚀行为的影响。结果表明:经硝酸甲醇溶液抛光后(EPS1),试样表面的初始产物膜比经硫酸磷酸水(EPS2)溶液抛光后的厚,且EPS1产物膜中氢氧化物的含量比EPS2中的高;高温高压水环境腐蚀试验后两种抛光表面都形成双层结构氧化膜,即富铬内层和分散的富镍、铁氧化物颗粒外层;EPS2产物膜中氢氧化物含量低于EPS1的且铬含量高于EPS1的,EPS2产物膜的致密性和保护性更好,能有效减缓腐蚀进程,形成较薄的氧化膜。分析认为这是由于在两种溶液中电解抛光后样品表面形成了成分与结构不同的初始产物膜。
Abstract
Effects of the changes in surface composition and microstructure caused by two different electropolishing processes on corrosion of alloy 600 in high temperature and high pressure water were investigated. The first electropolishing process was conducted in a HNO3CH3OH electrolyte at 0 ℃ for 10 s at 3 V. The second was conducted in a H2SO4H3PO4H2O electrolyte at 70 ℃ for 30 s at 0.2 A/cm2. Xray photoelectron spectroscopy (XPS) analysis of the primary surfaces after the two electropolishing processes revealed that the surface electropolished by the first process (EPS1) had a thicker primary film than that electropolished by the second process (EPS2). A higher content of hydroxides in EPS1 was also observed. After the corrosion test in high temperature and high pressure water, duplexstructure oxide scale was observed on both surfaces. XPS analysis of the oxide scale showed that the scale formed in EPS2 at the early stage of corrosion had a lower content of hydroxides and a higher content of Cr than that in EPS1. This suggests the scale in EPS2 has a better protectability, which is most likely the cause for the formation of a thinner oxide scale in EPS2 in the subsequent exposures. The difference in the corrosion behavior of EPS1 and EPS2 was attributed to the difference in composition and structure of the primary films formed on alloy 600 by the two electropolishing processes.
中图分类号 TG172.82 DOI 10.11973/fsyfh201607007
所属栏目 核电设备材料防护
基金项目 大型先进压水堆核电站重大专项(2013ZX06005006004)
收稿日期 2015/9/24
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备注梅金娜(1981-),博士,从事核电站金属材料老化研究
引用该论文: MEI Jinna,HAN Yaolei,XUE Fei,PENG Qunjia. Effects of Electropolishing Processes on Corrosion Behaivor of Alloy 600 in High Temperature and High Pressure Water Environment[J]. Corrosion & Protection, 2016, 37(7): 558
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【4】FERGUSON J B,LOPEZ H F. Oxidation products of inconel alloys 600 and 690 in pressurized water reactor environments and their role in intergranular stress corrosion cracking\[J\]. Metall Mater Trans A,2006,37(8):24712479.
【5】HONG S L. Influence of surface condition on primary water stress corrosion cracking initiation of alloy 600\[J\]. Corrosion,2001,57(4):323333.
【6】ZIEMNIAK S E,HANSON M,SANDER P C. Electropolishing effects on corrosion behavior of 304 stainless steel in high temperature,hydrogenated water\[J\]. Corros Sci,2008,50(9):24652477.
【7】ZHANG Z,WANG J Q,HAN E H,et al. Influence of dissolved oxygen on oxide films of alloy 690TT with different surface status in simulated primary water\[J\]. Corros Sci,2011,53(11):36233635.
【8】HAN Y,MEI J,PENG Q J,et al. Effect of electropolishing on corrosion of alloy 600 in high temperature water\[J\]. Corros Sci,2015,98:7280.
【9】CISS S,LAFFONT L,TANGUY B,et al. Effect of surface preparation on the corrosion of austenitic stainless steel 304L in high temperature steam and simulated PWR primary water\[J\]. Corros Sci,2012,56(1):209216.
【10】ANDRESEN P L,HICKLING J,AHLUWALIA A,et al. Effects of hydrogen on stress corrosion crack growth rate of nickel alloys in hightemperature water\[J\]. Corrosion,2008,64(9):707720.
【11】ZIEMNIAK S E,HANSON M. Corrosion behavior of 304 stainless steel in high temperature,hydrogenated water\[J\]. Corros Sci,2002,44(10):22092230.
【12】MAURICE V,YANG W,MARCUS P. Xray photoelectron spectroscopy and scanning tunneling microscopy study of passive films formed on (100) Fe18Cr13Ni singlecrystal surfaces\[J\]. J Electrochem Soc,1998,145(3):909920.
【13】HRYNIEWICZ T,ROKOSZ K. Analysis of XPS results of AISI 316L SS electropolished and magnetoelectropolished at varying conditions\[J\]. Surf Coat Tech,2010,204(16/17):25832592.
【14】WATTS J F,WOLSTENHOLME J. An introduction to surface analysis by XPS and AES\[M\]. Chichester:Wiley & Sons,2003.
【15】MACHET A,GALTAYRIES A,ZANNA S,et al. XPS and STM study of the growth and structure of passive films in high temperature water on a nickelbase alloy\[J\]. Electrochim Acta,2004,49(22/23):39573964.
【16】KONG D S,CHEN S H,WANG C,et al. A study of the passive films on chromium by capacitance measurement\[J\]. Corros Sci,2003,45(4):747758.
【17】ABBOTT A P,CAPPER G,MCKENZIE K J,et al. Voltammetric and impedance studies of the electropolishing of type 316 stainless steel in a choline chloride based ionic liquid\[J\]. Electrochim Acta,2006,51(21):44204425.
【18】DATTA M,VEGA L F,ROMANKIW L T,et al. Mass transport effects during electropolishing of iron in phosphoricsulfuric acid\[J\]. Electrochim Acta,1992,37(13):24692475.
【19】WANG J Q,LI X,HUANG F,et al. Comparison of corrosion resistance of UNS N06690TT and UNS N08800SN in simulated primary water with various concentrations of dissolved oxygen\[J\]. Corrosion,2014,70(6):598614.
【20】COMBRADE P,SCOTT P M,FOUCAULT M,et al. Oxidation of Ni base alloys in PWR water:oxide layers and associated damage to the base metal\[C\]//12th International Conference on Environmental Degradation of Materials in Nuclear Power SystemsWater Reactors2005. Warrendale:TMS (The Minerals,Metals & Materials Society),2005:883890.
【21】FUJIMOTO S,KIM W S,SATO M,et al. Characterization of oxide films formed on alloy 600 and alloy 690 in simulated PWR primary water by using hard Xray photoelectron spectroscopy\[J\]. J Solid State Electrochem,2015(3):111.
【22】SOUSTELLE C,FOUCAULT M,WOLSKI K,et al. PWSCC of alloy 600:a parametric study of surface film effects\[C\]//Ninth International Symposium on Environmental Degradation of Materials in Nuclear Power SystemsWater Reactors. Warrendale:TMS(The Minerals,Metals & Materials Society),1999:105113.
【23】PENG Q J,HOU J,SAKAGUCHI K,et al. Effect of dissolved hydrogen on corrosion of Inconel alloy 600 in high temperature hydrogenated water\[J\]. Electrochim Acta,2011,56(24):83758386.
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