310S和AL-6XN不锈钢在熔融MgCl2中的腐蚀行为
Corrision Behavior of 310S and AL-6XN Steels in Molten MgCl2
摘 要
研究了310S和AL-6XN两种不锈钢在800 ℃下MgCl2熔盐中的腐蚀行为, 采用X射线衍射仪(XRD)和金相显微镜对腐蚀产物和截面形貌进行了分析。结果表明, 两者都为均匀腐蚀, 310S初始腐蚀速率比AL-6XN大很多, 之后两者均慢慢减小并趋近于零。由腐蚀深度得到前者腐蚀等级为9级, 后者为8级, 都属于欠耐蚀。在800 ℃下, 两种材料腐蚀过程符合三维扩散(Ginstring-Brounshtein)反应动力学模型, 反应常数分别是0.0048和0.0081, 并得到他们的动力学方程。在MgCl2熔盐中AL-6XN比310S的耐腐蚀性能更好。
热腐蚀
奥氏体不锈钢
molten salt
hot corrosion
austenitic stainless steel
Abstract
The corrosion behaviors of 310S and AL-6XN steels in MgCl2 molten salts were studied. The corrosion products and cross-section were amalyzed by means of X-ray diffraction (XRD) and metallurgical microscopy. Both steels showed uniform corrosion. 310S had a higher initial corrosion rate than AL-6XN. The corrosion rate of both steels was slowed down and trended to zero afterward. According to the corrosion depth, corrosion grades of 310S and AL-6XN were classified as 9 and 8 respectively, indicating insufficient corrosion resistance. These two corrosion processes belonged to 3D diffusion (Ginstring-Brounshtein) kinetic model. The reaction constants were 0.0048 and 0.0081 respectively, and the kinetic equations were obtained. AL-6XN showed better corrosion resistance than 310S in MgCl2 molten salts.
中图分类号 TG172.6+2 TG172.82
所属栏目 试验研究
基金项目 国家863计划重点项目(No.2009AA06Z102)
收稿日期 2010/3/6
修改稿日期 2010/4/26
网络出版日期
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备注俞进进,硕士研究生,
引用该论文: YU Jin-jin,LU Gui-min,SHANG Shu-zhen,YU Jian-guo. Corrision Behavior of 310S and AL-6XN Steels in Molten MgCl2[J]. Corrosion & Protection, 2011, 32(1): 12
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【3】Gonzalez J G,Haro S,Martinez-Villafane A,et al. Corrosion performance of heat resistant alloys in Na2SO4-V2O5 molten salts[J]. Materials Science & Engineering,2006(435/436):258-265.
【4】Zhu B,Lindbergh G. Corrosion behaviour of high-chromium ferritic steels in molten carbonate in cathode environment[J]. Electrochimica Acta,2001, 46(17):2593-2604.
【5】曾潮流, 吴维弢. Ni-Ti合金在熔融(Li,K)2CO3中的腐蚀行为研究[J]. 金属学报, 2000,36(5):517-520.
【6】Cho S H,Hur J M,Seo C S,et al. Hot corrosion behavior of Ni-base alloys in a molten salt under an oxidizing atmosphere[J]. Journal of Alloys and Compounds,2009,468(1/2):263-269.
【7】Cho S H,Hur J M,Seo C S,et al. High temperature corrosion of superalloys in a molten salt under an oxidizing atmosphere[J]. Journal of Alloys and Compounds,2008,452(1):11-15.
【8】Frangini S,Loreti S. The role of temperature on the corrosion and passivation of type 310S steel in eutectic(Li+K) carbonate melt[J]. Journal of power sources,2006,160(2):800-804.
【9】马海涛, 王来. 310SS在KCl盐膜下高温空气中腐蚀机理[J]. 大连理工大学学报,2002,42(6):687-691.
【10】孟丽君,邢辉,庞淦文, 等. AL6XN超级奥氏体钢的高温蠕变及疲劳行为研究[J]. 原子能科学技术,2009,43(6):509-513.
【11】Huang Y L,Oguocha I N A,Yannacopoulos S. The corrosion wear behaviour of selected stainless steels in potash brine[J]. Wear,2005,258(9):1357-1363.
【12】Fritz J D,Gerlock R J. Chloride stress corrosion cracking resistance of 6% Mo stainless steel alloy (UNS N08367)[J]. Desalination,2001,135(1/3):93-97.
【13】Wu Y L,Huang X F,Yang M D,et al. Study on the mechanisms and kinetics of complex’s thermal decomposition getting anhydrous magnesium chloride[J]. Journal of Analytical and Applied Pyrolysis,2008,81(1):133-135.
【14】Kipouros G J,Sadoway D R. A thermochemical analysis of the production of anhydrous MgCl2[J]. Journal of Light Metals,2001,1(2):111-117.
【15】Fernandez J F,Cuevas F,Sanchez C. Surface activation and hydrogenation kinetics of Ti sponge[J]. International Journal of Hydrogen Energy,1996,21(9):765-768.
【16】梁成浩. 金属腐蚀学导论[M]. 北京:机械工业出版社, 1999.
【17】胡荣祖,史启祯. 热分析动力学[M]. 北京: 科学出版社,2001.
【18】陈艺锋,彭长宏,唐谟堂. 锌蒸气的氧化行为与氧化锌的结晶形貌[J]. 高等学校化学学报,2005,26(2):213-217.
【19】李远士,牛焱, 吴维弢. 金属材料的高温氯化腐蚀[J]. 腐蚀科学与防护技术,2000,12(1):41-44.
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