12Cr1MoV钢在高温混合碱金属氯盐中的热腐蚀行为
Hot Corrosion Behavior of 12Cr1MoV Steel in High Temperature Mixed Alkali Chloride Salt
摘 要
采用腐蚀动力学分析法，研究了12Cr1MoV低合金钢在高温（600，700℃）70%NaCl-30%KCl、50%NaCl-50%KCl、30%NaCl-70%KCl（质量分数）混合盐中的热腐蚀行为，观察了表面及截面腐蚀形貌，分析了腐蚀产物成分并研究了其腐蚀机制。结果表明：12Cr1MoV钢在高温混合盐中会发生严重的表面与内部腐蚀，其内部产生的氯气是导致裂纹与孔洞等缺陷萌生和扩展的主要原因；随混合盐中KCl含量的增多和温度的升高，试样的腐蚀速率明显增大；较高含量的KCl使钢内部由沿晶腐蚀转变为整体性侵蚀。
碱金属混合氯盐
热腐蚀
微观结构
12Cr1MoV steel
mixed alkali chloride salt
hot corrosion
microstructure
Abstract
Hot corrosion behavior of 12Cr1MoV low alloy steel in mixed salts of 70%NaCl-30%KCl, 50%NaCl-50%KCl, 30%NaCl-70%KCl (mass fraction) at 600 ℃ and 700 ℃ was studied by the corrosion kinetic method, respectively. The corrosion morphology at the surface and cross section was observed, the composition of the corrosion products was analyzed and the corrosion mechanism was investigated. The results show that the 12Cr1MoV steel was corroded seriously at the surface and in the substrate in the high temperature mixed salts. The produced Cl2 inside the steel was the main reason for the initiation and propagation of defect structure such as cracks and pores. With the increase of KCl content in mixed salts and of the temperature, the corrosion rate of sample increased rapidly. The corrosion mode in the substrate changed from intergranular corrosion to integral corrosion due to the relatively high content of KCl.
中图分类号 TG178 DOI 10.11973/jxgccl201704013
所属栏目 材料性能及应用
基金项目 国家自然科学基金资助项目（51275058）；湖南省高校创新平台开放基金资助项目（13k052）；2015年湖南省研究生创新项目（CX2015B383）
收稿日期 2015/12/22
修改稿日期 2017/2/20
网络出版日期
作者单位点击查看
备注熊维舟(1992-),男,江西南昌人,硕士研究生.
引用该论文: XIONG Wei-zhou,HE Jian-jun,ZHANG Wei,REN Yan-jie. Hot Corrosion Behavior of 12Cr1MoV Steel in High Temperature Mixed Alkali Chloride Salt[J]. Materials for mechancial engineering, 2017, 41(4): 58～63
熊维舟,何建军,张炜,任延杰. 12Cr1MoV钢在高温混合碱金属氯盐中的热腐蚀行为[J]. 机械工程材料, 2017, 41(4): 58～63
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【3】GRUBER T, SCHULZE K, SCHARLER R, et al. Investigation of the corrosion behavior of 13CrMo4-5 for biomass fired boilers with coupled online corrosion and deposit probe measurements [J]. Fuel, 2015, 144: 15-24.
【4】ANTUNES R A, DE-OLIVEIRA M C L. Corrosion in biomass combustion. A materials selection analysis and its interaction with corrosion mechanisms and mitigation strategies[J]. Corrosion Science, 2013, 76: 6-26.
【5】LIU S, LIU Z D, WANG Y T, et al. A comparative study on the high temperature corrosion of TP34H stainless steel, C22 alloy and laser-cladding C22 coating in molten chloride salts [J]. Corrosion Science, 2014, 83: 396-408.
【6】MOHANTY B P, SHORES D A. Role of chlorides in hot corrosion of a cast Fe-Cr-Ni alloy. Part I: Experimental studies [J]. Corrosion Science, 2004, 46(12): 2893-2907.
【7】TSAUR C C, ROCK J C, WANG C J, et al. The hot corrosion of 310 stainless steel with pre-coated NaCl/Na2SO4 mixtures at 750 ℃ [J]. Materials Chemistry and Physics, 2005, 89(2): 445-453.
【8】石照夏, 宋志刚, 郑文杰, 等. 镍铬钼合金在真空熔融CaCl2-20%CaF2盐中的腐蚀行为 [J]. 机械工程材料, 2010, 34(10): 9-13.
【9】YANG X G, LI S L, QI H Y. Effect of high-temperature hot corrosion on the low cycle fatigue behavior of a directionally solidified nickel-base superalloy [J]. International Journal of Fatigue, 2015, 70: 106-113.
【10】METSÄJOKI J, HUTTUNEN-SAARIVIRTA E, LEPISTÖ T. Elevated temperature corrosion of uncoated and aluminized 9-12% Cr boiler steels beneath KCl deposite [J]. Fuel, 2014, 133: 173-181.
【11】SURYANARAYANAN V, IYER K J L, RADHAKRISHNAN V M. Interaction of low temperature hot corrosion and creep [J]. Materials Science & Engineering A, 1989, 112: 107-116.
【12】刘广录, 周晓龙, 陈敬超. Ti3SiC2/SiC在Na3AlF6/Al2O3高温熔盐中的热腐蚀行为[J]. 材料保护, 2007, 40(12): 57-59.
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