12Cr1MoV钢在碱金属硫氯盐中的腐蚀行为
Corrosion Behavior of 12Cr1MoV Steel in Alkali Metal Sulfur-chloride Salt
摘 要
将12Cr1MoV钢在不同温度（500，550，600℃）、不同组成的KCl-K2SO4熔盐中进行腐蚀试验，研究了温度和熔盐组成对试验钢腐蚀动力学、腐蚀形貌和腐蚀产物的影响。结果表明：随温度的升高或熔盐中K2SO4含量的增加，试验钢的腐蚀加剧；在600℃ KCl-25% K2SO4（质量分数，下同）熔盐中腐蚀后，试验钢表面存在大量的孔洞，腐蚀产物呈颗粒状，而在600℃ KCl-75% K2SO4熔盐中腐蚀后，表面孔洞较少，腐蚀产物呈片状；在600℃ KCl-25% K2SO4熔盐中腐蚀后，试验钢呈现非均匀腐蚀形貌，在550℃和500℃下呈现均匀腐蚀形貌，腐蚀内层主要由铁、铬氧化物组成，铬元素含量随温度升高而减少；在550℃ KCl-75% K2SO4熔盐中腐蚀形成的腐蚀内层厚度为83.8 μm，比在550℃ KCl-25% K2SO4熔盐中形成的厚了近1倍，且腐蚀内层更致密、孔洞更小。
锅炉
12Cr1MoV钢
碱金属熔盐
腐蚀
biomass
boiler
12Cr1MoV steel
alkali metal molten salt
corrosion
Abstract
Corrosion tests in KCl-K2SO4 molten salts with different composition at different temperatures (500, 550, 600℃) were conducted on 12Cr1MoV steel. The effects of temperature and molten salt composition on corrosion kinetics, corrosion morphology and corrosion products of the tested steel were studied. The results show that with the rise of temperature or with the increase of K2SO4 content in molten salts, the corrosion of the tested steel increased. After corrosion in KCl-25wt%K2SO4 molten salt at 600℃, a large number of holes existed on surface of the tested steel and the corrosion products were granular; after corrosion in KCl-75wt%K2SO4 molten salt at 600℃, few holes existed on surface of the tested steel and the corrosion products were flake. The tested steel presented uneven corrosion morphology after corrosion in KCl-25wt%K2SO4 molten salt at 600℃ while showed uniform corrosion morphology at 550℃ and 500℃. The inner corrosion layer was composed of oxides of Fe and Cr, and the Cr content decreased with the temperature rising. The thickness of inner corrosion layer formed during corrosion in KCl-75wt%K2SO4 molten salt at 550℃ was 83.8 μm, nearly twice that formed in KCl-25wt%K2SO4 molten salt at 550℃, and the inner corrosion layer was relatively dense and the holes were relatively small.
中图分类号 TG178 DOI 10.11973/jxgccl201811001
所属栏目 试验研究
基金项目 国家自然科学基金资助项目（51275058）
收稿日期 2017/8/3
修改稿日期 2018/7/13
网络出版日期
作者单位点击查看
备注王刚(1992-),男,江苏连云港人,硕士研究生
引用该论文: WANG Gang,HE Jianjun,LI Wei,LIU Chen,LIU Zhenyao. Corrosion Behavior of 12Cr1MoV Steel in Alkali Metal Sulfur-chloride Salt[J]. Materials for mechancial engineering, 2018, 42(11): 1～5
王刚,何建军,李微,刘晨,刘震瑶. 12Cr1MoV钢在碱金属硫氯盐中的腐蚀行为[J]. 机械工程材料, 2018, 42(11): 1～5
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【13】李灼贤, 王准, 余春江. 生物质锅炉典型过热器金属材料表面钝化膜腐蚀特性研究[J]. 能源工程, 2015(3):34-37.
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