化工学报2017，Vol.68Issue(8)：3202-3210,9.DOI:10.11949/j.issn.0438-1157.20170131
In625合金和316L不锈钢在NaCl-CaCl2-MgCl2熔盐中的腐蚀机理
Corrosion behavior of In625 alloy and 316L stainless steel in NaCl-CaCl2-MgCl2 ternary eutectic molten salt
摘要
Abstract
Isothermal corrosion of 316L stainless steel and nickel based Inconel 625 alloy was evaluated by total immersion in eutectic NaCl-CaCl2-MgCl2 molten salt at 500—700℃.The effect of chromium (Cr), air contact, and temperature on corrosion was studied. Corrosion dynamic and velocity curves of 316L and Inconel 625 alloy at 600℃ molten salt for 21 d were obtained. X-Ray diffraction (XRD), scanning electron microscope (SEM) and X-ray energy spectrometer (EDX) were used to analyze corrosion products and cross section morphologies. The results show that mass loss of the steel and alloy increases with the increase of air contact and corrosion temperature. Element and morphology of metal surface and cross section after 21 d immersion at 600℃ indicate that Cr has a preferential solubility to other elements, which Cr depletion region was observed across cross-section. The dense layer of corrosion products can reduce corrosion rate. Inconel 625 exhibits better corrosion resistance than austenitic stainless steel in NaCl-CaCl2-MgCl2 eutectic molten salt.关键词
氯化物熔盐/腐蚀/不锈钢/Inconel625镍基合金Key words
chloride molten salt/corrosion/stainless steel/nickel based Inconel 625 alloy分类
化学化工引用本文复制引用
刘波,魏小兰,王维龙,宋明,丁静..In625合金和316L不锈钢在NaCl-CaCl2-MgCl2熔盐中的腐蚀机理[J].化工学报,2017,68(8):3202-3210,9.基金项目
NSFC-盐湖集团联合基金项目(U1507121) （U1507121）
国家自然科学基金重点项目(51436009). supported by the NSFC-Salt Lake Group Joint Fund (U1507121) and the National Natural Science Foundation of China (51436009). （51436009）
