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《Chinese Journal of Engineering》 2017-06
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Effects of fluoride ions on corrosion resistance of stainless steel in high-temperature concentrated sulfuric acid

YU Ming-fei;XIANG Song;MA Guo-qiang;SHI Wei;YU Wen;JI Xuan-ming;College of Materials and Metallurgy,Guizhou University;Guizhou Key Laboratory for Mechanical Behavior and Micro-Structure of Materials,Guizhou University;National with Local Engineering Laboratory for High Performance Metal Structure Materials and Manufacturing Techniques,Guizhou University;  
The effects of fluoride ions on the corrosion resistance of 304,2507,and 904L stainless steels in high-temperature concentrated sulfuric acid were investigated by immersion and electrochemical tests as well as scanning electron microscopy(SEM)and energy-dispersive X-ray spectroscopy(EDS) analyses.The results show that the corrosion resistances of these three stainless steels improve when fluoride ions are added in high-temperature concentrated sulfuric acid.Of the three,the corrosion resistance of 904L is more stable and reliable.The nickel sulfide formed in sulfuric acid,which is thermodynamically unstable,causes active-passive transition.The corrosion resistance of stainless steel increases upon the addition of fluorine ions because the nickel and fluorine ions form a more stable compound to replace nickel sulfide.
【Fund】: 国家自然科学基金资助项目(51661006 51361004 51574095);; 贵州省百层次创新型人才资助项目(20164014);; 贵州省科技计划资助项目(20142003);; 贵州省教育厅创新群体重大研究项目(2016021)
【CateGory Index】: TG142.71;TQ051.5
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