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

doi:10.13374/j.issn2095-9389.2017.06.010

Volume 39 Issue 6

Jun. 2017

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YU Ming-fei, XIANG Song, MA Guo-qiang, SHI Wei, YU Wen, JI Xuan-ming. Effects of fluoride ions on corrosion resistance of stainless steel in high-temperature concentrated sulfuric acid[J]. Chinese Journal of Engineering, 2017, 39(6): 882-888. doi: 10.13374/j.issn2095-9389.2017.06.010

Citation:

YU Ming-fei, XIANG Song, MA Guo-qiang, SHI Wei, YU Wen, JI Xuan-ming. Effects of fluoride ions on corrosion resistance of stainless steel in high-temperature concentrated sulfuric acid[J]. Chinese Journal of Engineering, 2017, 39(6): 882-888. doi: 10.13374/j.issn2095-9389.2017.06.010

Citation:

YU Ming-fei, XIANG Song, MA Guo-qiang, SHI Wei, YU Wen, JI Xuan-ming. Effects of fluoride ions on corrosion resistance of stainless steel in high-temperature concentrated sulfuric acid[J]. Chinese Journal of Engineering, 2017, 39(6): 882-888. doi: 10.13374/j.issn2095-9389.2017.06.010

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Effects of fluoride ions on corrosion resistance of stainless steel in high-temperature concentrated sulfuric acid

doi: 10.13374/j.issn2095-9389.2017.06.010

YU Ming-fei¹,
XIANG Song^{1,2,3
,
,},
MA Guo-qiang¹,
SHI Wei^1,2,3,
YU Wen¹,
JI Xuan-ming¹

1) College of Materials and Metallurgy, Guizhou University, Guiyang 550025, China
2) Guizhou Key Laboratory for Mechanical Behavior and Micro-Structure of Materials, Guizhou University, Guiyang 550025, China
3) National with Local Engineering Laboratory for High Performance Metal Structure Materials and Manufacturing Techniques, Guizhou University, Guiyang 550025, China

Received Date: 2016-09-08

Abstract

Abstract

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.
- stainless steel,
- high-temperature concentrated sulfuric acid,
- electrochemical,
- fluoride ion,
- corrosion

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References(9)

References

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