Effect of nitrogen addition on microstructure and erosion-corrosion behavior of stainless steel in acidic slurry
Effect of nitrogen content on the microstructure and erosion-corrosion (E-C) behavior of stainless steel (containing about 25%Cr, 5%–6%Ni, and 1%–2%Mo) was investigated by using optical microscope(OM),potentiodynamic polarization curve and immersion method, a self-made rotating disk apparatus and sc...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Foundry Journal Agency
2009-08-01
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| Series: | China Foundry |
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| Online Access: | http://www.foundryworld.com/uploadfile/200912130399861.pdf |
| _version_ | 1819129305184075776 |
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| author | Li Ping Cai Qizhou Wei Bo kang |
| author_facet | Li Ping Cai Qizhou Wei Bo kang |
| author_sort | Li Ping |
| collection | DOAJ |
| description | Effect of nitrogen content on the microstructure and erosion-corrosion (E-C) behavior of stainless steel (containing about 25%Cr, 5%–6%Ni, and 1%–2%Mo) was investigated by using optical microscope(OM),potentiodynamic polarization curve and immersion method, a self-made rotating disk apparatus and scanning electron microscopy (SEM) and so on. The results show that with the increase of nitrogen content from 0 (no adding) to 0.485 wt.%, the Creq/Nieq ratio of the tested materials decreases from 4.14 to 1.23 and the ferrite volume percentage of the steel tested linearly decreases approximately from 90% to 10%. The effect of nitrogen content on polarization behavior of the studied steel was not signifi cant. All the passive current densities ( Ip)and pure corrosion rates (Vc) of the different N content specimens in the acidic solution (slurry containing 0.1 M H2SO4+0.06%Cl-+0.4%F-, the simplifi ed zinc hydrometallurgy slurry) are too low and nearly negligible. Whereas the pure erosion rates (Ve ) of the four scenarios of the steels tested (N content, wt.%: N1, no adding; N2, 0.143%; N3, 0.289%; N4, 0485%, respectively) are much higher than their Vc values. The V e values of the tested steels are in the order of N4 > N1 > N3 > N2, at the same time, the total weight loss rates (V t ) follow the order of N4 > N1 >N3 > N2, too. N2 steel consisting of pproximately equal volume fractions of ferrite (α) and austenite (c) exhibits the most excellent E-C resistance and erosion resistance, while the stainless steels possessing the big difference between α phase and c phase, such as N1 steel nearly possessing single ferrite or N4 steel nearly possessing single austenite, show poorer E-C resistance and erosion resistance. |
| first_indexed | 2024-12-22T08:41:36Z |
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| institution | Directory Open Access Journal |
| issn | 1672-6421 |
| language | English |
| last_indexed | 2024-12-22T08:41:36Z |
| publishDate | 2009-08-01 |
| publisher | Foundry Journal Agency |
| record_format | Article |
| series | China Foundry |
| spelling | doaj.art-fd6b0333c42b4d8eb8888fb2534c7b612022-12-21T18:32:13ZengFoundry Journal AgencyChina Foundry1672-64212009-08-0163197201Effect of nitrogen addition on microstructure and erosion-corrosion behavior of stainless steel in acidic slurryLi PingCai QizhouWei Bo kangEffect of nitrogen content on the microstructure and erosion-corrosion (E-C) behavior of stainless steel (containing about 25%Cr, 5%–6%Ni, and 1%–2%Mo) was investigated by using optical microscope(OM),potentiodynamic polarization curve and immersion method, a self-made rotating disk apparatus and scanning electron microscopy (SEM) and so on. The results show that with the increase of nitrogen content from 0 (no adding) to 0.485 wt.%, the Creq/Nieq ratio of the tested materials decreases from 4.14 to 1.23 and the ferrite volume percentage of the steel tested linearly decreases approximately from 90% to 10%. The effect of nitrogen content on polarization behavior of the studied steel was not signifi cant. All the passive current densities ( Ip)and pure corrosion rates (Vc) of the different N content specimens in the acidic solution (slurry containing 0.1 M H2SO4+0.06%Cl-+0.4%F-, the simplifi ed zinc hydrometallurgy slurry) are too low and nearly negligible. Whereas the pure erosion rates (Ve ) of the four scenarios of the steels tested (N content, wt.%: N1, no adding; N2, 0.143%; N3, 0.289%; N4, 0485%, respectively) are much higher than their Vc values. The V e values of the tested steels are in the order of N4 > N1 > N3 > N2, at the same time, the total weight loss rates (V t ) follow the order of N4 > N1 >N3 > N2, too. N2 steel consisting of pproximately equal volume fractions of ferrite (α) and austenite (c) exhibits the most excellent E-C resistance and erosion resistance, while the stainless steels possessing the big difference between α phase and c phase, such as N1 steel nearly possessing single ferrite or N4 steel nearly possessing single austenite, show poorer E-C resistance and erosion resistance.http://www.foundryworld.com/uploadfile/200912130399861.pdfnitrogenmicrostructureerosion-corrosion (E-C)duplex stainless steels |
| spellingShingle | Li Ping Cai Qizhou Wei Bo kang Effect of nitrogen addition on microstructure and erosion-corrosion behavior of stainless steel in acidic slurry China Foundry nitrogen microstructure erosion-corrosion (E-C) duplex stainless steels |
| title | Effect of nitrogen addition on microstructure and erosion-corrosion behavior of stainless steel in acidic slurry |
| title_full | Effect of nitrogen addition on microstructure and erosion-corrosion behavior of stainless steel in acidic slurry |
| title_fullStr | Effect of nitrogen addition on microstructure and erosion-corrosion behavior of stainless steel in acidic slurry |
| title_full_unstemmed | Effect of nitrogen addition on microstructure and erosion-corrosion behavior of stainless steel in acidic slurry |
| title_short | Effect of nitrogen addition on microstructure and erosion-corrosion behavior of stainless steel in acidic slurry |
| title_sort | effect of nitrogen addition on microstructure and erosion corrosion behavior of stainless steel in acidic slurry |
| topic | nitrogen microstructure erosion-corrosion (E-C) duplex stainless steels |
| url | http://www.foundryworld.com/uploadfile/200912130399861.pdf |
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