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| PITTING CORROSION RESISTANCE OF NANO-SiC POWDERS REINFORCED CAST STAINLESS STEEL |
| CHEN Meiling; LIU Yuandong; YANG Li; YANG Jun; GAO Hong |
| School of Materials Science and Engineering; Dalian Jiaotong University; Dalian 116028 |
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Abstract Cast austenitic stainless steels reinforced by modified SiC nano-powders have been prepared with pour over process under industrial conditions, and the effect of modified SiC nano-powders on the pitting corrosion resistance of the austenitic stainless steel was characterized by pitting chemistry immersion and pitting electrochemistry tests, metallographic analysis, SEM and energy dispersive analysis. The results showed that, compared with the samples without SiC nano-powders, the reinforced stainless steel was characterized with finer microstructure, and less ferrite precipitation owing to composition segregational the pitting corrosion velocity had decreased by 16% and the electric potential increased by three times respectively when the content of nano-SiC rose to 0.1 mass%. Furthermore, the results of energy dispersive analysis of samples with the scanning electron microscopy revealed that the Cr segregation in the reinforced austenitic stainless steels reduced, and the Cr depletion in such zones sensitive to pitting corrosion as grain boundaries has been improved.
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Received: 11 April 2008
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Corresponding Authors:
CHEN Meiling
E-mail: chenml@djtu.edu.cn
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