| Status | 已發表Published |
| Hydrogen Embrittlement and Corrosion of Laser-Surface Melted AISI 430 Ferritic Stainless Steel | |
Chan, W. K. ; Kwok, C. T.; Lo, K. H.
| |
| 2013-11-01 | |
| Source Publication | Proceedings of NACE International East Asia & Pacific Rim Area Conference & Expo 2013
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| Publication Place | Japan |
| Publisher | NACE International |
| Abstract | In the present study, the feasibility of laser surface melting (LSM) of a ferritic stainless steel (AISI 430) for minimizing the effect of hydrogen embrittlement and improving pitting corrosion resistance was investigated. LSM of AISI 430 was successfully achieved by a 2.3-kW high power diode laser (HPDL). Hydrogen was introduced into the laser-surface melted 430 by cathodic charging in the 0.1 M NaOH solution under galvanostatic conditions at a current density of 30 mA/cm2 at 25 degC. The degree of embrittlement caused by hydrogen for the charged and non-charged specimens was assessed by slow strain rate tensile (SSRT) test in air at strain rate of 3x10.5 s-1. Potentiodynamic polarization test for the laser-surface melted 430 in 3.5 wt% NaCl solution at 25 degC was performed by using a potentiostat. Hydrogen-charged specimen showed a dramatic decrease in ductility, while the laser-surface melted specimen showed a higher tensile strength and improved toughness as compared with the as-received one. The laser-surface melted specimen after hydrogen charging showed similar results as the hydrogen-charged one. Compared with the as-received AISI 430, the pitting corrosion resistance of the laser-surface melted AISI 430 was found to be significantly improved as reflected by the noble shift in pitting potential and reduction in passive current density attributed to a more homogenous compositions. |
| Keyword | hydrogen embrittlement pitting corrosion AISI 430 laser surface melting HPDL |
| Language | 英語English |
| The Source to Article | PB_Publication |
| PUB ID | 12803 |
| Document Type | Conference paper |
| Collection | DEPARTMENT OF ELECTROMECHANICAL ENGINEERING |
| Recommended Citation GB/T 7714 | Chan, W. K.,Kwok, C. T.,Lo, K. H.. Hydrogen Embrittlement and Corrosion of Laser-Surface Melted AISI 430 Ferritic Stainless Steel[C], Japan:NACE International, 2013. |
| APA | Chan, W. K.., Kwok, C. T.., & Lo, K. H. (2013). Hydrogen Embrittlement and Corrosion of Laser-Surface Melted AISI 430 Ferritic Stainless Steel. Proceedings of NACE International East Asia & Pacific Rim Area Conference & Expo 2013. |
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