UM  > Faculty of Science and Technology  > DEPARTMENT OF ELECTROMECHANICAL ENGINEERING
Laser surface aluminizing of mild steel: Microstructural and corrosion characteristics
C. T. Kwok1; H. C. Man2; F. T. Cheng3
2002-12-01
Conference NameICALEO 2002 - 21st International Congress on Applications of Laser and Electro-Optics
Source PublicationICALEO 2002 - 21st International Congress on Applications of Laser and Electro-Optics, Congress Proceedings
Conference Date14-17 October 2002
Conference PlaceScottsdale, AZ
Abstract

Laser surface alloying of mild steel AISI 1050 using aluminum alloy (AlFeSi) was attempted. Alloying material in powder form was preplaced on the surface of the substrate by oxyfuel flame spraying. The surface was then consolidated by scanning with a 2-kW CW Nd:YAG laser beam. The micro structures of the alloyed layers were studied by scanning electron microscopy, optical microscopy and X-ray diffractometry. The corrosion and cavitation-erosion characteristics in 3.5% NaCl solution at 23 °C were studied by potentiodynamic polarization technique and by means of a 20 kHz ultrasonic vibratory facility. The laser-alloyed specimens were found to be composed of ferrite and the intermetallic phases FeAl, FeAl and Fe Al. The maximum hardness was significantly increased to 595 Hv. The corrosion behaviour was influenced by the degree of dilution of the alloying element. Although aluminizing led to an active shift in the corrosion potential from -510 mV to -890 mV, the specimens showed passivity with pitting and protection potentials of -550 mV and -710 mV respectively while the substrate did not. The corrosion resistance of the laser-alloyed specimens was significantly improved as evidenced by a much lower corrosion current density. In addition, the cavitation-erosion resistance of the laser-alloyed specimens was also significantly improved by 17.7 times that of the substrate due to the increase in both hardness and corrosion resistance of the laser-alloyed layer.

DOIhttps://doi.org/10.2351/1.5065767
URLView the original
Language英語English
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Document TypeConference paper
CollectionDEPARTMENT OF ELECTROMECHANICAL ENGINEERING
Affiliation1.Department of Electromechanical Engineering, Faculty of Science & Technology, University of Macau, P.O. Box 3001, Taipa, Macau, China
2.Department of Industrial & Systems Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
3.Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
First Author AffilicationUniversity of Macau
Recommended Citation
GB/T 7714
C. T. Kwok,H. C. Man,F. T. Cheng. Laser surface aluminizing of mild steel: Microstructural and corrosion characteristics[C],2002.
APA C. T. Kwok,H. C. Man,&F. T. Cheng.(2002).Laser surface aluminizing of mild steel: Microstructural and corrosion characteristics.ICALEO 2002 - 21st International Congress on Applications of Laser and Electro-Optics, Congress Proceedings.
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