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Cavitation erosion and corrosion behaviors of laser-aluminized mild steel
C.T. Kwok1; F.T. Cheng2; H.C. Man3
2006-03-15
Source PublicationSurface and Coatings Technology
ISSN0257-8972
Volume200Issue:11Pages:3544-3552
Abstract

Laser surface alloying (LSA) of mild steel AISI 1050 using aluminum alloy (AlFeSi) was attempted. LSA was conducted by a two-step process: the alloy powder was preplaced on the surface of the substrate by flame spraying and the preplaced layer was subsequently remelted using a 2.5-kW CW Nd:YAG laser beam. The microstructures of the alloyed layers were studied by scanning electron 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, respectively. The laser-aluminized layer was found to consist of a ferritic matrix reinforced with the intermetallic phases Fe3 Al, FeAl, and tiny amount of Fe2Al5. The maximum hardness achieved was 595 Hv. The cavitation erosion resistance of the laser-aluminized specimens was much higher than that of the substrate (about 17 times) due to the presence of Fe3Al, FeAl, and solid solution hardened α-ferrite. Although alloying of aluminum to the steel led to an active shift in the free corrosion potential from -610 mV to -880 mV, the specimens showed passivity with pitting and protection potentials of -650 mV and -717 mV, respectively, while the steel substrate did not. The corrosion resistance of the specimens was significantly improved after laser aluminization as evidenced by a much lower corrosion current density. 

KeywordAisi 1050 Mild Steel Aluminizing Cavitation Erosion Corrosion Laser Surface Alloying Reinforcement
DOIhttps://doi.org/10.1016/j.surfcoat.2004.12.016
URLView the original
Indexed BySCIE
Language英語English
WOS Research AreaMaterials Science ; Physics
WOS SubjectMaterials Science, Coatings & Films ; Physics, Applied
WOS IDWOS:000235865000021
PublisherELSEVIER SCIENCE SA, PO BOX 564, 1001 LAUSANNE, SWITZERLAND
The Source to ArticleScopus
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Cited Times [WOS]:44   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionDEPARTMENT OF ELECTROMECHANICAL ENGINEERING
Corresponding AuthorF.T. Cheng
Affiliation1.Department of Electromechanical Engineering, Faculty of Science and Technology, University of Macau, P.O. Box 3001, Taipa, Macau, China
2.Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
3.Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
First Author AffilicationFaculty of Science and Technology
Recommended Citation
GB/T 7714
C.T. Kwok,F.T. Cheng,H.C. Man. Cavitation erosion and corrosion behaviors of laser-aluminized mild steel[J]. Surface and Coatings Technology,2006,200(11):3544-3552.
APA C.T. Kwok,F.T. Cheng,&H.C. Man.(2006).Cavitation erosion and corrosion behaviors of laser-aluminized mild steel.Surface and Coatings Technology,200(11),3544-3552.
MLA C.T. Kwok,et al."Cavitation erosion and corrosion behaviors of laser-aluminized mild steel".Surface and Coatings Technology 200.11(2006):3544-3552.
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