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Laser surface alloying of Mn-Ni-Al bronze for cavitation erosion resistance
Alternative TitleP. K. Wong1, W. K. Chan1, F. T. Cheng2, and H. C. Man3
C.T. Kwok1; P.K. Wong1; W.K. Chan1; F.T. Cheng2; H.C. Man3
2010-12-27
Conference Name29th International Congress on Applications of Lasers and Electro-Optics, ICALEO 2010
Source Publication29th International Congress on Applications of Lasers and Electro-Optics, ICALEO 2010 - Congress Proceedings
Volume103
Pages1518-1524
Conference DateSepr 27-30, 2010
Conference PlaceAnaheim
CountryUSA
Abstract

Cavitation erosion of a metal surface is caused by the repeated nucleation, growth and collapse of cavities in vibratory and high-speed flowing liquid. It occurs on surfaces including propellers, pipelines, valves, pump impellers and casings, many of which are made of copper alloys. In order to improve the cavitation erosion resistance of Mn-Ni-Al bronze (MAB), alloyed layers of Cr, Ni, Nb and Mo with MAB substrate were achieved by laser surface alloying (LSA) using a 2.5-kW continuous wave Nd:YAG laser. The laser-alloyed layers have a thickness of about 400 to 450 μm and exhibit very fine microstructure. The microstructure, hardness, corrosion, cavitation erosion resistance of the laser-alloyed specimens were studied and compared with the asreceived MAB substrate. The micro-hardness of the alloyed layers was significantly increased. The cavitation erosion and corrosion behavior of the LSA coatings in 3.5% NaCl solution at 25°C was studied with a vibratory cavitation tester and a potentiostat. The cavitation erosion resistance of the alloyed layers was improved by at most 7.5 times that of the as-received MAB. In addition, the corrosion resistance of the alloyed layers was also enhanced as reflected by the shift in the corrosion potential and reduction in current density.

KeywordCavitation Erosion Corrosion Laser Surface Alloying Nd:Yag Laser
DOIhttps://doi.org/10.2351/1.5062012
URLView the original
Language英语
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Document TypeConference paper
CollectionDEPARTMENT OF ELECTROMECHANICAL ENGINEERING
Affiliation1.Department of Electromechanical Engineering, University of Macau
2.Department of Applied Physics, The Hong Kong Polytechnic University
3.Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University
First Author AffilicationUniversity of Macau
Recommended Citation
GB/T 7714
C.T. Kwok,P.K. Wong,W.K. Chan,et al. Laser surface alloying of Mn-Ni-Al bronze for cavitation erosion resistance[C],2010:1518-1524.
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