Laser surface alloying of Mn-Ni-Al bronze for cavitation erosion resistance

C. T. Kwok, P. K. Wong, W. K. Chan, F. T. Cheng, Hau Chung Man

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

4 Citations (Scopus)

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.
Original languageEnglish
Title of host publication29th International Congress on Applications of Lasers and Electro-Optics, ICALEO 2010 - Congress Proceedings
Pages1518-1524
Number of pages7
Volume103
Publication statusPublished - 27 Dec 2010
Event29th International Congress on Applications of Lasers and Electro-Optics, ICALEO 2010 - Anaheim, CA, United States
Duration: 26 Sep 201030 Sep 2010

Conference

Conference29th International Congress on Applications of Lasers and Electro-Optics, ICALEO 2010
CountryUnited States
CityAnaheim, CA
Period26/09/1030/09/10

Keywords

  • Cavitation erosion
  • Corrosion
  • Laser surface alloying
  • Nd:YAG laser

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Radiation

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