Enhancement of cavitation erosion and corrosion resistance of brass by laser surface alloying with Ni-Cr-Si-B

K. F. Tam, F. T. Cheng, Hau Chung Man

Research output: Journal article publicationJournal articleAcademic researchpeer-review

26 Citations (Scopus)

Abstract

Brass (Cu-38% Zn-1.5% Pb) was surface-alloyed with a hardfacing Ni-Cr-Si-B powder (Ni-16.5% Cr-3.5% Si-3.8% B-15.5% Fe-<1% C) using a high-power continuous-wave Nd-YAG laser with different processing parameters for improving the cavitation erosion and corrosion resistance in 3.5 wt.% NaCl solution. The cavitation erosion resistance Re(defined as the reciprocal of the mean erosion rate) of the alloyed layer ranged from 6.10- to 9.06-fold that of the brass substrate, and was found to be closely related to the hardness of the alloyed layer. The corrosion resistance was also improved, as indicated by a noble shift in the pitting potential and a reduction in the corrosion current density. The difference in the cavitation erosion and corrosion behavior of various specimens is discussed in relation to their microstructures and structures via studies using optical microscopy (OM), scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDX) and X-ray diffractometry (XRD). The present study also indicated that it is difficult to achieve maximum improvement in cavitation erosion and corrosion resistance simultaneously.
Original languageEnglish
Pages (from-to)36-44
Number of pages9
JournalSurface and Coatings Technology
Volume149
Issue number1
DOIs
Publication statusPublished - 1 Jan 2002

Keywords

  • Brass
  • Cavitation erosion
  • Corrosion
  • Laser surface alloying
  • Ni-Cr-Si-B

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Condensed Matter Physics
  • Surfaces and Interfaces

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