Effect of temperature, pH and sulphide on the cavitation erosion behaviour of super duplex stainless steel

C. T. Kwok, Hau Chung Man, L. K. Leung

Research output: Journal article publicationJournal articleAcademic researchpeer-review

60 Citations (Scopus)

Abstract

Cavitation erosion characteristics of super duplex stainless steel UNS S32760 in 3.5% NaCl solution with controlled temperature, pH value and sulphide content have been studied by means of a 20 kHz ultrasonic vibrator at a peak-to-peak amplitude of 50 μm. The erosion behaviour was compared with that of austenitic stainless steel UNS S30400. It was found that the mean depth of penetration rate (MDPR) for S32760 and S30400 initially increased with temperature from 10°C to 50°C, and reached a maximum at about 50°C and then decreased with further increase in temperature to 70°C. Results of MDPR versus pH at 23°C indicated that S32760 is more sensitive to change of pH than is S30400 at 23°C. Also, there exists a minimum MDPR at pH 9 for S32760. For S30400 and S32760 in 3.5% NaCl solution with various sulphide concentrations, the MDPR increased gradually as sulphide concentration was increased. S30400 was found to be more sensitive than S32760 to the effect of sulphide on cavitation erosion. The cavitation erosion behaviour of S32760 at varying temperature, pH and sulphide content is explained with the aid of polarisation studies.
Original languageEnglish
Pages (from-to)84-93
Number of pages10
JournalWear
Volume211
Issue number1
DOIs
Publication statusPublished - 1 Jan 1997

Keywords

  • Austenitic stainless steel
  • Cavitation erosion
  • pH
  • Sulphide
  • Super duplex stainless steel
  • Temperature

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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