Volume no :8, Issue no: 1, July 2013

Journal of Materials Science and Engineering with Advanced Technology

INFLUENCES OF SPRAYING PARAMETERS ON POROSITY LEVEL AND CORROSION RATE OF ATMOSPHERIC PLASMA SPRAYED ALUMINA COATINGS ON AZ31B MAGNESIUM ALLOY

Author's: D. THIRUMALAIKUMARASAMY, K. SHANMUGAM and V. BALASUBRAMANIAN
Pages: [27] - [53]
Received Date: January 11, 2013; Revised July 29, 2013
Submitted by:
DOI: 10-1155-2013-794108

Abstract

This paper reports a study of how the choice of plasma spray parameters, used during deposition of coatings on AZ31B magnesium alloy, influences the porosity level and corrosion rate of such coatings. The coating porosity was evaluated by using a digital image analysis method. Corrosion tests were performed for the sprayed alumina coatings in a 3.5% NaCl solution by using an immersion corrosion test. The microstructure and phase structure of the sprayed coatings were investigated by using a scanning electron microscope (SEM), X-ray diffraction (XRD), and an energy dispersive spectrometer (EDS). The results indicate that the input power has the greatest influence on porosity level and corrosion rate, followed by stand-off distance and powder feed rate.

Keywords

atmospheric plasma spraying, alumina coating, porosity, corrosion rate.