Effect of high-temperature furnace treatment on the microstructure and corrosion behavior of NiCrBSi flame-sprayed coatings

• DOI: 10.1016/j.corsci.2014.07.057
• Publication Date: 2014-08-04T05:30:23Z
• Authors: Zoran Bergant; Uroš Trdan; Janez Grum
• Keywords: 02 engineering and technology; 0210 nano-technology

Abstract The microstructure and corrosion properties of flame-sprayed and heat-treated NiCrBSi coating on low-carbon steel are analyzed using an optical microscope, SEM/EDS and cyclic polarization electrochemical tests. Heat treatment was performed at 930 °C, 1040 °C and 1080 °C for 10 and 20 min where densification of the coating occurred. Electrochemical corrosion tests in a 3.5 wt.% NaCl solution were performed on a low-carbon mild steel substrate, as-sprayed coating and on furnace treated coating partially melted and fused between solidus and liquidus points at 1080 °C to evaluate the influence of heat treatment on corrosion resistance.