| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1468821 | Corrosion Science | 2014 | 15 Pages |
•Heat treatment significantly reduces area porosity in NiCrBSi coatings.•Surface roughness decrease as a consequence of subsequent heat treatment.•Heat treatment at 1080 °C eliminates the network of interconnected porosity.•Subsequent heat treatment improves the corrosion resistance of NiCrBSi coating.•Heat treatment reduces pitting initiation rate and improves the ability to repassivate.
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.
