Chloride-ion induced corrosion has been considered as a major problem in oil, gas, and plant industries. Fe-based metallic glasses (MG) have attracted much interests in high temperature corrosion protection application due to their good glass forming ability[1], high mechanical strength, low materials cost and excellent corrosion resistance[2]. In this study, Fe-based metallic glass with corrosion resistance is developed for coating application. The microstructure and thermal properties of Fe-based metallic glasses are investigated with differential scanning calorimeter, X-ray diffraction with monochromatic Co-Ka radiation and scanning electron microscope. Corrosion behaviour of the Fe-based glasses are tested by measuring weight loss of initial materials during the long-term immersion in acid solution (100 days). Based on the results, high velocity oxygen fuel (HVOF) process is applied to fabricate corrosion protection coating layers for selected Fe-based MG glasses. Results showed that corrosion behaviour of Fe-based MG coating primarily relied on the uniformity of coatings' microstructure and depends on the alloy composition. In addition to this, corrosion behaviours and applicability of the developed Fe-based HVOF MG coating were tested in actual biomass boiler. Fe-based HVOF MG coating showed good thermal stability and offered excellent corrosion resistance as a protection layer.

References

[1] J, Shen, C. Qingjun, J. Sun, H. Fan, G. Wang, Appl. Phys.Lett 2005, 86, 151907

[2] A. Inoue; Acta Mater, 2000, 48, 279