Corrosion behaviors of coatings fabricated using bulk metallic glass powders with the composition of Fe^sub 68.5^C^sub 7.1^Si^sub 3.3^B^sub 5.5^P^sub 8.7^Cr^sub 2.3^Mo^sub 2.5^Al^sub 2.0

• Published in: Metals and materials international 2012-08, Vol.18 (4), p.607
• Main Authors: Wang, S L, Li, H X, Hwang, S Y, Choi, S D, Yi, S
• Format: Article
• Language: English
• ISSN: 1598-9623; 2005-4149
• DOI: 10.1007/s12540-012-4006-y

Two different types of coatings were prepared, by a high velocity oxy-fuel spraying method and a laser spraying method, respectively, using bulk metallic glass powders with the nominal composition of Fe^sub 68.5^C^sub 7.1^Si^sub 3.3^B^sub 5.5^P^sub 8.7^Cr^sub 2.3^Mo^sub 2.5^Al^sub 2.0^. The corrosion behaviors of the two coatings in 1M HCl, H2SO^sub 4^, NaCl and NaOH solutions were investigated based upon the microstructural differences originating from the different coating methods. The amorphous coating layer formed by the high velocity oxy-fuel spraying method exhibited higher, excellent corrosion resistance in the 1M HCl solution. The coating layer formed by the laser spraying method exhibited a high pitting tendency attributed to the dendritic microstructure with various borides and carbides. Due to a great number of pores, the HVOF coating exhibits slightly lower corrosion resistance than the LS coating in alkaline solution.[PUBLICATION ABSTRACT]