Electrochemical and chemical corrosion behaviors of the in-situ Zr-based metallic glass matrix composites in chloride-containing solutions

• Published in: Journal of alloys and compounds 2019-01, Vol.770, p.679-685
• Main Authors: Wang, B., Xu, K.K., Shi, X.H., Zhang, M., Qiao, J.W., Gao, C.H., Wu, Y.C.
• Format: Article
• Language: English
• Subjects: Alloys; Amorphous materials; Bulk metallic glass; Calcium chloride; Calcium ions; Composite materials; Corrosion currents; Corrosion potential; Corrosion resistance; Glass matrix composites; Immersion tests (corrosion); Metallic glass matrix composites; Metallic glasses; Molds; Niobium oxides; Organic chemistry; Oxide coatings; Particulate composites; Pitting corrosion; Pitting potential; Protective coatings; Radium; Sodium chloride; Titanium dioxide; Zirconium base alloys; Zirconium dioxide; Zr alloy
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2018.08.174

The Zr58.5Ti14.3Nb5.2Cu6.1Ni4.9Be11 metallic glass matrix composites (MGMCs) were prepared by copper mould casting. The corrosion resistance and the pitting susceptibility of Zr-based MGMCs were tested in 1M KCl, 1M NaCl, and 0.5M CaCl2 solutions by potentiodynamic polarization tests and chemical immersion measurements. As a result, the corrosion current density is the smallest, and the pitting potential is the largest in 0.5 M CaCl2 solutions due to the smallest radium of Ca2+, which indicates that the Zr-based MGMCs have better corrosion resistance. On the contrary, the corrosion resistance of Zr-based MGMCs in 0.5M CaCl2 solutions is poor during the immersion tests, which corresponds to the result of roughness. Further investigation of XPS indicates that oxide films are mainly composed of ZrO2, TiO2, and Nb2O5 formed on the surface of the Zr-based MGMCs. However, the oxide films formed in 0.5M CaCl2 solutions possess the worst protective effect due to the lower contents of ZrO2, TiO2, and Nb2O5, whereas the oxide films formed in 1M NaCl solutions possess the best protective effect. •The corrosion resistance of Zr-based MGMCs were tested in 1M KCl, 1M NaCl, and 0.5M CaCl2 solutions.•The corrosion current density is the smallest in 0.5 M CaCl2 solutions due to the smallest radium of Ca2+.•Oxide films formed on the surface are mainly composed of ZrO2, TiO2, and Nb2O5.