Electrochemical and surface investigation of zirconium based metallic glass Zr59Ti3Cu20Al10Ni8 alloy in nitric acid and sodium chloride media

Corrosion behavior of Zr-based metallic glass coating on type 304L stainless steel by pulsed laser deposition method

“…However as shown in Fig. 5, there is some discrepancy observed in the potentiodynamic polarization results between the same MG alloy with our recent work [6]. The reason for this can be attributed to complexity of the process of metal dissolution involved in HNO 3 , as different metals and alloys are known to exhibit different rates of dissolution in nitric acid under comparable experimental conditions [27,28].…”

“…As shown in Table 1, for MG Zr 59 Ti 3 Cu 20 Al 10 Ni 8 alloy increase in i pass followed by decrease of E TP was observed with increase in nitric acid concentration. In higher nitric acid concentration increased redox potential of the HNO 3 /HNO 2 system with relatively high rate of the autocatalytic reaction is expected which aid faster transpassive dissolution [6,30]. As a consequence, enhanced dissolution is expected in highly aggressive 11.5 M HNO 3 medium.…”

“…This could be due to uniform and more protective passive film formation with low electronic conductivity, which is a typical behavior of valve-metals, e.g. Zr, Ti, Al, Hf, Nb, and Ta [6,31,32]. The passive films formed in Zr-based metallic amorphous alloys are complex films consisting mostly of ZrO 2 as a major oxide species along with oxides of other alloying elements [4,[31][32][33].…”

“…This further aggravated with increase in temperature and at higher concentrations in presence of oxidizing ions [37]. The methods for improving the corrosion resistance of amorphous MG alloys include [3,5,6,[31][32][33][34]; (a) changing the surface composition or structure, (b) decreasing the free volume to prevent vacancies and voids formation and (c) adding alloying elements possessing strong ability to passivate. However, since the mechanism for corrosion of Zr-based MGs and coated MG has not been fully understood.…”

“…Compared to crystalline counterparts, amorphous MG alloys possess unique properties of high strength, high elastic limit, relatively low Young's modulus, good wear resistance, magnetic properties, fatigue endurance, and corrosion resistance [1][2][3]. Among bulk glass-forming system, Zr-based multi-component alloys possess great potential for application in nitric acid environment [4][5][6], in comparison with conventional materials such as AISI 304L stainless steel (SS) which undergoes severe general and intergranular corrosion (IGC) attacks in concentrated nitric acid media [7]. Zirconium based alloys are important materials in nuclear industry due to low neutron absorption coefficient and high corrosion resistance [7,8].…”