“…The significant improvement in the E pit of the Al-based BMG compared to the pure Al could be attributed to the addition of corrosion-resistant alloying elements and inhibition of stable pits growth by the metastable structure. 22,[39][40][41] Evolution of |Z| 10mHz under long-term immersion.-To have a preliminary understanding of the long-term corrosion for each zone of the Al-based BMG and pure Al in 0.001 M NaCl solution, a logarithmic presentation for the |Z| 10mHz (normalized) parameter of the whole immersion process is constructed and presented in Fig. 3.…”
The electrochemical characteristics and passive film stability of an Al86Ni6Y4.5Co2La1.5 bulk metallic glass were systematically investigated in a chloride containing solution by the combination of electrochemical impedance spectroscopy and high-resolution transmission electron microscopy observations. The results demonstrated that the evolution of corrosion could be divided into five distinct zones: film growth in the initial immersion, a complete passive film with a dynamic and stable process, the occurrence of pitting on the passive film, accumulation of corrosion products, and the formation of continuous channels to failure. Note that in the second zone, the passive film achieved the highest stability at the middle of immersion due to the synergistic effect of film doping and thickening induced by the alloying of Y/La and Ni/Co. Afterwards, a gradual degradation of the passive film was observed, which was associated with the partial devitrification of the Y2O3 and La2O3 amorphous passive film. Correspondingly, the film/metal matrix interface underwent a transition from a flat interface to a curved one during the immersion, inducing the failure of the passive film. Our findings provide guidance for the design of Al-based amorphous alloys with high corrosion resistance.
“…The significant improvement in the E pit of the Al-based BMG compared to the pure Al could be attributed to the addition of corrosion-resistant alloying elements and inhibition of stable pits growth by the metastable structure. 22,[39][40][41] Evolution of |Z| 10mHz under long-term immersion.-To have a preliminary understanding of the long-term corrosion for each zone of the Al-based BMG and pure Al in 0.001 M NaCl solution, a logarithmic presentation for the |Z| 10mHz (normalized) parameter of the whole immersion process is constructed and presented in Fig. 3.…”
The electrochemical characteristics and passive film stability of an Al86Ni6Y4.5Co2La1.5 bulk metallic glass were systematically investigated in a chloride containing solution by the combination of electrochemical impedance spectroscopy and high-resolution transmission electron microscopy observations. The results demonstrated that the evolution of corrosion could be divided into five distinct zones: film growth in the initial immersion, a complete passive film with a dynamic and stable process, the occurrence of pitting on the passive film, accumulation of corrosion products, and the formation of continuous channels to failure. Note that in the second zone, the passive film achieved the highest stability at the middle of immersion due to the synergistic effect of film doping and thickening induced by the alloying of Y/La and Ni/Co. Afterwards, a gradual degradation of the passive film was observed, which was associated with the partial devitrification of the Y2O3 and La2O3 amorphous passive film. Correspondingly, the film/metal matrix interface underwent a transition from a flat interface to a curved one during the immersion, inducing the failure of the passive film. Our findings provide guidance for the design of Al-based amorphous alloys with high corrosion resistance.
“…The effect of these extrinsic factors on the corrosion behaviour has already been discussed in 'Working environment' section, and the corrosion mechanism associated with some of the factors will be provided in this section to strengthen the understanding of extrinsic factor-corrosion property correlation. In a recently published article, Wang et al [295] addressed the temperature dependence of corrosion properties for Fe-based MG, and a schematic illustration of the related corrosion mechanism is shown in Figure 50. A significant increase in value of i pass was observed in MG at higher temperature without the occurrence of pitting corrosion (no critical pitting temperature value could be determined and higher pitting initiation temperature), in contrast to 316L SS which suffered severe pitting.…”
“…The sensitiveness for i pass with temperature was associated with reduction in amount of protective Cr 2 O 3 phase, increased defect concentration and decreased electronic work function in the film. Most importantly, prominent pitting resistance of MG at higher temperatures was attributed to two factors, namely (i) significantly impeded pit nucleation due to the presence of a homogeneous passive film along with (ii) constrained propagation of metastable pits. Figure 50. Schematic interpretation of corrosion process in Fe-based (Fe 49.7 Cr 18 Mn 1.9 Mo 7.4 W 1.6 B 15.2 C 3.8 Si 2.4 ) MG at different temperature in chloride-containing H 3 BO 3 solution: (a) low and (b) high temperature [295]. Cited figure has been reproduced with due permission from the publisher.…”
Section: Degradation Mechanisms In Fe-based Metallic Glass Coatingsmentioning
confidence: 99%
“…Schematic interpretation of corrosion process in Fe-based (Fe 49.7 Cr 18 Mn 1.9 Mo 7.4 W 1.6 B 15.2 C 3.8 Si 2.4 ) MG at different temperature in chloride-containing H 3 BO 3 solution: (a) low and (b) high temperature [295]. Cited figure has been reproduced with due permission from the publisher.…”
Section: Degradation Mechanisms In Fe-based Metallic Glass Coatingsmentioning
confidence: 99%
“…. Passive current of MG increased significantly without occurrence of pitting corrosion, in contrast to severe pitting for 316 SS at relatively higher temperature[295] (Continued)…”
Among various materials available for alleviating the corrosion-related degradation, thermal sprayed Fe-based metallic glass coatings (MGCs) have received huge attention from the scientific community due to the exceptional combination of mechanical and corrosion properties, along with commercially attractive low material cost of this particular alloy system. Emerging reports on the thermal sprayed Fe-based MGCs outperforming conventional corrosion-resistant materials and coatings have accelerated further exploration of this domain, resulting in an immense increase of research activities over the last few decades producing fascinating results. This review takes a holistic approach encompassing an in-depth assessment of all the relevant salient work till date, including corrosion properties, corresponding degradation mechanisms, metallurgical and environmental factors with reference to passive film dynamics and/or formation of corrosion products. Moreover, various strategies for improved corrosion properties and recent research progress have been reviewed with an attempt to identify the present knowledge gaps and the future research directions.
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