Abstract
Certain metals produce passive oxide film layers during use which are closely related to their corrosion resistance. The properties of the oxide film are strongly influenced by the oxygen content of the surrounding environment. This study aims to examine the impact of dissolved oxygen concentration on the corrosion and passive oxide film formed on Fe-based metallic glass coatings. In deoxygenated solutions, the coating was highly susceptible to corrosion, while exhibiting the highest corrosion potential in oxygenated solutions due to the formation of a dense oxide film. The impedance of the passive film was notably influenced by the presence of dissolved oxygen. In deoxygenated solutions, the impedance remained stable and at a minimum level. However, in oxygenated solutions, the impedance exhibited a significant increase accompanied by rapid film growth. The carrier concentration in the passive film remained low and constant in deoxygenated solutions but decreased in oxygenated ones. The composition of the passive film varied with dissolved oxygen concentration, leading to FeOOH formation in deoxygenated solutions and to the increase in Cr2O3/Cr(OH)3 ratio in oxygenated environments. Moreover, deoxygenated solutions slowed down the film growth rate, while oxygenated ones were conducive to the fast development of films, affecting their protective ability.
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