Synergistic Effect of Mo,W, Mn and Cr on the Passivation Behavior of a Fe-Based Amorphous Alloy Coating |
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| Authors: | Wan-Ping Tian Hong-Wang Yang Suo-De Zhang |
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| Affiliation: | 1.School of Materials Science and Engineering Shenyang University of Technology Shenyang China2.Shenyang National Laboratory for Materials Science, Institute of Metal Research Chinese Academy Sciences Shenyang China |
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| Abstract: | In this work, the electrochemical behaviors of SAM2 X5 Fe-based amorphous alloy coating and hard chromium coating were comparatively studied in 3.5 wt% Na Cl solution. In comparison with the hard chromium coating, the SAM2 X5 coating exhibited a wider and stable passive region with lower passive current density in the potentiodynamic polarization and showed a considerably lower current density at different anodic potentials in the potentiostatic polarization. In order to understand the passivation mechanism of the Fe-based amorphous coating, the components of the passive films formed at various polarization potentials were examined by X-ray photoelectron spectroscopy. The synergistic effect of Mo, W, Mn and Cr in the passive films was systemically analyzed. It has been revealed that Mo and W facilitate the formation of compact and stable Cr_2O_3 passive film at lower potentials, and the substantial enrichment of Mn in the passive film enhances the passivation ability at relatively higher potentials. The deep understanding of the passivation characteristics in multicomponent alloy systems could provide a guide for the design of corrosion-resistant amorphous alloy coatings for engineering applications. |
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| Keywords: | Amorphous alloy Metallic coating Passivation Surface film X-ray photoelectron spectroscopy (XPS) |
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