Characterization and Corrosion Analysis of Electrodeposited Nanostructured Zn–Fe Alloy Coatings

Rashmi, D.; Pavithra, G. P.; Praveen, B. M.; Devapal, Deepa; Nayana, K. O.; Hebbar, Sudheendra P.

doi:10.1007/s40735-020-00380-9

Cited by 2 publications

(2 citation statements)

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“…In this study, the cyclic voltammogram indicated the electrodeposition processes of the Zn 2+ , Fe 2+ and Zn 2+ + Fe 2+ ions, respectively. As shown in Figure 5 , there was current loop in the cathodic branch of all the three voltammograms, which indicated the nucleation and grain growth process [ 28 , 47 ]. The electrodeposition initial potential of Zn–Fe alloy was similar to that of pure Zn, but the curve slope was larger than that of the latter, which demonstrated that the nucleation rate of ZFC was faster than ZC [ 48 ].…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, the corrosion resistance of conventional zinc coatings is not satisfactory in severe atmospheric conditions. Meanwhile, the excellent properties of coatings by Zn-iron group alloys, particularly Zn–Fe alloys, make them very promising materials as alternatives for zinc coatings of steel products [ 28 , 29 ]. Zn–Fe alloy coatings have many excellent properties, such as excellent corrosion resistance, prominent paintability and good welding properties in comparison to the zinc coating [ 30 , 31 ].…”

Section: Introductionmentioning

confidence: 99%

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Morphology and Anti-Corrosive Performance of Cr(III) Passivated Zn–Fe Alloy Coating on NdFeB Substrate

Zhou

Chen

et al. 2022

Materials

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In this study, low-iron Zn–Fe alloy coatings and pure Zn coatings, with or without trivalent chromium passivation treatment, were electrodeposited onto a sintered NdFeB magnet from a weak acid chloride bath. The surface morphology and structure of the coatings were then examined using the X-ray diffraction, a scanning electron microscope and 3D white-light interfering surface analysis. Meanwhile, the electrodeposition behavior and anti-corrosive properties of the coatings were investigated using cyclic voltammetry, potentiodynamic polarization, electrochemical impedance spectroscopy, and natural salt spray tests. The results indicate that a passivated Zn–Fe alloy coating with a 0.9 wt.% Fe content provided much better corrosion resistance than a pure Zn coating and could provide both anodic protection and physical barrier function in the NdFeB substrates. The Fe element in Zn–Fe alloy coating was predominantly in solid solution in η-phase and small amounts in elemental form, which was beneficial to acquire a compact coating and passivation film. Finally, the passivated Zn–Fe alloy coating withstood 210 h against a neutral 3.5 wt.% NaCl salt spray without any white rust, which was 3–4 times longer than the pure Zn coating.

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Section: Resultsmentioning

confidence: 99%