Characterization and Corrosion Protection Properties of Electrodeposited Zn–Ni–Mn Coatings

Metal structures degrade significantly due to corrosion during their different uses, where significant amounts of aggressive ions are present. Therefore, anodic metals such as Ni, Mn, and Zn are used as protective agents. In this work, uniform, adherent and corrosion-resistant Zn–Ni–Mn coatings have...

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Bibliographic Details
Published in:	Protection of metals and physical chemistry of surfaces Vol. 59; no. 4; pp. 704 - 716
Main Authors:	Aouissi, Lamaa, Moumeni, Hayet, Boutasta, Amel, Nemamcha, Abderrafik, Mansouri, Hela, Mellah, Besma
Format:	Journal Article
Language:	English
Published:	Moscow Pleiades Publishing 01-08-2023 Springer Nature B.V
Subjects:	Anodic protection Characterization and Evaluation of Materials Chemistry and Materials Science Coatings Codeposition Copper Corrosion and Coatings Corrosion prevention Corrosion resistance Electrochemical impedance spectroscopy Electrodeposition Industrial Chemistry/Chemical Engineering Inorganic Chemistry Investigations Linear polarization Manganese ions Materials Materials Science Metallic Materials New Substances Nickel Nucleation Protective coatings Room temperature Substrates Tribology Zinc compounds nucleation morphology Scharifker and Hills electrodeposition Zn–Ni–Mn coatings corrosion resistance EIS structure
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Summary:	Metal structures degrade significantly due to corrosion during their different uses, where significant amounts of aggressive ions are present. Therefore, anodic metals such as Ni, Mn, and Zn are used as protective agents. In this work, uniform, adherent and corrosion-resistant Zn–Ni–Mn coatings have been prepared by electrodeposition on a Cu substrate from a sulfate bath at room temperature. The effect of Mn 2+ ions concentration, [Mn 2+ ], in the bath on the as-prepared samples has been investigated. The nucleation process influenced by the [Mn 2+ ] and applied deposition potentials, E, has been investigated according to the typical nucleation model of Scharifker and Hills (S–H). The analysis results show that both [Mn 2+ ] and E have a significant impact on the nucleation mode of Zn–Ni–Mn coatings. The EDX analysis shows that the codeposition behavior can be described as anomalous with Zn as the major element. The SEM analyses indicate that the electrodeposited coatings exhibit a compact and dense morphology with good uniformity, no cracks, and pyramidal-shaped particles with the particle’s size is Mn content dependent. The XRD investigation shows the coexistence of η-Zn and NiZn 3 phases known to contribute in improving the corrosion resistance of Zn–Ni–Mn coatings. Linear polarization plots and electrochemical impedance spectroscopy (EIS) techniques indicate that the optimal sample (Zn 55.7 –Ni 37.7 –Mn 1.6 ) presents a high corrosion resistance. This is due, according to the XRD and SEM results to the formation of a protective layer during the corrosion process composed of Zn 5 (OH) 8 Cl 2 and ZnMn 2 O 4 phases which prevents the progression of corrosion.
ISSN:	2070-2051 2070-206X
DOI:	10.1134/S2070205123700612