Effect of diethanolamine and triethanolamine on the properties of electroplated Zn–Ni alloy coatings from acid bath
Identifieur interne : 000162 ( Main/Exploration ); précédent : 000161; suivant : 000163Effect of diethanolamine and triethanolamine on the properties of electroplated Zn–Ni alloy coatings from acid bath
Auteurs : Olfa Hammami [Tunisie, France] ; Leila Dhouibi [Tunisie] ; Patrice Berçot [France] ; El Mustafa Rezrazi [France] ; Ezzeddine Triki [Tunisie]Source :
- The Canadian Journal of Chemical Engineering [ 0008-4034 ] ; 2013-01.
English descriptors
Abstract
In the present work, zinc–nickel alloy coatings have been produced under direct current conditions from an acid bath with different concentrations of diethanolamine (DEA) and triethanolamine (TEA). The produced coatings were analysed through chronopotentiometry, microhardness, X‐ray diffraction and MEB techniques. The compositional analysis of the films showed that the Zn–Ni electrodeposition is anomalous for all the systems. Ethanolamines augmented the anomalous behaviour. The hindering in the Ni (II) reduction will be more effective due to complexation of Ni (II) catalyst with ethanolamines. Electrochemical and structure analysis of deposits indicated the presence of γ and highly Zn‐enriched phases. The presence of these additives resulted also in coatings with finer grains. The behaviour of modified Zn–Ni alloy coatings in corrosion solution of 3% NaCl was investigated through potentiodynamic polarisation and electrochemical impedance spectroscopy. It was found that the obtained Zn–Ni/3 mM TEA alloy exhibited better corrosion resistance compared to pure Zn–Ni alloy electrodeposited at similar conditions. © 2012 Canadian Society for Chemical Engineering
Url:
DOI: 10.1002/cjce.21627
Affiliations:
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