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Effect of diethanolamine and triethanolamine on the properties of electroplated Zn–Ni alloy coatings from acid bath
Author(s) -
Hammami Olfa,
Dhouibi Leila,
Berçot Patrice,
Rezrazi El Mustafa,
Triki Ezzeddine
Publication year - 2013
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.21627
Subject(s) - triethanolamine , diethanolamine , ethanolamines , alloy , corrosion , materials science , metallurgy , electroplating , dielectric spectroscopy , zinc , electrochemistry , nickel , nuclear chemistry , inorganic chemistry , chemical engineering , chemistry , ethanolamine , analytical chemistry (journal) , composite material , organic chemistry , electrode , layer (electronics) , engineering
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