Effect of diethanolamine and triethanolamine on the properties of electroplated Zn-Ni alloy coatings from acid bath

被引：14

作者：

Hammami, Olfa ^{[1
,2
]}

Dhouibi, Leila ^{[1
]}

Bercot, Patrice ^{[2
]}

Rezrazi, El Mustafa ^{[2
]}

Triki, Ezzeddine ^{[1
]}

机构：

[1] Univ Tunis El Manar, Unit Res COPROMET ENIT, Tunis 1002, Tunisia

[2] Univ Franche Comte, Equipe Sonochim & React Surfaces, CNRS UMR 6213, Inst UTINAM, F-25030 Besancon, France

来源：

CANADIAN JOURNAL OF CHEMICAL ENGINEERING | 2013年 / 91卷 / 01期

关键词：

Zn-Ni alloy; electrodeposition; ethanolamines; deposit morphology; phase structures; ELECTRODEPOSITION PROCESS; COMPLEXES;

D O I：

10.1002/cjce.21627

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

In the present work, zincnickel 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 ZnNi 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 ? and highly Zn-enriched phases. The presence of these additives resulted also in coatings with finer grains. The behaviour of modified ZnNi alloy coatings in corrosion solution of 3% NaCl was investigated through potentiodynamic polarisation and electrochemical impedance spectroscopy. It was found that the obtained ZnNi/3?mM TEA alloy exhibited better corrosion resistance compared to pure ZnNi alloy electrodeposited at similar conditions. (c) 2012 Canadian Society for Chemical Engineering

引用

页码：19 / 26

页数：8

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