期刊
ELECTROCHIMICA ACTA
卷 113, 期 -, 页码 229-239出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2013.09.136
关键词
Zinc electrodeposition; NTA alkaline solution; Voltammetry; X-ray diffraction; Scanning electron microscopy
资金
- FAPESP
- CNPq
- CAPES
An alkaline solution for the electrodeposition of Zn was developed, with trisodium nitrilotriacetic (NTA) as the complexing agent for Zn(II). The voltammetric studies showed that the NTA has a beneficial effect, displacing the initial reduction potential of Zn(II) species to more positive values than in its absence. Cyclic voltammetry of 1010 steel in alkaline Zn electrodeposition solution with 0.20 M NTA indicated the occurrence of the Zn underpotential electrodeposition, UPD, (regions wave c' and c '') and followed by Zn overpotential electrodeposition, OPD (region peak c'''). The Zn electrodeposit produced voltammetrically at limiting potential (E-f) -0.81 V (region wave c') was characterized by XRF and showed Zn presence. Zn electrodeposits produced potentiostatically at a potential -1.26V were characterized by means of SEM, EDS and XRD. SEM results showed that fine-grain and compact Zn electrodeposits were obtained in the presence of 0.20 M NTA, at an electrodeposition charge density (q(d)) of 10.0 C cm(-2). AFM analysis showed that the roughness of the Zn electrodeposits is greater in the presence than absence of 0.20 M NTA to both q(d) 2.0 and 10.0 C cm(-2). The adhesion test showed that the Zn electrodeposits, in general, had no area detached. The XRD pattern revealed that the Zn electrodeposits had a crystal structure with preferential orientation [0 0 2]. It was showed that NTA was a suitable complexing agent for the electrodeposition of Zn without dendrites and cracks. (C) 2013 Elsevier Ltd. All rights reserved.
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