Electrolytic deposition and corrosion resistance of Zn-Ni coatings obtained from sulphate-chloride bath |
| |
Authors: | Katarzyna Wykpis Magdalena Popczyk Antoni Budniok |
| |
Affiliation: | (1) Surface Protection & Corrosion Control Lab, Central Metallurgical Research & Development Institute, CMRDI, P.O. 87, Helwan, Cairo, Egypt |
| |
Abstract: | Zn-Ni coatings were deposited under galvanostatic conditions on steel substrate (OH18N9). The influence of current density
of deposition on the surface morphology, chemical and phase composition was investigated. The corrosion resistance of Zn-Ni
coatings obtained at current density 10–25 mA cm−2 are measured, and are compared with that of metallic cadmium coating. Structural investigations were performed by the X-ray
diffraction (XRD) method. The surface morphology and chemical composition of deposited coatings were studied using a scanning
electron microscope (JEOL JSM-6480) with EDS attachment. Studies of electrochemical corrosion resistance were carried out
in the 5% NaCl, using potentiodynamic and electrochemical impedance spectroscopy (EIS) methods. On the ground of these research,
the possibility of deposition of Zn-Ni coatings contained 24–26% at. Ni was exhibited. It was stated, that surface morphology,
chemical and phase composition of these coatings are practically independent on current density of deposition. On the basis
of electrochemical investigations it was found that corrosion resistance of these Zn-Ni coatings is also independent of current
density. These coatings are more corrosion resistant in 5% NaCl solution than metallic cadmium. It was suggested that the
Zn-Ni coating may be used as a substitute for toxic cadmium. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|