Abstract
The effects the concentration of cobalt on zinc-cobalt alloys obtained from sulphate baths under continuous current deposition are described. The deposit morphology was analyzed using Scanning Electron Microscopy (SEM) and an X-Ray Diffraction (XRD) was used to determine the preferred crystallographic orientations of the deposits. Protection against corrosion properties studied in a solution of 3 % wt NaCl in the potentiodynamic polarization measurements (Tafel), electrochemical impedance spectroscopy (EIS) to the potential of corrosion free. The parameters that characterize the corrosion behavior can be determined from the plots and Nyquist plots. It has been observed that the Zn–Co alloy is characterized by enhanced the resistance of corrosion compared to the Zn alloys and the addition of Co in the Zn-Co increases the micro-hardness, XRD and SEM results an identify any coatings Zn-Co alloy composition reveals that. zinc - rich ( η- phase) , cubic Co5Zn21 .
Highlights
Considerable research has been performed to improve the corrosion resistance of metallic surfaces
3.2 Effect of Cobalt content of the bath on coatings micro hardness The variation of microhardness vs cobalt content in the deposited Zn–Co alloy coatings is shown in Fig. 2 and Table 3
This figure indicates that the micro hardness of Zn–Co alloy coatings increases with increasing cobalt content
Summary
Considerable research has been performed to improve the corrosion resistance of metallic surfaces. Cobalt and nickel have been incorporated in zinc plating baths to obtain coatings with higher corrosion resistance [1] At high cobalt content (more than 10 wt.%), Zn–Co multilayer coatings have better corrosion resistance than zinc-cobalt single layer coatings as reported by Bahrololoom et al [1].The electrodeposition of Zn–Co alloys with a controlled morphology and composition has been the subject of many studies as a consequence of their observed improved corrosion resistance [1 ,10-11]. The purpose of our work is the characterization of composites Zn-Co deposits on a mild steel substrate. These deposits are obtained using an acidic sulphate bath, which were introduced from the suspension Studies potentiodynamic polarization and electrochemical impedance in a solution of 3 % wt NaCl
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