Abstract
Zn-Cu alloy was deposited onto AZ63 substrate, and the corrosion behaviour of resulting modified electrodes was investigated in 3 wt % NaCl solution in comparison with uncoated AZ63. Electrochemical, structural, and morphological study of the coating is presented. SEM images reveal that the surface morphology of the films is uniformly small spherical grain distributions. The XRD patterns illustrate polycrystalline structure and the formation of peaks corresponding to hexagonal close-packed ε-phase of Zn-Cu with various crystallographic orientations. Cyclic voltammetry was used to determine the potential ranges where the various redox processes occur. Linear sweep voltammetry results illustrate that longer exposure of uncoated AZ63 in NaCl solution produces a greater corrosion potential shift because of the formation of an oxide layer that did not prevent the progression of corrosion attack. The corrosion resistivity of Zn-Cu coated AZ63 is approximately two orders of magnitude greater than that of uncoated AZ63.
Highlights
The consumption of magnesium as a non-ferrous alkaline earth metal has been used for transportation, agriculture, chemical, construction, and energy industries, and even in medical applications thanks to its impressive properties, such as castability, weldability, good machinability, rigidity, toughness, and lightness [1]
1 shows typical X-ray diffraction patterns of Zn-Cu deposition on AZ63 substrate obtained from a solution of copper and zinc salts in potentiostatic process
According to microstructural analysis of the films, the surface of coated AZ63 alloy consists of uniformly distributed spherical grains between 0.5 μm and 2 μm in diameter
Summary
The consumption of magnesium as a non-ferrous alkaline earth metal has been used for transportation (aerospace, automobile), agriculture, chemical, construction, and energy industries, and even in medical applications thanks to its impressive properties, such as castability, weldability, good machinability, rigidity, toughness, and lightness [1]. In comparison with other materials used, the density of magnesium (1.74 g/cm3 ) provides an advantage, as it is 35% lighter than aluminium and four times lighter than steel. Mg and Mg-based alloys suffer from a high corrosion rate (typically greater than 3 mm/year) [3]. As Mg-based alloys have wide range of probable applications, a good joining process of Mg and Mg-based alloys is required to combine dissimilar materials. The welding interface does not have different materials than the joining components [4]. Mechanical and microstructural properties of the welding joints of Mg alloys have been widely studied [5], their corrosion problems have not been overcome. Chloride-including media, cause a high corrosion rate of magnesium-based alloys [6,8]. The motivation of this paper is to deposit a well-known coating (brass) onto a Mg-based alloy, and to study its corrosion resistivity compared to a Mg-based alloy in
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