2015•Journal of Shaanxi University of TechnologyRequires access
Microstructure and corrosion resistance of hot dip Zn-Al-Mg and Zn-Al-Mg-Si alloy coatings
Liu Ji-tu
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Abstract
The microstructure and the corrosion resistance of hot dip Zn-0. 5Al-1. 5Mg,Zn-2Al-1. 5Mg and Zn-2Al-1. 5Mg-0. 3Si alloy coatings were comparatively investigated. The composition phases and the microstructures of coatings were analyzed by X-ray diffractometer,scanning electron microscope and energy dispersive spectrometer. The corrosion resistance of coatings was characterized by full immersion corrosion and neutral salt spray test. The results indicate that the Zn-Al-Mg and Zn-Al-Mg-Si alloy coatings are mainly composed of Zn phase,Al phase and Mg Zn2 phase,the Zn + Mg Zn2 eutectic and Zn + Al + Mg Zn2 eutectic were found in alloy coatings,the element of Al and Si can refine the grain size,adding Si in the Zn-Al-Mg alloy bath can enhance alloy coatings' resistance to corrosion.