In-Situ Characterization of the Mechancial Behavior of Hot-Dip Zn-5al Coating: An Overview of Deformation and Damage Mechanisms
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Zinc-based coatings are used in diverse applications mainly for their high resistance to corrosion and other properties such as good longevity. Previous research has focused mainly on microstructure and corrosion resistance of these coatings. However, mechanical properties are seldom mentioned in literature. Only a few studies have investigated mechanical behavior of zinc-based coatings, especially those exhibiting complex microstructures after addition of elements. This work focused on a Zn-5Al coating deposited on steel by continuous hot-dip galvanizing, giving a detailed overview of its microstructure and its crystallographic texture. Interesting deformation and damage mechanisms were revealed through in-situ tensile experiments coupled with digital image correlation measurements. Crack distribution and chronology of deformation and damage events were determined and well understood. In this experimental work, diverse techniques ranging from microstructure analysis with SEM and EBSD to the study of the mechanical behavior using micro-mechanical tensile testing, in-situ SEM observations and DIC measurements as well as advanced techniques such as focused ion beam for more in-depth studies were considered. The purpose of this work is to give a better understanding of deformation and damage mechanisms of zinc-based coatings.
Abstract
Zinc-based coatings are used in diverse applications mainly for their high resistance to corrosion and other properties such as good longevity. Previous research has focused mainly on microstructure and corrosion resistance of these coatings. However, mechanical properties are seldom mentioned in literature. Only a few studies have investigated mechanical behavior of zinc-based coatings, especially those exhibiting complex microstructures after addition of elements. This work focused on a Zn-5Al coating deposited on steel by continuous hot-dip galvanizing, giving a detailed overview of its microstructure and its crystallographic texture. Interesting deformation and damage mechanisms were revealed through in-situ tensile experiments coupled with digital image correlation measurements. Crack distribution and chronology of deformation and damage events were determined and well understood. In this experimental work, diverse techniques ranging from microstructure analysis with SEM and EBSD to the study of the mechanical behavior using micro-mechanical tensile testing, in-situ SEM observations and DIC measurements as well as advanced techniques such as focused ion beam for more in-depth studies were considered. The purpose of this work is to give a better understanding of deformation and damage mechanisms of zinc-based coatings.