Journal
CORROSION SCIENCE
Volume 202, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2022.110330
Keywords
Zn-Mg; Multilayer coating; Galvanized steel; Corrosion resistance; Corrosion product
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A novel Zn/Zn-Mg/Zn multilayer coating is prepared on steel plate, and the effect of Zn-Mg interlayer on corrosion resistance is discussed. The coating shows improved corrosion resistance due to the formation of a porous Mg corrosion product layer that permeates chloride ions and helps the coating transform into a protective phase.
A novel Zn/Zn-Mg/Zn multilayer coating is prepared on steel plate by PVD. The effect of the multilayer structure comprising Zn-Mg interlayer on the corrosion resistance is discussed. The corrosion resistance is evaluated by the salt spray test, and the corrosion progression is analyzed by electrochemical impedance spectroscopy and corrosion products observation. Eluted Mg ions from the Zn-Mg interlayer form a porous Mg corrosion product layer that permeates chlorine ions, assists the coating transform to Zn-5(OH)(8)Cl-2 center dot H2O phase. Improved corrosion resistance of the coating can be explained by the rapid increasement of the impedance by the formation of the protective Zn-5(OH)(8)Cl-2 center dot H2O phase.
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