Corrosion resistance of phytic acid / Ce (III) nanocomposite coating with superhydrophobicity on magnesium

By Ou, Junfei; Chen, Xing
Published in Journal of Alloys and Compounds 2019

Abstract

By alternative immersion into the aqueous solutions of phytic acid (PA) and CeCl3 for n cycles, a nanocomposite coating coded as (PA/Ce)n was fabricated on the magnesium substrate. The Ce3+ ions were supposed to coordinate with the phosphate groups of the PA molecules and the (PA/Ce)n coatings adhered to the substrate firmly (5B according to the ASTM D 3359 method). Compared with the PA coating, the Ce3+ ions enhanced the corrosion resistance of the PA/Ce nanocomposite coating. To further improve the corrosion resistance, the (PA/Ce)n coatings were immersed into the ethanol solution of hexadecyltrimethoxysilane (HDMS) and followed by heating in air. The so-obtained sample coded as Mg-H2O-(PA/Ce)n-HDMS was superhydrophobic and possessed much better corrosion resistance as compared with the Mg-H2O-(PA/Ce)n sample due to the retained thin layer of air at the solid/water interface in the NaCl aqueous solution. For four cycles, the Mg-H2O-(PA/Ce)4-HDMS sample showed the most excellent superhydrophobicity with a contact angle of 167.3

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