Scientific Reports (Dec 2017)

Hydrothermal treatment and butylphosphonic acid derived self-assembled monolayers for improving the surface chemistry and corrosion resistance of AZ61 magnesium alloy

  • Chung-Wei Yang,
  • Cheng Liu,
  • Da-Jun Lin,
  • Ming-Long Yeh,
  • Tzer-Min Lee

DOI
https://doi.org/10.1038/s41598-017-17199-z
Journal volume & issue
Vol. 7, no. 1
pp. 1 – 13

Abstract

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Abstract The hydrothermal treatment followed by a self-assembled monolayer (SAM) of 1-butylphosphonic acid through the tethering by aggregation and growth (T-BAG) method was employed to produce protective surface coatings on the Mg-6Al-1Zn alloy (AZ61) for reducing the degradation rate in physiological environments. Potentiodynamic polarization measurements revealed that the organic self-assembled monolayer and Mg(OH)2 coating can further enhance the surface chemical stability and corrosion resistance of Mg alloys. SAM-treated Mg(OH)2 coatings can be served as a more passive surface layer as a result of their much higher charge transfer resistance and the presence of Warburg impedance in electrochemical impedance spectroscopy measurement.