Interfacial study of the formation mechanism of corrosion resistant strontium phosphate coatings upon Mg-3Al-4.3Ca-0.1Mn

Chong Ke, Ming Shi Song, Rong Chang Zeng, Yao Qiu, Yu Zhang, Rui Feng Zhang, Rui Liang Liu, Ivan Cole, Nick Birbilis, Xiao Bo Chen

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22 Citations (Scopus)

Abstract

Strontium phosphate (SrPO 4 ) conversion coatings with the ability to impart significant corrosion resistance were prepared upon magnesium alloy Mg-3Al-4.3Ca-0.1 Mn (wt.%). Scanning electron microscopy equipped with energy dispersive spectroscopy and transmission electron microscopy were also employed to characterise surface and interfacial morphology, along with the composition of the coatings. The protective performance of SrPO 4 coatings was examined by potentiodynamic polarisation curves and immersion testing. A coating-growth mechanism was proposed and correlations between processing parameters and coating quality was established. The findings herein provide new insights for design of environmentally-benign and corrosion resistant coatings upon magnesium alloys through a simple chemical conversion technique.

Original languageEnglish
Pages (from-to)143-153
Number of pages11
JournalCorrosion Science
Volume151
DOIs
Publication statusPublished - 1 May 2019

Keywords

  • A. Magnesium
  • B. SEM
  • B. TEM
  • C. Interfaces
  • C. Passive film

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