Corrosion behavior of flame-resistant Calcium-added Magnesium alloy in NaCl aqueous solution containing various anion species

Mika Tsunakawa, Ryota Shiratori, Kae Nakamura, Takahiro Ishizaki

Research output: Contribution to conferencePaper

Abstract

Flame-resistant Ca-added Mg alloys are highly desirable as the materials for transport industry from viewpoints of the safety and lightweight. Recently, exposure tests of the Ca-added Mg alloys demonstrated that the anion species other than chloride ion, such as nitrate and sulfate ions, were present in the corrosion products formed on the Mg alloys. However, details of the corrosion behavior of the Ca-added Mg alloys have been not yet clarified. In this study, we aimed to investigate the corrosion behavior of the flame-resistant Ca-added Mg alloy in NaCl aqueous solution with and without sulfate ions by immersion testing. XRD and FT-IR measurements demonstrated that the corrosion products formed on the Ca-added Mg alloy AZX612 were composed of Mg(OH)2, MgCO3, and Mg-Al layered double hydroxide (LDH). Immersion tests in the corrosive solution revealed that the addition of SO42- to NaCl promoted the formation of the of Mg(OH)2. The dense layer of Mg(OH)2 served as an protective film towards corrosive NaCl solution, thus resulted in decreasing the corrosion rate of the flame-resistant Ca-added Mg alloy.

Original languageEnglish
Pages1559-1565
Number of pages7
Publication statusPublished - 2016 Jan 1
EventEuropean Corrosion Congress, EUROCORR 2016 - Montpellier, France
Duration: 2016 Sep 112016 Sep 15

Conference

ConferenceEuropean Corrosion Congress, EUROCORR 2016
CountryFrance
CityMontpellier
Period16/9/1116/9/15

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Keywords

  • "Calcium-added magnesium alloy"
  • "Corrosion test"
  • "Flame resistant"
  • "NaCl aqueous solution"
  • "Sulfate ion"

ASJC Scopus subject areas

  • Materials Science(all)
  • Industrial and Manufacturing Engineering
  • Surfaces and Interfaces
  • Colloid and Surface Chemistry

Cite this

Tsunakawa, M., Shiratori, R., Nakamura, K., & Ishizaki, T. (2016). Corrosion behavior of flame-resistant Calcium-added Magnesium alloy in NaCl aqueous solution containing various anion species. 1559-1565. Paper presented at European Corrosion Congress, EUROCORR 2016, Montpellier, France.