Preparation of corrosion resistant film on Mg-6Al-1Zn-2Ca alloy by steam coating

Mika Tsunakawa, Yuta Shimada, Tomohiro Miyashita, Hoonseung Lee, Kae Nakamura, Ai Serizawa, Takahiro Ishizaki

Research output: Contribution to journalArticle

Abstract

Corrosion resistant films were prepared on flame-resistant Mg-6Al-1Zn-2Ca (in mass%) alloy by steam coating using ultra pure water as steam source. The prepared films were characterized using SEM, XRD, and FT-IR. Corrosion resistance of the film was estimated by polarization curve measurement in 5 mass% NaCl aqueous solution. All XRD patterns of the films coated Mg-6Al-1Zn-2Ca alloy revealed that all films were composed of crystalline Mg(OH)2 and Mg-Al layered double hydroxide (LDH). FT-IR spectra showed that the Mg-Al LDH had carbonate- and nitrate-ions in the interlayer. Potentiodynamic polarization curves of the film prepared at 433 K for 6 h indicated that the corrosion current density decreased by more than four orders of magnitude as compared to that of the uncoated Mg-6Al-1Zn-2Ca alloy.

Original languageEnglish
Pages (from-to)511-517
Number of pages7
JournalKeikinzoku/Journal of Japan Institute of Light Metals
Volume67
Issue number10
DOIs
Publication statusPublished - 2017 Jan 1

Keywords

  • Corrosion resistance
  • Flame-resistant Ca-added magnesium alloy
  • Magnesium hydroxide
  • Steam coating

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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