Formation of corrosion-resistance films on Al-Zn-Mg alloy by steam coating using acidic Zn(NO3)2 aqueous solutions

Tetsuya Yokomizo, Yuta Shimada, Mika Tsunakawa, Ai Serizawa, Takahiro Ishizaki

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Corrosion resistant films were fabricated on Al-Zn-Mg alloy by steam coating using Zn(NO3)2 aqueous solution at different concentrations. XRD patterns and FT-IR spectra demonstrated that nitrate type Zn-Al layered double hydroxide (LDH) and ZnO films were formed on the Al-Zn-Mg alloys by steam coating at the temperatures of 373 to 433 and 473 K, respectively, using Zn(NO3)2 aqueous solution at 1000 mM. γ-AlO(OH) films were found to be prepared on the Al-Zn-Mg alloys by steam coating at 513 K using Zn(NO3)2 aqueous solutions at the concentrations of 1 to 100 mM. The corrosion resistance of the films was investigated by potentiodynamic polarization curve measurements. The polarization curve measurements revealed that the γ-AlO(OH) films prepared by steam coating at 513 K using 1 mM of Zn(NO3)2 aqueous solution was most effective to suppress pitting corrosion and anodic current density.

Original languageEnglish
Pages (from-to)194-200
Number of pages7
JournalKeikinzoku/Journal of Japan Institute of Light Metals
Volume68
Issue number4
DOIs
Publication statusPublished - 2018 Jan 1

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Keywords

  • Al-Zn-Mg alloy
  • Corrosion resistance
  • Layered double hydroxide
  • Steam coating process

ASJC Scopus subject areas

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

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