Corrosion Behavior of Mg(OH)2/Mg-Al Layered Double Hydroxides/AlO(OH) Composite Film Prepared by Steam Coating on Mg Alloy AZCa612

Kae Nakamura, Yuma Nagashima, Hiraku Muto, Ryo Nakano, Takahiro Ishizaki

研究成果: Article査読

抄録

This study investigated the corrosion behavior of the corrosion-resistant films steam coated on AZCa612 magnesium alloy. The film samples were corroded by immersing them in 5 wt% NaCl aqueous solution for a predetermined time. The corroded films were characterized using scanning electron microscopy, energy-dispersive X-ray spectroscopy, glancing angle X-ray diffraction, Fourier transform infrared spectroscopy, potentiodynamic polarization measurements, hydrogen generation measurements, and electrochemical impedance spectroscopy. The amount of Mg Al CO3 layered double hydroxides (LDHs) in the film slightly decreased from the beginning of immersion to 120 h after immersion and gradually increased thereafter. Mg Al Cl LDHs were formed after 6 h of immersion and rapidly grew as the immersion progressed. In addition, even with the gradual decrease in the corrosion resistance of the film, there was no major damage observed on the substrates. These results indicate that the corrosion protection mechanism varied with the immersion time. The corrosion-resistant property under a short immersion time could be attributed to the high corrosion resistance of Mg(OH)2 and AlO(OH), whereas it is attributed to the coverage provided by the Mg Al Cl and Mg Al CO3 LDHs under a longer immersion duration.

本文言語English
論文番号021508
ジャーナルJournal of the Electrochemical Society
169
2
DOI
出版ステータスPublished - 2022 2月 1

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 再生可能エネルギー、持続可能性、環境
  • 表面、皮膜および薄膜
  • 電気化学
  • 材料化学

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