TY - JOUR
T1 - Corrosion Behavior of Mg(OH)2/Mg-Al Layered Double Hydroxides/AlO(OH) Composite Film Prepared by Steam Coating on Mg Alloy AZCa612
AU - Nakamura, Kae
AU - Nagashima, Yuma
AU - Muto, Hiraku
AU - Nakano, Ryo
AU - Ishizaki, Takahiro
N1 - Funding Information:
The authors would like to acknowledge the financial support provided by the Grant-in-Aid for Scientific Research B (No. 19H02482) from the Japan Society for the Promotion of Science; Japan Science and Technology Agency (JST) under the Program on Open Innovation Platform with Enterprises, Research Institute and Academia (OPERA) (No. 18072116), and the Light Metal Educational Foundation, Inc..
Publisher Copyright:
© 2022 The Author(s).
PY - 2022/2/1
Y1 - 2022/2/1
N2 - 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.
AB - 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.
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U2 - 10.1149/1945-7111/ac54db
DO - 10.1149/1945-7111/ac54db
M3 - Article
AN - SCOPUS:85125731270
SN - 0013-4651
VL - 169
JO - Journal of the Electrochemical Society
JF - Journal of the Electrochemical Society
IS - 2
M1 - 021508
ER -