TY - JOUR
T1 - Formation of anticorrosive film for suppressing pitting corrosion on Al-Mg-Si alloy by steam coating
AU - Serizawa, Ai
AU - Oda, Takuhiro
AU - Watanabe, Kohei
AU - Mori, Kotaro
AU - Yokomizo, Tetsuya
AU - Ishizaki, Takahiro
N1 - Funding Information:
Acknowledgments: This research was supported by the Japan Science and Technology Agency (JST) under Industry-Academia Collaborative R&D Program “Heterogeneous Structure Control: Towards Innovative Development of Metallic Structural Materials” (No. 20100120), a Grant-in-Aid for Young Scientists (B) (No. 15K18237) from the Japan Society for the Promotion of Science and Research grant program for younger professors from JGC-S SCHOLARSHIP FOUNDATION (No. 1622).
Publisher Copyright:
© 2018 by the authors.
PY - 2018/1/1
Y1 - 2018/1/1
N2 - Al alloys offer excellent physical and mechanical properties, such as a low density, high specific strength, and good ductility. However, their low corrosion resistance has restricted their application in corrosive environments. There is a need, therefore, for a novel coating technology that is capable of improving the corrosion resistance of Al alloys. In the present study, we examined a steam-based method of forming a corrosion-resistant film on Al alloys. Al-Mg-Si alloy was used as the substrate. The cleaned substrates were set in an autoclave with ultrapure water as the steam source and processed using different temperatures and holding times, resulting in the formation of anticorrosive films on the alloy. FE-SEM images of the film surfaces showed that plate-like nanocrystals were densely formed over the entire surface. XRD patterns indicated that the film was composed mainly of AlOOH crystals. The potentiodynamic polarization curves revealed that the corrosion current density of the film-coated substrates significantly decreased, and that the pitting corrosion was completely suppressed, indicating that the corrosion resistance of the Al-Mg-Si alloy was improved by the film formed by means of steam coating.
AB - Al alloys offer excellent physical and mechanical properties, such as a low density, high specific strength, and good ductility. However, their low corrosion resistance has restricted their application in corrosive environments. There is a need, therefore, for a novel coating technology that is capable of improving the corrosion resistance of Al alloys. In the present study, we examined a steam-based method of forming a corrosion-resistant film on Al alloys. Al-Mg-Si alloy was used as the substrate. The cleaned substrates were set in an autoclave with ultrapure water as the steam source and processed using different temperatures and holding times, resulting in the formation of anticorrosive films on the alloy. FE-SEM images of the film surfaces showed that plate-like nanocrystals were densely formed over the entire surface. XRD patterns indicated that the film was composed mainly of AlOOH crystals. The potentiodynamic polarization curves revealed that the corrosion current density of the film-coated substrates significantly decreased, and that the pitting corrosion was completely suppressed, indicating that the corrosion resistance of the Al-Mg-Si alloy was improved by the film formed by means of steam coating.
KW - Aluminum alloy
KW - Corrosion resistance
KW - Pitting corrosion
KW - Potentiodynamic polarization
KW - Steam coating
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U2 - 10.3390/coatings8010023
DO - 10.3390/coatings8010023
M3 - Article
AN - SCOPUS:85051512280
SN - 2079-6412
VL - 8
JO - Coatings
JF - Coatings
IS - 1
M1 - 23
ER -