Fig. 1 SEM image of Mg-Al LDH electrodeposited AA6061.Fig. 1 (a) Molecular structures of R-CZL ((R)-isomer), rac-CZL (racemate). (b) Photo image of the gel based on R-CZL under 365 nm UV irradiation.89Poster Award NomineePoster Award NomineeP5-17Enhancing Corrosion Resistance by Electrodeposition of Mg-Al Layered Double Hydroxide (LDH) for AA6061 AlloySupicha Trakuldit1,2 and Sachiko Hiromoto2,11 Graduate School of Fundamental Science and Engineering, Waseda University2 Research Center for Structural Materials, National Institute for Materials Science (NIMS)Aluminum alloys are utilized in contact with other metals, such as steel, in practical use. It promotes the corrosion of aluminum alloys by galvanic couple behavior. Electrodeposition of Mg-Al layered double hydroxide (Mg-Al LDH) was employed on AA6061 aluminum alloy to enhance the corrosion resistance. The influence of varied electrolyze concentrations was examined to optimize the coating condition. After electrodeposition, Mg-Al LDH islands preferentially formed on intermetallic precipitates. In a bath containing 1 M of Mg(NO3)2 and Al(NO3)3 solutions (1 M-bath), the Mg-Al LDH coated AA6061 showed a higher coverage of LDH islands on precipitates. Polarization and impedance tests in 0.1 M NaCl revealed that Mg-Al LDH coated AA6061 performed the corrosion protection ability, and AA6061 treated in the 1 M-bath has higher corrosion resistance due to more coverage of LDH on precipitates. In the wet-dry test, some localized corrosions were observed around the Fe-rich precipitates in the as-polished AA6061, while no corrosions occurred on the LDH coated AA6061, indicating that the presence of Mg-Al LDH on precipitates improved corrosion resistance of AA6061. This study provides the optimization of corrosion-protective Mg-Al LDH electrodeposition for AA6061 alloy.[1] A. Ruiz-Garcia, V. Esquivel-Peña, J. Genesca, R. Montoya, Electrochimica Acta, 449, (2023). P5-18Supercooled π-Gels Based on A Chiral Alkylated–Carbazole LiquidAkito Tateyama1,2 and Takashi Nakanishi1,2, 1 Graduate School of Life Science, Hokkaido University2 Research Center for Materials Nanoarchitectonics, National Institute for Materials Science (NIMS)In recent years, solvent-free functional molecular liquids composed of a π-conjugated unit and branched alkyl chains (alkyl–π liquids) have attracted attention.[1] To expand the usefulness of alkyl–π liquids, it is necessary to adjust their elastic modulus over a wide range. Therefore, we developed optoelectronically-active gel materials (alkyl–π gels) based on alkyl–π liquids using low-molecular-weight gelators.[2] This study focuses on the effect of chirality on the thermal and rheological properties of alkyl–π liquids and alkyl–π gels. Carbazole derivatives possessing a racemic (rac-CZL) or an (R)-isomeric (R-CZL) alkyl chain (Fig. 1a) were utilized. The as-obtained R-CZL was a supercooled liquid at room temperature; in contrast, rac-CZL was a practically stable liquid. Furthermore, adding 1 wt % low-molecular-weight gelator to R-CZL formed supercooled gel stable at room temperature (Fig. 1b). The gel exhibited unique temperature-dependent rheological properties due to its supercooling behavior.[1] A. Tateyama, T. Nakanishi, Responsive Mater., 1, e20230001 (2023). [2] A. Tateyama, T. Nakanishi, et al., Angew. Chem. Int. Ed., 63, 202402874 (2024).
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