論文
人工アルミニウムさび粒子の生成におよぼすアニオンの影響
2026 年 63 巻 9 号 p. 378-385
詳細
2026 年 63 巻 9 号 p. 378-385
To simulate the atmospheric corrosion of aluminum materials, artificial aluminum rust particles were synthesized by aging the solution containing AlCl3, Al(NO3)3 and Al2(SO4)3. Then, the molar ratio OH− ⁄ 3Al3+ of the solution was adjusted to 0–1.5. At OH− ⁄ 3Al3+ = 0, no precipitates were obtained from any solutions. At OH− ⁄ 3Al3+ = 0.25–0.75, NaAl3(SO4)2(OH)6 was mainly formed in Al(NO3)3-Al2(SO4)3, Al2(SO4)3-AlCl3 and AlCl3-Al(NO3)3-Al2(SO4)3 systems, while the particles were not yielded in AlCl3-Al(NO3)3 system. The γ-AlOOH particles were generated from each solution at OH− ⁄ 3Al3+ = 1.0. In case of OH− ⁄ 3Al3+ = 1.5, increasing amount of SO42− turned the major product following as Al(OH)3 → γ-AlOOH → no precipitate. These results indicate that formation and structure of aluminum rust particles depend on the anions and the effect is in the order of SO42− > Cl− ≈ NO3−. Consequently, SOx gas remarkably affects the rust formation in atmospheric corrosion of aluminum materials.
