Electric surface field effect on the formation of nanoporous pipe structure in Al anodization process

알루미늄 양극산화 공정에서의 나노다공성 파이프 구조 형성에 대한 표면 전기장 효과

The authors investigated anomalous nanoporous structures of aluminum oxides during the Al anodization process. We implemented two-steps anodizing process for the electrolyte of oxalic acid. As increasing DC voltages, lattice constants are proportionally increased. For the curved surface, the surface electric field was distorted so that the nanoporous pipe channel changed to a cone-type shape. We confirmed the periodicity by using the FFT(Fast Fourier Transform) analysis.