Abstract
XPS spectra of Al (110) plane polarized in HCl solutions added aliphatic carboxylic acids and ATR IR spectra of film on Al specimen polarized in the same solutions were measured. The magnitudes of chemical shifts of the XPS spectra are proportional to both decrease in icorr and the magnitude of E, and the shifts are proportional to strengths of the carboxylic acids. The ATR IR spectra show that weak hydrous oxide films form on the Al surface and RCOO- is adsorbed on the surface. The Al2O3 film is made on the Al surface and H2O, RCOO- form a hydrogen bonding with the Al2O3 film, and this becomes the hydrous oxide films. The strength and holding of the films are the same as the degree of the decrease of icorr and the order of the strengths is CH2=CHCOO->HCOO->MeCOO->EtCOO-.
