The electrodeposition of siliceous film on aluminum was investigated in order to convert non-image areas to hydrophilic surface in short time after the formation of oleophilic image areas in the platemaking process of direct image aluminum lithographic plates. Siliceous films were electrodeposited on aluminum foils in various sodium silicate solutions (SiO
2/Na
2O molar ratio: 2.2, 2.5, 3.1). Applied voltages were 10, 30 and 50V. Water wettability and ink receptivity of the electrodeposited surface were examined and IR spectra and XPS spectra were measured. Ink did not adhere to the surface electrodeposited for 5 seconds. The formation of siliceous films was affected considerably by the applied voltages but not affected very much by electrodeposition time. Siliceous films were formed easily in the sodium silicate solutions that have high SiO
2/Na
2O ratio. It was found that the electrodeposition of siliceous film may be applied to the treatment to make non-image areas hydrophilic in platemaking process of direct image lithographic plates.
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