| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface treatment method for combining a galvanizing treatment or electrical zincing treatment with the surface treatment by a sol-gel method to synergetically demonstrate advantages of both treatment, easily controlling a sol solution, and imparting high weatherability to steel with low treatment cost, and to provide highly weatherable steel treated thereby. SOLUTION: In the surface treatment method, a ceramic coating layer formed of oxides of Si, Al or Ti by the sol-gel method is formed on a galvanized layer after the galvanized layer is formed on the steel surface, alkoxide of Si, Al or Ti is a starting material, and the starting material is stirred while adding water and an aqueous solution of an alkaline catalyst. The sol solution in the alkaline range of≥pH9 is prepared, the sol solution is deposited on the steel surface for gelatinization, and dried to form the ceramic coating layer. COPYRIGHT: (C)2006,JPO&NCIPI
|
