Sol-Gel법에 의한 Stainless Steel의 알루미나 코팅 = Alumina Coatings on Stainless Steel by the Sol-Gel Method

다국어 초록 (Multilingual Abstract)

The 304-stainless steel was coated with alumina by the sol-gel dipping method for improving its high temperature oxidation resistance. Effects of the preparative condition of clear alumina sols, the surface treatment of metals, and the addition of chemical additives on properties of clear sol-gels and coated films were investigated, and then the applicability of the sol-gel dipping method was examined.
The clear alumina sol for the effective coating could be prepared when adding 0.14 mole nitric acid as a peptization agent per 1 mole of Al-secbutoxide. The surface treatment by sand blasting and the addition of 0.14∼0.28cc glycerol per 20cc of the alumina sol were optimized to improve the spreading of sols on the metal surface and to minimize cracking in dried gels and films, respectively.
The stainless steel surface coated with alumina showed good oxidation resistance up to 1100℃, but spalling was observed over 1220℃ at which the single phase of α-alumina existed.