Preparation of Protective Multilayer SiO2 and Al2O3 Coatings on Austenitic Stainless Steel by Sol-Gel Method

Asahi Kawashima, Ying Wang, Eiji Akiyama, Hiroki Habazaki, Katsuhiko Asami, Koji Hashimoto

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

A method of forming continuous silica and alumina coating films using a sol-gel dip coating and a protectiveness of the coating films are presented. The protectiveness which is related to the defects in the coatings is evaluated by electrochemical methods including polarization curve and open circuit potential measurements in deaerated 0.5M H2SO4 at 303K. The transparent, continuous and adhesive sol-gel silica coating films are obtained when the coatings are applied to single layer alumina-coated Type 316 stainless steel substrate, while the films directly coated onto the mechanically polished substrate tends to produce some defects. The appearance and protectiveness depend on the withdrawal speed and the baking temperature. For instance, the most suitable withdrawal speed and baking temperature are 1.07 and 1.80×10-3m/s, and 673K, respectively. The high protective coating can be obtained by two-layer silica-coatings due to reduction of the defect densities in underlying coatings.

Original languageEnglish
Pages (from-to)654-659
Number of pages6
JournalZairyo-to-Kankyo
Volume43
Issue number11
DOIs
Publication statusPublished - 1994

Keywords

  • SiO and AlO films
  • corrosion protection
  • sol-gel method

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrochemistry
  • Materials Chemistry

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