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The effect of heat treatment of TiO2 coatings obtained by the sol-gel method on the corrosion resistance of chromium steel

Szałkowska E., Masalski J., Kucharska B., Głuszek J.

Materials Science Poland

2005

Vol. 23, No. 1

137--146

The corrosion resistance of chromium steel without coating and with a four-layer one-component TiO2 coating has been examined in acidic sulphatic solution at pH 3.0 and the temperature of 25?0.2 °C. TiO2 coatings were obtained by the sol-gel method. Ti(C3H7O)4 (tetraisopropyl orthotitanate) was used as the titanium precursor. Chromium steel was coated with the dip coating method. The structure and phase composition of the TiO2 coatings were determined from X-ray diffraction data. The topography of TiO2 coatings before and after corrosion tests was examined by scanning electron microscopy. The protective effect of onecomponent coatings was evaluated based on polarization curves. The heat-treating of the coatings influences their protective properties. In the solution examined, the best protective properties exhibited TiO2 coating (4 layers) heat-treated at 500 °C for 10 minutes.

The effect of sequence of sol-gel multilayer coatings deposition on corrosion behaviour of stainless steel 316L

Chęcmanowski J. G., Głuszek J., Masalski J.

Materials Science

2003

Vol. 21, No. 4

387-396

The possibility of producing protective coatings by the sol-gel process is discussed. Metaloorganic complexes open new possibilities for the syntheses of ceramic materials. The most important applications of Si alkoxides for the synthesis of inorganic-inorganic composites are presented. The SiO2 protective coatings on surgical stainless steel 316L have been synthesized by the sol-gel techniques. The multi-layer coatings were deposited by the dip method using sols containing appropriate molar ratios of the prekursor (tetraethoxysilan), anhydrous ethanol, nitric acid and acetic acid. Nanosilica with the surfactant didodecyldimethyl- ammonium bromide were added to the sols applied. Coatings were annealed from 200 st.C to 300 st.C. The electrochemical characterization by dc measurements of the protective coatings in Ringer's solutions is reported. The coatings performance has been compared using polarization characteristics. Two arbitrarily chosen values were taken: the current density at -750 mV and the potential corresponding to the current density of 2 A/cm2. The coatings were chosen and ranked with regard to additional parameters: the polarization resistance and the through-coating porosity. It has been established that the way of applying of the coatings had an influence on the protective properties. The best protective properties have the coatings obtained from sols consisting of three SiO2 layers with nanosilica and three SiO2 layers without nanosilica. The positive effect of nanosilica on the protective properties of the coatings was determinated. Small changes in the preparation process can often have disproportionate large effects on the quality of the coatings.

Electrochemical evaluation of protective properties of one-component SiO2 and TiO2 coatings obtained by the sol-gel method

Szałkowska E., Masalski J., Głuszek J.

Materials Science

2003

Vol. 21, No. 4

367-376

The paper presents the corrosion resistance of uncoated steel and steel coated with one-component films in 0.5 M H2SO4 at 22.0 0.2 °C. One-component coatings were obtained by the sol-gel method. The coatings were obtained by the dip coating method. Quantitative composition of the coatings and their thickness were estimated by means of X-ray Photoelectron Spectroscopy (XPS). The corrosion behaviour of steel coated with one-component films was evaluated with the use of electrochemical direct and alternating current methods.