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

• Autorzy: Chęcmanowski J. G. , Głuszek J. , Masalski J.
• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

sol-gel; nanosilica; potentiodynamic curves; surfactant; wet corrosion

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Materials Science
• Rocznik: 2003
• Tom: Vol. 21, No. 4
• Strony: 387--396
• Opis fizyczny: Bibliogr. 19 poz.,

Twórcy

autor

Chęcmanowski J. G.

• Institute of Inorganic Technology and Mineral Fertilizers, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław

autor

Głuszek J.

• Institute of Inorganic Technology and Mineral Fertilizers, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław

autor

Masalski J.

• Institute of Inorganic Technology and Mineral Fertilizers, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław

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