Investigations on composition and morphology of electrochemical conversion layer/titanium dioxide deposit on stainless steel

SURFACE & COATINGS TECHNOLOGY

卷:201

Article

Barnoulid, L. ; Benoit-Marquie, F. ; Aries, L. ; Guenbour, A. ; Ben Bachir, A. ; Maurette, M. -T. ; Ansart, F. ; El Hajjaji, S.

关键词: conversion coating;    sol-gel;    TiO2;    stainless steel;   

DOI  :  10.1016/j.surfcoat.2006.05.037

来源: Elsevier

【 摘 要 】

In this study, the formation and characterization of conversion coatings modified by a sol-gel TiO2 deposit were investigated as a way to develop a new photocatalyst for water and air depollution. The conversion coating, characterised by strong interfacial adhesion, high roughness and high surface area facilitates the sol-gel deposition of titania and enhances its adhesion to the substrate. The conversion treatment is carried out in an acid solution. Observation by Scanning Electron Microscopy (SEM) reveals a rough surface with pores and cavities. According to SIMS measurements, the thickness of the initial conversion layer is evaluated at about 1.5 mu m. On this pre-functionalised support, the titanium dioxide was deposited by the sol-gel method. The roughness measurements coupled with SIMS analysis allowed a precise evaluation of the surface state of the final layers. The coating consists of two layers: a TiO2 outer layer and an inner layer containing iron chromium oxides. Characterization by X-ray diffraction (XRD) showed the existence of the TiO2 anatase structure as the main compound. (c) 2006 Elsevier B.V. All rights reserved.

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