The foundational data and rules of SUS304 corrosion in aqueous lithium bromide solution at 150-200 8C have been investigated by means of weight loss in this paper. The Taguchi method was chosen to investigate the effects of variables on corrosion at higher temperature. Concentration of dissolved oxygen was controlled by keeping the vessel pressure at 1.3 kPa (absolute) before the experiment. The results showed that there was a transformation tendency from pitting corrosion to general corrosion and transition concentration of pitting and film corrosion decreased with increase in solution temperature. The adsorption, activity, and diffusivity of bromine ion led to different corrosion modalities.

A Fe/Cr doped SiO 2 thin film which can improve the anticorrosion characteristic of materials was prepared on SUS304 stainless steel substrates by a modified hydrothermal method which constitutes two parts of preparation process. The corrosion of stainless steel stimulated by aqueous Lithium bromide solution and the dissolution of silica from Na-Ca glass simultaneously. And then a Fe/Cr doped SiO 2 thin film is coated onto the substrate. The Fe/Cr doped SiO 2 film was characterised by scanning electronic micrographs, X-ray diffraction, X-ray photoelectron spectroscopy and Electron probe X-ray microanalyser. Results showed that the corrosion products M Xz , M(OH) xz (M: metal) and the silica reticular are combined to form a Fe/Cr doped SiO 2 thin film. Furthermore, a chemical bond formed between silicon reticular and metal ions to improve the compactness and the adhesive property of the film. The anticorrosion characteristics of the film were measured by the methods of weight loss and electrochemical potentiodynamic polarisation, indicating that the Fe/Cr doped SiO 2 thin film can improve the anticorrosion performance of stainless steels effectively.