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An efficient protection of stainless steel against corrosion: Combination of a conversion layer and titanium dioxide deposit

机译:有效地保护不锈钢免受腐蚀:转换层和二氧化钛沉积物的结合

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摘要

In the present work, a novel process has been developed to improve the corrosion properties of ferritic stainless steels. Titanium oxide coatings have been deposited onto stainless steel by sol–gel process after a pre-functionalization of the substrate in a conversion bath. Gel titania was prepared by hydrolysis of a titanium butoxide through a sol–gel process. Duplex systems "conversion layer/uniform TiO2 coating" have been prepared on stainless steels using a dipping technique and thermal post-treatments at 450 °C. The preparation of sol–gel coatings with specific chemical functions offers tailoring of their structure, texture and thickness and allows the fabrication of large coatings. The morphology and structure of the coatings were analysed using scanning electron microscopy with field effect gun (SEM-FEG), Mass spectroscopy of secondary ions (SIMS) and X-ray diffraction (XRD). The anticorrosion performances and the ageing effects of the coatings have been evaluated in neutral and aggressive media by using several normalized tests. The results show that the conversion layer was not sufficient to protect steel but sol–gel TiO2 coatings, anchored on the metal substrate via the conversion layer, show good adhesion with the substrate and act as a very efficient protective barrier against corrosion. So, duplex layers with TiO2 nanoparticle coatings on steels exhibit an excellent corrosion resistance due to a ceramic protective barrier on metal surface. Analysis of the data indicates that the films act as geometric blocking layers against exposure to the corrosive media and increase drastically the lifetime of the substrate.
机译:在当前的工作中,已经开发出一种新颖的方法来改善铁素体不锈钢的腐蚀性能。在转化池中对基材进行预功能化后,已通过溶胶-凝胶法将氧化钛涂层沉积在不锈钢上。凝胶二氧化钛是通过溶胶-凝胶工艺水解丁醇钛制备的。使用浸涂技术和450°C的热后处理技术,已经在不锈钢上制备了双相体系“转化层/均匀的TiO2涂层”。具有特定化学功能的溶胶-凝胶涂料的制备可调整其结构,质地和厚度,并允许制造大型涂料。使用具有场效应枪的扫描电子显微镜(SEM-FEG),二次离子质谱(SIMS)和X射线衍射(XRD)分析了涂层的形貌和结构。通过使用几种标准化测试,已在中性和腐蚀性介质中评估了涂层的防腐性能和老化效果。结果表明,转换层不足以保护钢,但通过转换层锚固在金属基材上的溶胶-凝胶TiO2涂层与基材之间显示出良好的粘合性,并且是非常有效的防腐蚀保护层。因此,由于金属表面上的陶瓷保护层,在钢上具有TiO2纳米颗粒涂层的双相层具有出色的耐腐蚀性。数据分析表明,这些膜充当了几何阻挡层,可防止其暴露于腐蚀性介质,并大大增加了基材的使用寿命。

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