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首页> 外文期刊>Surface & Coatings Technology >The influence of heat treatment of inorganic conversion coatings produced by sol-gel dip coating on the anticorrosive properties of alumina films deposited on steel substrate - Part II: silica/boehmite or boehmite/silica multilayered conversion coatings
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The influence of heat treatment of inorganic conversion coatings produced by sol-gel dip coating on the anticorrosive properties of alumina films deposited on steel substrate - Part II: silica/boehmite or boehmite/silica multilayered conversion coatings

机译：溶胶浸涂生产的无机转化涂层的热处理对钢基底涂层氧化铝膜的抗腐蚀性的影响 - 第二部分：二氧化硅/勃姆石或勃姆石/二氧化硅多层转化涂层

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摘要

Following on the results presented in the first part of this study, the focus of attention now shifts to the influence of different deposition sequences and heat treatment temperatures on the production of multilayered conversion coatings of silica and boehmite on 1020 carbon steel, aiming the improvement of the anticorrosive performance of alumina coatings in a saline medium. Thus, conversion coatings composed by different deposition sequences of two xerogel films (boehmite/silica and silica/boehmite films), were evaluated by SEM and XRD after heat treatment. After covering these multilayered conversion coatings containing silica and boehmite with alumina film, the systems were characterized by electrochemical impedance spectroscopy in NaCl 0.5 mol L-1 solution. Both kinds of multilayered conversion coatings improved the anticorrosive performance of the alumina film in the aggressive medium, independent of the coating arrangement and the heat treatment temperature used. Moreover, this parameter affected the composition and morphology of both kinds of conversion coatings, directly influencing on the anticorrosive properties of the final coating systems. Among all of the systems studied in the present work, the one produced using silica/boehmite deposition sequence and heat-treated at 600 degrees C showed the most significant improvement in the corrosion protection of steel in a saline medium.
机译：在本研究的第一部分提出的结果之后，关注的焦点现在改变了不同沉积序列和热处理温度对1020碳钢的多层转化涂层的影响，旨在改善盐培养基中氧化铝涂层的防腐蚀性能。因此，通过SEM和XRD在热处理后通过SEM和XRD评估由两个Xerogel膜（Boehmite /二氧化硅和二氧化硅/勃姆石膜）的不同沉积序列组成的转化涂层。在覆盖含有二氧化硅和勃姆石的这些多层转化涂层用氧化铝膜，该系统的特征在于NaCl 0.5mol L-1溶液中的电化学阻抗谱。两种多层转化涂层改善了炭化介质中氧化铝膜的防腐蚀性能，与所使用的涂层布置和热处理温度无关。此外，该参数影响两种转化涂层的组成和形态，直接影响最终涂层系统的防腐性能。在本作本作研究中研究的所有系统中，使用二氧化硅/勃姆石沉积序列产生的系统和600℃的热处理显示出盐培养基中钢腐蚀保护的最显着提高。

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