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首页> 外文会议>Eurocorr 2004 >The early corrosion behaviour of galvanised steel pre-treated with bisfunctionalsilanes
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The early corrosion behaviour of galvanised steel pre-treated with bisfunctionalsilanes

机译：双官能硅烷预处理的镀锌钢的早期腐蚀行为

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Metal pre-treatments are essential to ensure long-term durability of pre-painted galvanisedsteel (coil coating). The pre-treatment must provide corrosion protection of the substrate andimproved adhesion of the organic coatings. Silane-based pre-treatments show high potentialin this field, if some improvements are carried out and if the mechanisms involved are moredeeply understood. Recent literature is mainly concerned with the evaluation of theparameters influencing the formation of effective films and their corrosion protection ranking.Although the importance of these studies, there is an important lack of information in whatconcerns the changes observed on the electrochemical and analytical response of the filmsduring their early stages of corrosion-induced deterioration. Thus, the aim of this work is toassess the electrochemical behaviour and the chemical composition of organosilane filmsformed on hot dip galvanized steel during immersion in NaCl solutions. Electrochemicalimpedance spectroscopy was used to assess the corrosion behaviour of the pre-treatedsubstrates and X-Ray photoelectron spectroscopy was used for the analytical characterisationof the films. The results show that the pre-treatment provides temporary corrosion protectionof the substrate. Moreover, the results evidence changes in the composition of the silane filmsduring exposure to the aggressive solutions. The work also discusses the early deterioration ofthe silane film.
机译：金属预处理对于确保彩涂镀锌钢（卷材涂层）的长期耐久性至关重要。预处理必须为基材提供腐蚀保护并改善有机涂层的附着力。如果进行了一些改进并且对所涉及的机理有了更深入的了解，基于硅烷的预处理在该领域显示出很高的潜力。近年来的文献主要是关于影响有效膜的形成及其腐蚀防护等级的参数的评估。尽管这些研究很重要，但是在有关膜在电化学和分析过程中观察到的变化方面，仍然缺乏足够的信息。腐蚀引起的劣化的早期阶段。因此，这项工作的目的是评估在浸入NaCl溶液期间在热浸镀锌钢板上形成的有机硅烷膜的电化学行为和化学组成。电化学阻抗光谱法用于评估预处理基材的腐蚀行为，X射线光电子光谱法用于薄膜的分析表征。结果表明，预处理为基材提供了暂时的腐蚀防护。而且，结果表明在暴露于侵蚀性溶液期间硅烷膜的组成发生了变化。该工作还讨论了硅烷膜的早期劣化。

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