Silanes and rare earth salts as chromate replacers for pre-treatments on galvanised steel
Silanes and rare earth salts as chromate replacers for pre-treatments on galvanised steel
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DOI：
10.1016/j.electacta.2004.01.051
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发表时间：
2004-07-30
影响因子：
6.6
通讯作者：
Simoes, AMP
中科院分区：
文献类型：
--
作者：
Ferreira, MGS;Duarte, RG;Simoes, AMP
基于Cr（VI）的预处理已经在几种材料上使用了很长一段时间，然而，它们受到了很大的批评，在不久的将来，它们可能会被明确禁止。当考虑一系列关键性能时，Cr（VI）的实际替代品显示出利弊，例如：耐腐蚀性、有机涂层的粘附性、耐疲劳性、可靠性和质量控制。然而，一些可能的替代品显示出很高的潜力，如果进行了一些改进，如果涉及的机制是更深入的understood.本工作的重点是使用稀土（Ce，La）盐和双硫硅烷（BTESPT）作为铬酸盐替代镀锌钢。这些化合物在通过浸渍和随后的固化施加时产生膜，其改善耐腐蚀性和油漆粘附性。薄膜的特征在于俄歇和XPS光谱。通过电化学阻抗谱和直流极化来评估耐腐蚀性。与铬酸盐转化预处理进行了比较，同时讨论了不同过程中可能的机理。(C)2004 Elsevier Ltd.保留所有权利。
Cr(VI)-based pre-treatments have been in use for long time on several materials, however, they are target of great criticism and in the near future they could be definitely banned. The actual alternatives to Cr(VI) show pros and cons when sets of key properties are considered such as: corrosion resistance, adhesion of organic coatings, fatigue resistance, reliability and quality control. However, some of the possible alternatives show high potential, if some improvements are carried out and the if mechanisms involved are more deeply understood.The present work focus on the use of rare earth (Ce, La) salts and bis-sulphur silane (BTESPT) as chromate substitutes for galvanised steel. These compounds when applied by immersion and subsequent curing originate films that improve corrosion resistance and paint adherence. The films were characterised by Auger and XPS spectroscopy. The corrosion resistance was assessed by electrochemical impedance spectroscopy and dc polarisation. Comparison with the chromate conversion pre-treatment is also carried out simultaneously with discussion of the possible mechanisms involved in the different processes. (C) 2004 Elsevier Ltd. All rights reserved.