Depth profiling of wrinkled coil coatings - new insights into gradient structures and coating degradation

IF 6.5 2区材料科学 Q1 CHEMISTRY, APPLIED

Progress in Organic Coatings Pub Date : 2025-04-24 DOI:10.1016/j.porgcoat.2025.109325

D. Leidlmair , J. Duchoslav , G. Mayr , H. Gsaller , B. Strauß , H. Groiss , D. Stifter

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引用次数: 0

Abstract

For the desired low-gloss appearance of applications such as outdoor roofing systems, organic coatings with a certain degree of surface corrugation are commonly used. Despite various mechanical and chemical mechanisms contributing to wrinkle formation in curing coatings have been extensively discussed in in the past, a comprehensive in-depth characterization of the internal microstructure of textured finishes is yet to be reported. In this work, the interior chemical structure of a state-of-the art wrinkled coil coating system consisting of a polyester-melamine topcoat and a polyester-polyurethane primer applied on a galvanized steel substrate was thoroughly examined by combining advanced surface analysis techniques with cryo-ultra-low-angle microtomy (cryo-ULAM). Plane-view depth-resolved analysis by means of focal-plane-array Fourier-transform infrared (FPA-FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS) mappings readily enabled to determine chemical gradients inside the topcoat layer related to the formation of a melamine-enriched and pigment-depleted skin on top of the coating system. Furthermore, correlative depth-resolved analysis additionally allowed to directly assess and compare the degradation of a high-end wrinkle coating system after accelerated artificial ageing as well as after exposure to atmospheric conditions, which consistently showed that the most significant alterations of the coating chemistry induced by progressive weathering particularly occurred at the melamine-enriched coating surface.

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起皱线圈涂层的深度轮廓分析——对梯度结构和涂层降解的新见解

对于室外屋顶系统等应用所需的低光泽外观，通常使用具有一定程度表面波纹的有机涂层。尽管过去已经广泛讨论了各种促进固化涂层起皱形成的机械和化学机制，但对纹理饰面内部微观结构的全面深入表征尚未有报道。在这项工作中，通过结合先进的表面分析技术和低温超低角显微切开术（cryo-ULAM），彻底检查了由聚酯-三聚氰胺面漆和聚酯-聚氨酯底漆组成的最先进的起皱卷材涂层系统的内部化学结构。通过焦平面阵列傅里叶变换红外（FPA-FTIR）光谱和x射线光电子能谱（XPS）映射的平面视图深度分辨分析，可以很容易地确定与涂层系统顶部三聚氰胺富集和色素耗尽皮肤形成相关的顶层涂层内的化学梯度。此外，相关的深度分辨分析还可以直接评估和比较高端褶皱涂层系统在加速人工老化和暴露于大气条件后的降解情况，结果一致表明，由渐进风化引起的涂层化学变化最显著，特别是发生在富含三聚氰胺的涂层表面。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Progress in Organic Coatings 工程技术-材料科学：膜

CiteScore

11.40

自引率

15.20%

发文量

577

审稿时长

48 days

期刊介绍： The aim of this international journal is to analyse and publicise the progress and current state of knowledge in the field of organic coatings and related materials. The Editors and the Editorial Board members will solicit both review and research papers from academic and industrial scientists who are actively engaged in research and development or, in the case of review papers, have extensive experience in the subject to be reviewed. Unsolicited manuscripts will be accepted if they meet the journal''s requirements. The journal publishes papers dealing with such subjects as: • Chemical, physical and technological properties of organic coatings and related materials • Problems and methods of preparation, manufacture and application of these materials • Performance, testing and analysis.