ABSTRACT Zinc (carboxylate) soaps, formed by reactions between zinc oxide (ZnO) and fatty acids in a drying oil, are known to cause deterioration in the paint layers of modern and contemporary oil paintings. This study investigates zinc carboxylates that developed in an oil painting test panel designed to mimic the aging and degradation encountered in actual works of art. Following accelerated and natural aging, protrusions were noted on the surface of the test panel. A large protrusion with erupted gel features was extracted from the test panel, mounted in top view, and then cut to reveal the sample's cross section. The gel features, which resulted from the unreacted oil binder's separation from the paint matrix, facilitated zinc carboxylate formation. Using reflectance µ-FTIR and SEM-EDX analysis, the morphologies and spatial distributions of zinc carboxylates within the gel regions of the protrusion were studied. A concentration gradient of zinc within the gel material was observed in the cross-sectional view, indicating patterns of zinc carboxylate formation and migration.

中文翻译：

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油漆测试板中羧酸锌的表征

摘要 锌（羧酸）皂是由氧化锌 (ZnO) 和干性油中的脂肪酸反应形成的，已知会导致现代和当代油画的油漆层变质。这项研究调查了在油画测试面板中开发的羧酸锌，该测试面板旨在模拟实际艺术品中遇到的老化和降解。经过加速和自然老化后，在测试面板的表面上发现了突起。从测试板上提取具有喷发凝胶特征的大突起，安装在顶视图中，然后切割以显示样品的横截面。由于未反应的油粘合剂与涂料基质分离而产生的凝胶特征促进了羧酸锌的形成。使用反射 µ-FTIR 和 SEM-EDX 分析，研究了突起凝胶区域内羧酸锌的形态和空间分布。在横截面图中观察到凝胶材料内锌的浓度梯度，表明羧酸锌形成和迁移的模式。