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首页> 外文期刊>Applied Surface Science >On the combined use of scratch tests and CLA profilometry for the characterization of polyester powder coatings: Influence of scratch load and speed
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On the combined use of scratch tests and CLA profilometry for the characterization of polyester powder coatings: Influence of scratch load and speed

机译：结合使用划痕试验和CLA轮廓分析法来表征聚酯粉末涂料：划痕载荷和速度的影响

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摘要

The prediction of the mechanical properties of polyester powder coatings is of paramount importance, as they have to undergo a wide variety of forces and deformations during their service life. Determine the response of polymeric coatings to the actual loading conditions can be, however, very troublesome as their properties are function of the material physical state, rate-dependence and yield and break behaviour. Further, the characterization of soft, contaminated organic surfaces such as polymers can often cause severe problems with reliability and imaging accuracy due to instrumental artefacts. This is therefore the context in which this paper investigates the capability of multiple parameters scratch tests joined with non-contact CLA profilometry and FE-SEM to detect the scratch response of polyester powder coatings for protective and decorative outdoor applications. Scratch tests with blunt contact geometry were used to evaluate the response of polyester coatings baked at different time-temperature programs and, so, at different stages of their curing process. In particular, being such coatings highly non-linear in their response to mechanical stress or strain, the influence from scratch load and speed was carefully taken into account. Analytical evaluations of the experimental results led to good correlations between the extent of the deformed zone after scratch, scratch parameters and curing operational settings. This allows mapping the scratch response of the polyester topcoats to broad ranges of both scratch parameters and curing conditions.
机译：预测聚酯粉末涂料的机械性能至关重要，因为它们在使用寿命期间必须承受各种各样的力和变形。然而，确定聚合物涂层对实际加载条件的响应可能非常麻烦，因为它们的性质取决于材料的物理状态，速率依赖性以及屈服和断裂行为。此外，由于仪器的伪像，表征柔软，受污染的有机表面（例如聚合物）通常会在可靠性和成像精度方面引起严重问题。因此，在本文中，本文探讨了多参数刮擦测试与非接触式CLA轮廓测量和FE-SEM结合使用的能力，以检测用于保护性和装饰性户外应用的聚酯粉末涂料的刮擦响应。使用具有钝接触几何形状的划痕测试来评估在不同时间-温度程序下以及因此在其固化过程的不同阶段烘烤的聚酯涂层的响应。特别地，由于这种涂层对机械应力或应变的响应是高度非线性的，因此仔细考虑了刮擦载荷和速度的影响。实验结果的分析评估导致划痕后的变形区范围，划痕参数与固化操作设置之间具有良好的相关性。这允许将聚酯面漆的划痕响应映射到大范围的划痕参数和固化条件。

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