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现行 ASTM D4366-16(2021)
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Standard Test Methods for Hardness of Organic Coatings by Pendulum Damping Tests 用摆锤阻尼试验测定有机涂层硬度的标准试验方法
发布日期: 2021-06-01
1.1 这些测试方法包括使用摆锤阻尼测试仪测定已应用于可接受平面刚性表面(如金属或玻璃板)的有机涂层的硬度。 1.2 以下介绍了基于不同摆锤类型的两种试验方法: 1.2.1 试验方法A-König摆锤硬度试验。 1.2.2 试验方法B-Persoz摆锤硬度试验。 1.3 本标准在内容上与ISO 1522相似(但在技术上不等同)。 1.4 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.5 本标准并非旨在解决与其使用相关的所有安全问题(如有)。本标准的用户有责任在使用前制定适当的安全、健康和环境实践,并确定监管限制的适用性。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒(TBT)委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 已发现摆锤阻尼试验在检测涂层硬度差异方面具有良好的灵敏度,其中硬度定义为抗变形性。 5.2 这些试验方法中给出的两个程序体现了一个原理,即接触表面的摆的振幅随着表面越软而下降越快。然而,这些试验方法在摆锤尺寸、振荡周期和振幅方面有所不同。 5.3 一般来说,König摆的阻尼时间约为Persoz摆的一半。 5.4 Persoz摆在测量软涂层硬度方面比König有更大的区分度,但由于其在摩擦系数较低的表面上容易打滑,因此可能不适合测试坚硬、光滑的薄膜。 5.5 摆锤和漆膜之间的相互作用是复杂的,取决于弹性和粘弹性,可能无法在两种摆锤测试之间建立精确关系。
1.1 These test methods cover the use of pendulum damping testers in the determination of hardness of organic coatings that have been applied to acceptably plane rigid surfaces, such as a metal or glass panel. 1.2 Two test methods based on different pendulum types are covered as follows: 1.2.1 Test Method A—König Pendulum Hardness Test. 1.2.2 Test Method B—Persoz Pendulum Hardness Test. 1.3 This standard is similar in content (but not technically equivalent) to ISO 1522. 1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 The pendulum damping test has been found to have good sensitivity in detecting differences in coating hardness, where hardness is defined as resistance to deformation. 5.2 The two procedures given in these test methods embody the principle that the amplitude of oscillation of a pendulum touching a surface decreases more rapidly the softer the surface. However, these test methods differ in respect to pendulum dimensions, and period and amplitude of oscillation. 5.3 In general, the damping time of the König pendulum is approximately half that of the Persoz pendulum. 5.4 The Persoz pendulum has a greater degree of discrimination than the König for measuring the hardness of soft coatings, but it may not be as suitable for testing hard, slippery films because of its tendency to skid on surfaces with a low coefficient of friction. 5.5 The interaction between the pendulum and the paint film is complex, depending on both elastic and viscoelastic properties, and it may not be possible to establish a precise relationship between the two types of pendulum tests.
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归口单位: D01.23
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