1.1 本试验方法涵盖了评估涂层系统从金属基材上的剥离强度（通常称为附着力）的程序。试验方法中描述了混凝土涂层的剥离强度 D7234 .本测试提供两个测试协议。方案1（断裂试验）确定了在分离材料塞之前，表面区域可以承受的最大垂直力（张力）。方案2（通过/失败）确定涂层表面是否在规定的载荷标准下保持完整。断裂将沿着由测试夹具、胶水、涂层系统和基材组成的系统内最薄弱的平面发生，并通过断裂面暴露。与其他方法（如划痕或刀片粘附）施加的剪切应力相比，本试验方法最大化了拉伸应力，结果可能不具有可比性。 注1: 本标准中的程序适用于金属基材，但也适用于其他刚性基材，如塑料和木材。用户/说明符必须解决基板的负载率和灵活性等因素。 注2: 本标准中的程序适用于平面。结果可能具有更大的可变性，而非平坦表面的值和平均值较低。 1.2 拉脱强度测量取决于材料、仪器和测试参数。通过每种试验方法获得的结果可能会得出不同的结果。应仅对每种试验方法的结果进行评估，不得与其他仪器进行比较。有五种仪器类型，被确定为测试方法B-F。必须确定报告结果时使用的测试方法。 注3: 本标准先前版本中出现的方法A已被取消，因为其主要用途是在混凝土基材上进行试验（见试验方法 D7234 ). 1.3 本试验方法描述了一类称为便携式拉脱附着力测试仪的仪器。 2. 它们能够向单个表面施加同心载荷和反向载荷，以便即使只有一侧可接近，也可以对涂层进行测试。测量受到加载夹具和试样表面之间的粘接强度或胶水、涂层和基材的内聚强度的限制。 1.4 该测试可能具有破坏性，可能需要进行局部维修。 1.5 以国际单位制或英寸-磅单位表示的数值应单独视为标准值。每个系统中规定的值不一定是精确的等价物； 因此，为确保符合本标准，每个系统应独立使用，且两个系统的值不得组合。 1.6 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。 1.7 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====== 4.1 涂层的拉脱强度是一种性能特性，可在规范中引用。本试验方法可作为均匀制备和测试涂层表面以及评估和报告结果的手段。本试验方法适用于满足本标准中确定涂层拉脱强度要求的任何便携式设备（见 附件A1– 附件A5 ). 4.2 当测试的任何参数改变时，相同涂层的结果可能会发生变化。这包括胶水、负载夹具尺寸、基材涂层固化时间、拉伸速率、环境条件（如果涂层有划痕）的变化，或使用不同的设备。因此，当一系列结果相互比较或用于统计分析时，仪器类型、基板、测试程序、胶水类型，以及是否使用评分，应与所考虑的拉力相同。 4. 建议相关方共同商定这些参数和试验期间允许的环境条件。 4.3 买方或指定方应指定具体的测试方法程序；B、 C、D、E或F和测试协议；1或2。如果未指定协议或通过/失败标准，则应使用协议1。

1.1 This test method covers a procedure for evaluating the pull-off strength (commonly referred to as adhesion) of a coating system from metal substrates. Pull-off strength of coatings from concrete is described in Test Method D7234 . This test offers two test protocols. Protocol 1 (test to fracture) determines the greatest perpendicular force (in tension) that a surface area can bear before a plug of material is detached. Protocol 2 (pass/fail) determines if the coated surface remains intact at a defined load criteria. Fracture will occur along the weakest plane within the system comprised of the test fixture, glue, coating system, and substrate, and will be exposed by the fracture surface. This test method maximizes tensile stress as compared to the shear stress applied by other methods, such as scratch or knife adhesion, and results may not be comparable. Note 1: The procedure in this standard was developed for metal substrates, but may be appropriate for other rigid substrates such as plastic and wood. Factors such as loading rate and flexibility of the substrate must be addressed by the user/specifier. Note 2: The procedure in this standard was developed for use on flat surfaces. The results could have greater variability with lower values and averages for surfaces other than flat. 1.2 Pull-off strength measurements depend upon material, instrumentation and test parameters. Results obtained by each test method may give different results. Results should only be assessed for each test method and not be compared with other instruments. There are five instrument types, identified as Test Methods B-F. It is imperative to identify the test method used when reporting results. Note 3: Method A, which appeared in previous versions of this standard, has been eliminated as its main use is for testing on concrete substrates (see Test Method D7234 ). 1.3 This test method describes a class of apparatus known as portable pull-off adhesion testers. 2 They are capable of applying a concentric load and counter load to a single surface so that coatings can be tested even though only one side is accessible. Measurements are limited by the strength of adhesive bonds between the loading fixture and the specimen surface or the cohesive strengths of the glue, coating layers, and substrate. 1.4 This test can be destructive and spot repairs may be necessary. 1.5 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. 1.6 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. 1.7 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 ====== 4.1 The pull-off strength of a coating is a performance property that may be referenced in specifications. This test method serves as a means for uniformly preparing and testing coated surfaces, and evaluating and reporting the results. This test method is applicable to any portable apparatus meeting the requirements for determining the pull-off strength of a coating in this standard (see Annex A1 – Annex A5 ). 4.2 Variations in results with the same coating are likely when any parameter of the test is changed. This includes change in glue, load fixture size, substrate coating cure time, pull rate, environmental conditions, if the coating is scored, or using a different device. Therefore, when a series of results will be compared with one another or used for statistical analysis, the type of apparatus, substrate, test procedures, glue type, and if scoring is used should be the same for the pulls considered. 4 It is recommended that these parameters and the environmental conditions allowed during the test be mutually agreed upon between the interested parties. 4.3 The purchaser or specifier shall designate a specific test method procedure; B, C, D, E, or F and test Protocol; 1, or 2, when calling out this standard. In cases where either the Protocol or a pass/fail criterion is not designated, Protocol 1 shall be used.