ISO 14916:2017规定了通过拉伸试验确定热喷涂涂层在垂直于涂层表面的方向拉伸下的拉伸粘合强度的程序。通过使用该程序,可确保测试结果的可比性。
该试验旨在确定热喷涂涂层和基材之间或粘结层和面漆之间的拉伸粘合强度和/或涂层系统相关涂层的内聚强度。在某些情况下,热喷涂涂层可能有两层以上。本文件中规定的方法也适用于测定由两层以上组成的涂层系统中不同层界面之间的拉伸粘合强度。
该试验足以比较使用相同或类似原料和热喷涂工艺制造的涂层。
拉伸粘合强度试验的目的不是提供绝对值,用于评估涂层在使用过程中的耐久性。
该试验用于评估基材制备、喷涂条件和工艺参数对热喷涂涂层拉伸粘合强度的影响。它还可以用于监控制造和喷涂过程的一致性。
注:该拉伸试验也适用于非常薄的涂层。此外,使用合适的粘合剂(箔材而非液体),可将粘合剂渗透到含有所需孔隙率水平的热喷涂涂层中的程度降至最低。有关更多说明,请参考6.5.3。本拉伸试验不适用于测定使用自熔胶沉积的熔融喷涂涂层的粘合强度-
熔剂合金由于其固有的高粘附强度值。
ISO 14916:2017 specifies the procedure to determine the tensile adhesive strength of thermally sprayed coatings under tension in the direction normal to the surface of the coating by applying a tensile test. By using this procedure, comparability of the test results is ensured.
The test is intended to determine the tensile adhesive strength between the thermally sprayed coating and the substrate material or between the bond and top coat and/or of the cohesive strength of the related coat of the coating system. In some cases, thermally sprayed coatings might have more than two layers. The method specified in this document applies also to determine the tensile adhesive strength between the interfaces of different layers in a coating system which consists of more than two layers.
This test is sufficient to compare coatings manufactured using same or similar feedstock materials and thermal spray processes with each other. The tensile adhesive strength test is not intended to provide absolute values for evaluation of the durability of coatings under operational use.
The test is used to assess the influence of substrate preparation, the spraying conditions and the process parameter on the tensile adhesive strength of thermally sprayed coatings. It can also be employed in order to monitor the consistency of the manufacturing and spraying processes.
NOTE This tensile test can also be applied to very thin coatings. Moreover, the infiltration of bonding agent into the thermally sprayed coatings containing a required level of porosity can be minimized using an appropriate bonding agent (foil rather than liquid). For further instructions, please refer to 6.5.3. This tensile test is inappropriate for determining the adhesive strength of fused spray coatings deposited using self-fluxing alloys due to their inherent high adhesion strength values.