Application of ACFM for inspection through metal coatings
Application of ACFM for inspection through metal coatings
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DOI：
10.1784/insi.2010.52.6.310
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发表时间：
2010-06-01
期刊：
影响因子：
1.1
通讯作者：
Lugg, M.
中科院分区：
文献类型：
--
作者：
Blakeley, B.;Lugg, M.
ACFM 是一种电磁无损检测技术，用于通过各种非导电涂层检查金属结构是否存在表面断裂裂纹。然而，如果涂层是导电的，例如火焰喷涂铝或镀锌，则结构的电磁表面特性会改变。这些金属涂层使用 Comsol 多物理场进行建模，并通过金属涂层样品的实验验证了该模型。结果表明，尺寸精度会降低，具体取决于涂层厚度以及裂纹是否穿透导电涂层。如果金属涂层厚度太厚，则缺陷可能会被完全掩盖。
ACFM is an electromagnetic NDT technique used to inspect metal structures for surface-breaking cracks, through a variety of non-conductive coatings. However, if the coating is conductive, such as flame-sprayed aluminium or zinc galvanising, the electromagnetic surface properties of the structure are altered. These metallic coatings were modelled using Comsol multiphysics, and the model verified by experiments with metal-coated samples. The results show that accuracy of sizing is decreased, depending on coating thickness and whether the crack penetrates through the conductive coating or not. If the metal coating thickness is too thick, then defects may be completely masked.