ACFM: Application of ACFM for inspection through metal coatings
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.
Keywords: ACFM; Comsol multiphysics; flame-sprayed aluminium; metal coatings; zinc galvanising
Document Type: Research Article
Affiliations: TSC Ltd, 6 Mill Square, Featherstone Road, Wolverton Mill, Milton Keynes MK12 5RB.
Publication date: 01 June 2010
- Official Journal of The British Institute of Non-Destructive Testing - includes original research and development papers, technical and scientific reviews and case studies in the fields of NDT and CM.
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