The design and application of a decrement “Q” meter as a non-destructive adhesion test for coatings

J. A. Muaddi Dr J. A. Muaddi obtained his Ph.D. at the University of Aston in Birmingham—Department of Electrical Engineering and has now returned to Jordan.

M. Izzard M. Izzard is a research student studying for a Ph.D. in the Department of Mechanical and Production Engineering at the University of Aston in Birmingham. He is working on the production of electroless nickel composite coatings—co—operating with W. Canning Materials Ltd. Previously he has been employed by George Fisher Casting Ltd and Foseco F. S. Ltd.

J. K. Dennis Dr J. K. Dennis is a senior lecturer in the Department of Mechanical and Production Engineering at the University of Aston in Birmingham. He is a member of several IMF committees and has been involved in metal finishing research for many years.

J.F.W. Bell Professor J. F. W. Bell was a Reader in the Department of Electrical Engineering at Aston University and is now at the University of Cape Town in South Africa.

Summary

The paper describes an electronic instrument to evaluate the integrity of solids and to test adhesive bonds of specimens vibrating flexurally within the audible frequency range. The principle is to excite vibrations in a sample, interrupt the driving signal and count the number of oscillations of the freely decaying vibrations between two known preselected amplitudes of oscillation. An example of its use to determine the adhesion of electroplated nickel on aluminium is given.

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The design and application of a decrement “Q” meter as a non-destructive adhesion test for coatings

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