Broughton, W R; Lodeiro, M J (2003) Assessment of characterisation techniques for evaluating surface treatments for adhesive bonding. NPL Report. MATC(A)140

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Abstract

This report presents the results of an experimental study carried out to assess techniques for evaluating surface treatments of metallic and polymeric composite materials for adhesive bonding. The techniques assessed include: contact and non-contact profilometry (surface roughness), contact angle (wettability), micro-hardness, gloss/reflectivity, colorimetry, ellipsometry and surface resistivity. Optically stimulated electron emission (OSEE) is also examined. The techniques are assessed in terms of: ability to differentiate between treatments and level of treatment, suitability for laboratory trials or on-line inspection, ease of use, equipment costs, material compatibility and measurement uncertainty. Trials were conducted on grit-blasted, chromic acid etched and anodised aluminium alloys, oil lubricated hot-dipped galvanised steel, and corona discharge treated glass fibre-reinforced polypropylene. The report also includes mechanical test data obtained at the National Physical Laboratory (NPL) and extracted from published literature.
The results from the study show that most of the techniques studied were useful in determining changes in surface properties for different levels of treatment. Contact angle and colorimetry techniques proved the most suitable for relating surface changes to the level of treatment and could potentially be used to improve or optimise adhesive strength and environmental durability.

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	MATC(A)140
Subjects:	Advanced Materials Advanced Materials > Adhesives
Last Modified:	02 Feb 2018 13:16
URI:	http://eprintspublications.npl.co.uk/id/eprint/2667

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