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Title: The Scanning Kelvin probe applied to mechanisms of delamination in organic coated steels
Author: Loveridge, M. J.
Awarding Body: University of Wales Swansea
Current Institution: Swansea University
Date of Award: 2005
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The objectives set out for the work detailed within this thesis can be considered on two levels. First of all a principal objective was to obtain a detailed understanding of the kinetics and mechanism of coating delamination as it affects prepainted and laminated organic coated steels. The second part involves identification of new corrosion inhibitors, pretreatments, adhesives and primer systems which will greatly improve delamination resistance, and hence corrosion resistance in steel products. A thorough, systematic study of the above has enabled the project to deliver quantitative mechanistic models of delamination phenomena as they affect coated steel products. Also obtained has been valuable, detailed information on the influence of conventional and novel corrosion inhibitors and pretreatments. Insight gained from the study has enabled us to identify new materials for incorporation into organic coated steel with greatly improved delamination resistance. The pigments investigated were alkali earth-exchanged bentonite, phosphate-exchanged hydrotalcite and the Polyaniline Emeradine salts of para-Toluene sulphonate, Camphor sulphonate and Phenyl phosphate. Fresh insight has recently been obtained into the Scanning Kelvin probe Technique (SKP) and its application of the investigation of the kinetics and mechanism of coating delamination processes occurring concurrently with corrosion at cut-edges and defects in prepainted and laminated organic coated steel products. SKPT is capable of following the progress of a delamination front beneath apparently intact coatings. The SKP was used to systematically investigate the influence of several novel corrosion inhibitor pigments and pigment-pretreatment synergy on the kinetics and mechanism of coating delamination. This approach has enabled a better characterisation of existing materials and to identify new, high performance materials for the manufacture of improved coated steel products. Where possible the SKP findings have been supported by parallel investigations using SIMS (Secondary Ion Mass Spectroscopy).
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Eng.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available