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Assessment of the performance of three clear coatings for use in heritage conservation by an oxygen consumption technique

Lawson, Amber 2016. Assessment of the performance of three clear coatings for use in heritage conservation by an oxygen consumption technique. PhD Thesis, Cardiff University.
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Abstract

Without the protection provided by anti-corrosive paints, vehicles, bridges and industrial heritage would not have survived for long. Where these coatings fail or are damaged, ferrous metal requires further protection. To provide insight into coating failure a survey of paint layers and corrosion products found on historic wrought iron and mild steel was carried out around Scotland. Corrosion has also been found to be a major contributor to structural damage of historic armoured vehicles. When choosing coatings within conservation, decisions are based on qualitative data and practitioners’ experience rather than evidence based standards for specific ferrous alloys in particular environmental conditions. Limited quantitative data exists hence this research seeks to produce quantified data via a standardised approach. To provide environmental context for the laboratory based tests, temperature and humidity data from the Tank Museum has been considered. Thus the anti-corrosive performances of clear coatings on historic armoured steel have been assessed in controlled temperature and relative humidity by using a sensitive corrosion monitoring technique. For relevance to the conservation sector common materials, methodology and environmental conditions were considered and standardised. Aluminium oxide blasting of the steel removed contaminants and provided a keyed surface for Paraloid B72 and Cosmoloid H80, popular clear coatings within conservation and Siliglide 10, a modern silane based coating. All three coatings offered protection for the steel whether applied to cleaned surfaces or to pre-corroded surfaces. The best treatment method and thus the treatment recommended for protecting areas of paint-loss is to clean the surface and apply three layers of Paraloid B72. The standardised approach used allows other researchers to contribute comparable data to the production of a database and future standards within conservation.

Item Type: Thesis (PhD)
Status: Unpublished
Schools: History, Archaeology and Religion
Subjects: C Auxiliary Sciences of History > CC Archaeology
Q Science > Q Science (General)
Date of First Compliant Deposit: 26 January 2017
Last Modified: 25 Jan 2018 02:30
URI: http://orca.cf.ac.uk/id/eprint/97644

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