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Title: Relationship between the microstructure and corrosion resistance of Galfan coated steels
Author: Elvins, J.
Awarding Body: University of Wales Swansea
Current Institution: Swansea University
Date of Award: 2005
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The drivers for the work detailed within this thesis are twofold. Firstly the overwhelming goal of the project was to determine if a relationship existed between the microstructure of the Galfan galvanising coating and the subsequent corrosion protection it provided to the steel substrate. The secondary driver was to act upon the information obtained and improve the corrosion resistance by variations in chemistry or altering the processing conditions. To this end a novel method for quantifying Galfan microstructure was developed and used in conjunction with the Scanning Vibrating Electrode Technique (SVET) to measure the performance of a series of Galfan Coatings. A combination of samples produced at Corus Colours, Shotton and samples produced using a Rhesca Hot Dip Simulator were used to complete the studies. Initial work was undertaken using line produced samples from the original British Steel Galfan trials. The microstructural analysis of these samples revealed variations in the volume percentage of primary zinc, along with significant variation in primary zinc dendrite number and size. SVET testing was performed along the cut edge of these organically coated samples. Analysis of these experiments revealed a linear trend such that increasing the volume percentage of primary zinc led to an increase in the SVET recorded zinc loss. Combining this data with zinc runoff and organic coating delamination data from external weathering experiments, revealed that the SVET is a versatile tool being able to indicate zinc runoff levels and consequently providing limited accelerated weathering data.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Eng.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available