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Traditional coating systems for steel have often used a sacrificial primer, barrier coat and topcoat, to provide good UV resistance and appearance. One fundamental problem with all organic coating systems is that there will always be some permeation through the coating. These systems are therefore sacrificial in nature and have a finite life. The use of multi-coat systems also dramatically increases application time, presenting problems both for new construction and maintenance projects.
Traditional coating systems for steel have often used a sacrificial primer, barrier coat and topcoat, to provide good UV resistance and appearance. One fundamental problem with all organic coating systems is that there will always be some permeation through the coating. These systems are therefore sacrificial in nature and have a finite life. The use of multi-coat systems also dramatically increases application time, presenting problems both for new construction and maintenance projects. Whilst it is not possible to produce a totally impermeable organic lining, osmosis can be dramatically reduced by careful formulation. If permeation can be reduced to very low levels, it is possible to produce barrier coatings with very long service lives compared with sacrificial systems. The best pigment used for this purpose is high-quality glassflake
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Glassflake composite coating systems have proven track records of long term corrosion protection in aggressive service applications. They offer design and actual life for many applications of decades rather than years. This paper will review some of the changes, which have occurred over recent years.
The construction industry has struggled to fully embrace the philosophy of defect prevention rather than detection as a quality objective. Quality is more often discussed in sales presentations and marketing literature than in strategic plans or board meetings. This paper explores quality principles and methodologies employed in the manufacturing industry over the past twenty years that have resulted in measurable performance improvements yet are not adopted by the construction industry.