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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.
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Due to very severe conditions at offshore, conventional coatings do not work as they require multicoats to acquire high thickness and their curing times are rather high, giving chances for the contamination by severe environment (high RH and salt) in the intermediate layers. Thus, modern coatings which can give larger thickness in just one single coat and cure in a few minutes time are required for critical applications such as splash zone which is marred by continuous dry and wet spell.
Corrosion and cavitation erosion on steel structures are problems and can have a huge impact on safety and economy. In order to prevent corrosion, protective coatings can be used as a barrier between the steel surface and the corrosive elements such as seawater or various liquid cargos. However, when coating systems fail the surface will be exposed to the environment with all consequences. From that perspective, the weakest link is the coating used to protect the steel.
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.