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Improved selection of testing protocols for corrosion coatings, along with proper interpretation of the results, allows for a better representation of how coatings will perform in service. A review of several types of corrosive service environments is presented, including the testing normally performed, along with a more in depth look at how to quantify performance variables in a rating system based on individual test results.
Bis-Phenol A epoxy resin-based coatings are known for excellent corrosion and chemical resistance. Limitations of this class of coatings are poor flexibility, thermal stability and weather resistance. Traditional siloxane resins are commonly used in the industry to improve the thermal and weather resistance of bis-Phenol A epoxy coatings. In addition, organo-functional silicone polymers have been used to provide improved flexibility, but create recoatability issues.
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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.
The free flood areas of underwater vehicles pose a significant and expensive corrosion problem to operating forces. These areas undergo an alternating cycle of wetting and drying in a closely confined area that has regions of relatively stagnant seawater and other regions of high turbulence. The corrosion induced damage requires constant upkeep by ship’s force and frequent expensive maintenance action by depot personnel to effect periodic full restoration.