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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.
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. Siloxane resins and silicone polymers offer partial solutions to the limitations of bis-Phenol A epoxy coatings, but do not eliminate all of the limitations associated with this system. To fill this gap, a new class of organo-functional siloxane resins was developed by Dow Corning Corporation as epoxy resin crosslinkers providing flexible coatings with excellent recoat performance. Detailed work was done to compare modifications of a bis-phenol A epoxy paint using a variety of silicon-based technologies including aminopropyltrimethoxy silane, aminopropylmethyldiethoxy silane, methoxy-terminated siloxane resin, silanolterminated siloxane resin, and amine-terminated siloxane resin.
Solvent-free epoxy coatings have been widely specified and used over recent years in Australia as linings for a variety of immersion service exposures, specifically for potable water storage and tank linings for some petroleum products. However, they have not always delivered the durability or performance hoped for.
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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.
It is fair to say that maintenance in the worldwide oil and gas industry has changed dramatically over the past ten years. Facility owners are more than ever looking to reduce shutdown times, to improve plant efficiency and to extend plant lifetimes. With this comes the increased industry understanding about corrosion under insulation (CUI) with its deleterious impact and the ongoing desire for pragmatic high performance and cost-effective coating solutions.