سال انتشار: ۱۳۸۶

محل انتشار: اولین کنفرانس لوله و صنایع وابسته

تعداد صفحات: ۹

نویسنده(ها):

Behrang Moeini – Islamic azad University (South of Tehran Branch Iran Engineering Inspection CO(I.E.I)

چکیده:

Fusion bonded epoxy coating, also known as fusion-bond epoxy powder coating and commonly referred to as FBE coating, is an epoxy based powder coating that is widely used to protect various sizes of steel pipes used in pipeline construction, concrete reinforcing rebars and on a wide variety of piping connections, valves etc. from deterioration due to corrosion. FBE coatings are thermoset polymer coatings. They come under the category of ‘protective coatings’ in paints and coating nomenclature. The name ‘fusion-bond epoxy’ is derived from the way of resin cross-linking and their method of application which is different from that of a conventional liquid paint. FBE coatings are in the form of dry powder at normal atmospheric temperatures. The resin and hardener parts in the dry powder remain unreacted at normal storage conditions. At typical coating application temperatures, usually in the range of 180 to 250 °C, the contents of the powder melt and transform to a liquid form. The liquid FBE film "wets and flows on to" the steel surface, on which it is applied, and soon becomes a solid coating by chemical cross-linking, assisted by heat. This process is known as “fusion bonding”. The chemical cross-linking reaction taking place in this case is "irreversible", which means
once the curing takes place, the coating cannot be converted back into its original form by any means. Application of further heating will not “melt” the coating and thus it is known as a “thermoset” coating. World’s leading FBE manufacturers are Jotun Powder Coatings, 3M, DuPont, Akzo Nobel, BASF and Rohm & Haas.