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THE CORROSION RESISTANCE AND CORROSION MECHANISM OF BROMINATED BISPHENOL—A TYPE UNSATURATED POLYESTER RESIN |
Zeng Xiaoqing Zhou Runpei (East China University of Chemical Technology) |
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Abstract Many techniques,such as the Q-t curves,IR,XPS ,SEM etc.,are used to examine the corrosion resistance of brominated bisphenol-A type unsaturated polyester resin (code name FZ) and to deduce its corrosion mechanism in a series of chemical media ,involving boiling de-ionized water,20% and 5% NaOH aqueous solution at 60℃ ,and 20%o and 5% HCl aqueous solution at 60℃.The results show that FZ resin displays outstanding corrosion resistance.There are evidances that the bromine element does not drop out during immersion process. When immersed in boiling deionized water for a long time(70 days), part of ester groups of the resin are hydrolyzed and small molecules, such as alcohol and carboxy acid etc.,run into media .There are not only small molecules produced during hydrolysis process but also end carboxyl negative ions when the resin is immersed in 20% NaOH aque- ous solution at 60℃ for the same time.
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Received: 25 August 1990
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