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| CORROSION BEHAVIOR OF HIGH POLYMER COAT UNDER CERTAIN TEMPERATURE GRADIENT |
| Wu Zhiying Li Guolai and Li Fake (East China Institute of Chemical Technology) |
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Abstract The corrosion protective property of high polymer coat under certain temperature gradient was studied by using electric capacity method. The temperature of the coat which contacts the liquid medium is 40℃ and the temperature of the metal substrate is 21, 30, 40 and 60℃ respectively. The results indicate that if the surface of the coat in contact with the liquid medium is at higher temperature and the temperature of metal substrate is kept lower, the liquid will penetrate into the coat more quickly, theelectric capacity will become larger, and the life of the coat will be shortened. On the contrary, if the coat in contact with the liquid medium is at lower temperature and the temperature of the metal substrate is kept higher, the life of the coat will last longer.The penetration caused by temperature gradient plays more negative effect to the life of a coat than the penetration caused by concentration gradient does.
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Received: 25 June 1988
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[1] 李国莱、吴志英等,中国腐蚀与防护学报3(3) ,159(1983)
[2] 李法科、李国莱等,华东化工学院学报,(Ⅰ)83(1985)
[3] 李法科、李国莱等,中国腐蚀与防护学报,6(4) ,241(1986)
[4] Brasher, D, H.; Kingsbury, A. H, J. Appl. Chem. 4(2) , 62 (1954) |
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