<正> 一、引言 我们曾经报导过使用直流电阻法、吸收电流法以及交流电阻、电容法评价高分子材料及涂层的耐蚀行为。文献[2,3]所讨论的是涂层与金属基体两侧处于相同温度的情况。而在实际使用中涂层一侧往往与金属基体一侧的温度并不相同,或者说涂层内部存在着温度梯度(例如输油管道、海轮等),且又常常是涂层与液体介质接触的一面温度较高、基材的温度较低,从而在涂层中形成正向温度梯度。因此,研究存在温度梯度情况下涂层的耐蚀行为具有重要的实用价值和理论意义。
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.
参考文献
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