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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。
I. Introduction We have reported on the use of DC resistance method, absorption current method and AC resistance, capacitance method to evaluate the corrosion resistance of polymer materials and coatings. The literature [2,3] discusses the case where the coating is on the same temperature as the sides of the metal substrate. In actual use, however, the temperature on the side of the coating, which is often not the same as the temperature on the side of the metal substrate, or in the interior of the coating, such as oil pipelines, marine vessels, etc., and often the coating is in contact with the liquid medium On the one hand, the temperature is higher and the temperature of the substrate is lower, creating a positive temperature gradient in the coating. Therefore, it is of important practical value and theoretical significance to study the corrosion resistance of coatings in the presence of temperature gradient.