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五、温度梯度下的腐 蚀特性评价试验 众所周知,环境介质中以水或水蒸汽对高分子材料的扩散渗透速度最为迅速。特别是在以玻璃钢或有机涂层作为设备衬里的情况下,当水蒸汽或水的移动方向与热量传递的方向一致时,水分的扩散渗透被加速,很快穿透衬里到达基材,在不易渗透的基材面上的空穴处积聚起来,使空穴内压力升高,从而使衬里与基材剥离,外观上形成“鼓包”。如果水蒸汽移动方向与热流方向相反,则扩散受到抑制。假
V. Evaluation Test of Corrosion Characteristics under Temperature Gradient It is well known that the diffusion and permeation speed of polymer materials with water or water vapor in the environmental medium is the fastest. Especially in the case of lining with FRP or organic coating as the equipment, when the direction of movement of water vapor or water coincides with the direction of heat transfer, the diffusion and penetration of moisture is accelerated, quickly penetrating the lining to reach the substrate. The cavities on the infiltrated substrate surface accumulate to increase the pressure in the cavities, thereby delaminating the liner from the substrate and forming a “bulging” appearance. If the steam moves in the opposite direction to the heat flow, the diffusion is suppressed. false