冷却塔防腐涂层失效评价方法

在循环水和除盐水中进行了冷却塔酚醛环氧涂层和环氧煤焦沥青涂层试块的热水加速老化试验,测量了涂层试块在老化过程中的吸水率并观察了其形貌变化.通过分析涂层试块吸水率随吸水时间和老化时间的变化规律,研究了循环水冷却塔防腐涂层使用寿命的评价方法.发现根据冷却塔涂层试块老化过程中的吸水率-老化时间曲线拐点可推算出涂层在试验温度下的使用寿命,然后再根据范特霍夫(Vant Hoff)规则可推算出涂层在实际运行工况下的使用寿命.

Evaluation method for anticorrosion coating failure of cooling towers

Concrete specimens were coated with epoxy phenolic coatings and coal tar epoxy coatings, respectively. Hot water accelerated aging tests of the coated concrete specimens were carried out in circulating water and deionized water. In the aging process, the water absorbing capacity of these coatings was measured and the surface morphologies were observed. The dependence of water absorbing capacity on suction time and aging time was analyzed to find out a method for evaluating the service life of anticorrosion coatings on cooling towers with circulating water. It is indicated that the service life of the coatings at the test temperature can be predicted according to the inflection point on the curve of water absorbing capacity to aging time, and then the service life at the service temperature can also be calculated based on the Vant Hoff regulation.