热喷Zn涂层浪花飞溅区腐蚀的室内模拟研究

海盐粒子浓度大、干湿交替频繁、海水冲击是浪花飞溅区腐蚀的3个关键性因素。文中以热喷Zn涂层为研究对象,设计了4种循环腐蚀试验制度:①盐雾–驻留循环;②盐雾–驻留–飞溅循环;③盐雾–干燥循环;④盐雾–干燥–飞溅循环,采用失重测量和电化学测量分别研究了涂层在这4种模拟环境下的腐蚀行为及规律,并应用加速转换因子法及灰关联分析对各循环腐蚀试验制度下的加速性、模拟性进行了研究,并为此设计了一个飞溅模拟研究装置以实现浪花飞溅冲击的模拟。试验结果表明:盐雾+驻留循环造成涂层的腐蚀最严重;盐雾+驻留+飞溅循环则能较好的模拟浪花飞溅区的腐蚀情况,可实现室内的热喷Zn涂层在浪花飞溅区腐蚀的模拟。

Laboratory Simulation Study on the Corrosion in Splash Zone of the Thermal Sprayed Zn Coating

Thermal spraying Zn coating for marine environment, especially in splash zone, are degraded due to different type of weathering parameters, mainly high salt particle concentration, frequently dry/wet and seawater splash three key factors. In this experimentation, the corrosion behavior of thermal spraying Zn coating in the simulate corrosion environment of splash zone have been studied by 4 different cyclic corrosion test systems: salt spray-dwell, salt spray-dwell - splash, salt spray-dry and salt spray-dry -splash cycle test. Acceleration and simulation of thermal spraying Zn coating in 4 cyclic corrosion test systems by Acceleration Shift Factor and grey relational space analysis were investigation. The experiment results show that the methods are effective and feasible. The salt spray-dwell-splash cycle test was one of a good method to simulate corrosion environment of splash zone in accordance with grey relational grade and experiment results. Meanwhile, a splash simulation test unit have been designed and made.