论文部分内容阅读
利用传统增重法和电化学阻抗测量技术研究了常压和深海高静水压力条件下水在环氧涂层中的传输行为。计算出了不同环境下水的扩散系数,并分析了静水压力对水在涂层中吸水动力学的影响。结果表明,高静水压力加速了水在涂层中的传输过程,使其扩散机制由常压下的理想Fick扩散行为变为S吸收型的非理想Fick扩散行为;扩散动力学参数,包括扩散速度、饱和时间和饱和吸水率均发生了明显变化;与涂层阻滞性能密切相关的涂层电容、涂层电阻和特征频率等参数随浸泡时间的变化在高压下也更为显著,涂层提前发生失效。
The transmission behaviors of water in epoxy coatings under atmospheric pressure and deep sea hydrostatic pressure were studied by using traditional methods of weight increase and electrochemical impedance measurement. The diffusion coefficient of water in different environments was calculated, and the influence of hydrostatic pressure on the water absorption kinetics of water in the coating was analyzed. The results show that the hydrostatic pressure accelerates the transport of water in the coating, and the diffusion mechanism changes from the ideal Fick diffusion at normal pressure to the S-absorption non-ideal Fick diffusion. The diffusion kinetics parameters including diffusion velocity , Saturated time and saturated water absorption have undergone significant changes. The parameters of coating capacitance, coating resistance and characteristic frequency, which are closely related to the retardation of coating, are also more significant under high pressure with the immersion time. Occurrence of failure.