海水温度对深海用环氧涂层防护性能的影响

采用电化学阻抗谱(EIS)技术,研究了环氧重防腐涂层在不同温度海水中的腐蚀电化学行为.结果表明,随着海水温度的升高,涂层体系的涂层电容值的升高和涂层电阻值的降低均加快,说明海水温度的升高,加速了涂层防护性能的下降,加快了基体金属的腐蚀.浸泡初期,在不同温度的海水中,水在涂层中的扩散均符合Fick扩散第二定律,扩散活化能为49.7kJ·mol^-1.随着海水温度的升高,涂层中水的扩散系数增大,涂层吸水达到饱和的时间缩短,但饱和吸水量变化不大.

Seawater temperature on the protection properties of epoxy coatings used in deep sea

The electrochemical corrosion behavior of epoxy heavy-duty coatings immersed in seawater at different temperatures was investigated by electrochemical impedance spectroscopy (EIS). The results show that the increase in capacitance and the decrease in resistance of the coatings both change faster with rising temperature, indicating that higher seawater temperatures accelerate degradation of the coatings. At the initial immersed period, the diffusion process of seawater through the coatings follows the second Fick diffusion law at any seawater temperature and the diffusion activation energy is 49.7 kJ·mol^-1. The diffusion coefficient of seawater across the coatings increases as the seawater temperature rises, and the time for the coatings to reach the maximum water absorption capacity shortens, but the saturated capacity for water absorption of the coatings changes little.