在模拟深海环境下,利用电化学阻抗技术并结合重量法,研究了循环压力对纯环氧涂层在3.5mass%NaCl溶液中失效行为的影响。结果表明,循环压力条件下,涂层的阻抗行为呈周期性变化规律:在高压条件下浸泡时,有机涂层电容较高、涂层电阻较低;而常压条件下两者都较高。循环压力增大,腐蚀介质更容易扩散到涂层内部,使得涂层吸水量增加,涂层电阻降低,涂层防护性能恶化。 In the simulated deep sea environment, electrochemical impedance technique and gravimetric method were used to study the effect of circulating pressure on the failure behavior of pure epoxy coating in 3.5mass% NaCl solution. The results show that under the condition of cyclic pressure, the impedance behavior of the coating changes periodically: when the coating is immersed under high pressure, the capacitance of the organic coating is higher and the resistance of the coating is lower; while under the normal pressure conditions, both are higher. Circulation pressure increases, the corrosion medium is more likely to spread to the coating inside, making the coating water absorption increases, the coating resistance decreases, the coating protective performance deteriorated.