采用压力釜模拟深海环境、结合电化学交流阻抗技术研究了Intershield 300 ENA301有机涂层在3.5%NaCl水溶液中的电化学行为.结果表明,相同厚度的有机涂层在3MPa压力条件下的阻抗和电化学反应阻抗较常压下小一个数量级以上,而涂层电容却大很多.涂层特征频率表明,在3MPa压力条件下的特征频率较常压下的高很多,表明涂层在压力作用下缺陷率高于常压条件,压力加速了有机涂层的失效.
The electrochemical behavior of an Intershield 300 ENA301 coating on steel 907A in 3.5% NaCI solution was studied in a simulated deep ocean environment with a high-pressure autoclave. The re-suits indicated that the impedance resistance and electrochemical reaction resistance of the coating under 3 MPa was tenfold smaller than that under ordinary atmosphere. The capacitance of the coating under 3MPa was higher than that under ordinary atmosphere. The characteristic frequency fh of the coating under 3 MPa was greatly higher than that under ordinary atmosphere which indicated that the defect ratio of the coating under 3MPa was much more than that under ordinary atmosphere,and the high-pressure acceler-ated the failure process of the coating in 3.5% NaC1 solution.
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