通过电化学测试和宏观形貌分析，研究了剥离涂层下机坪管道用L245管线钢在不同缝隙深度处的腐蚀行为。结果表明：剥离涂层下不同位置L245钢电极自腐蚀电位的大小与缝隙深度有关；距破损点90 mm处钢电极腐蚀速率有先下降后回升而后再下降的显著变化，并且出现了warburg阻抗扩散弧和明显的弥散效应，是该腐蚀体系下缝隙腐蚀最明显的一个点；距破损点90 mm处钢电极表面腐蚀产物层有明显裂纹，150 mm处钢电极表面点蚀情况突出；涂层剥离会造成L245管线钢缝隙腐蚀，在机坪管道防护中应引起重视。

The corrosion behaviors of L245 pipeline steel under stripping coating at different gap depths were studied by electrochemical test and macro morphology analysis. The results showed that the self corrosion potential of L245 steel electrode at different positions under the stripping coating was related to the gap depth. The corrosion rate of steel electrode at 90 mm from the damage point decreased first, then increased and then decreased, and Warburg impedance diffusion arc and obvious dispersion effect appeared, which was the most obvious point of crevice corrosion under this corrosion system; There were obvious cracks in the corrosion product layer on the surface of the steel electrode 90 mm away from the damage point, and the pitting corrosion on the surface of the steel electrode 150 mm was prominent. Coating peeling may cause crevice corrosion of L245 pipeline steel, which should be paid attention to apron pipeline protection.