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通过数据采集、电化学测试、浸泡实验和表面分析技术研究了交流电对X80钢在近中性环境中腐蚀行为的影响。结果表明,交流电干扰下,随着交流电密度的增大,交流腐蚀形态发生变化,由全面腐蚀转变为局部腐蚀,且试样表面产生较多的点蚀坑。全波交流电正负半波交替干扰下,X80钢发生阴阳极极化,导致Fe的局部溶解和H的析出;负半波交流干扰下会导致析氢而发生氢致阳极溶解,产生的点蚀坑均较尖锐;正半波干扰下,只发生阳极溶解,产生的点蚀坑呈现凹形,且比较平滑。不同波形交流干扰下,X80钢表面产生的腐蚀产物不一致:全波和正半波干扰下,腐蚀产物较疏松且发生龟裂,无a-FeOOH;负半波交流干扰下,X80钢表面腐蚀产物较致密,腐蚀产物存在a-FeOOH,对基体具有一定的保护作用。
The effects of alternating current on the corrosion behavior of X80 steel in near-neutral environment were studied by data acquisition, electrochemical tests, immersion experiments and surface analysis techniques. The results show that with the increase of AC density, the morphology of AC corrosion changes from AC to AC under the interference of alternating current, and more pitting corrosion occurs on the surface of the sample. Full-wave alternating current positive and negative half-wave alternating interference, X80 steel cathodic polarization occurs, leading to the local dissolution of Fe and H precipitation; Negative half-wave AC interference will lead to hydrogen evolution and hydrogen-induced anodic dissolution, the resulting pitting pit Are more sharp; positive half-wave interference, only anodic dissolution, resulting pits showing concave, and relatively smooth. Under the interference of different wave forms, the corrosion products produced on the surface of X80 steel are inconsistent. The corrosion products are loose and cracked without full-wave and positive half-wave interferences, without a-FeOOH. Dense, corrosion products exist a-FeOOH, the matrix has a protective effect.