交流电对X80钢在近中性环境中腐蚀行为的影响

发布时间：2018-03-19 14:15

  本文选题：X管线钢　切入点：交流电　出处：《金属学报》2017年05期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:The effect of AC on the corrosion behavior of X80 steel in near neutral environment was studied by means of data acquisition, electrochemical test, immersion test and surface analysis. The form of AC corrosion changed from total corrosion to local corrosion, and there were more pitting pits on the surface of the sample. Under the alternating interference of full wave alternating current positive and negative half-wave, the X80 steel produced cathode and anode polarization, which resulted in the partial dissolution of Fe and the precipitation of H; The negative half-wave AC interference will lead to hydrogen evolution and hydrogen induced anodic dissolution, and the pitting pits will be sharp, while under the positive half-wave interference, only anodic dissolution will occur, and the resulting pitting pits will be concave. The corrosion products produced on the surface of X80 steel under different waveforms of AC interference were not consistent: under the interference of full wave and positive half wave, the corrosion products were loose and cracked without a-FeOOH, and the corrosion products on the surface of X80 steel were denser under negative half-wave AC interference. The corrosion product exists a-FeOOH, which has a certain protective effect on the matrix.
【作者单位】： 北京科技大学新材料技术研究院;航天材料及工艺研究所;中国科学院宁波材料技术与工程研究所;
【基金】：国家自然科学基金项目Nos.51371036;51131001和51471034~~
【分类号】：TG178
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本文编号：1634620