Influence of corrosion products on magnetic flux leakage signals in inspection of far-side metal-loss defects in oil storage tank bottom floors
Influence of corrosion products on magnetic flux leakage signals in inspection of far-side metal-loss defects in oil storage tank bottom floors
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DOI：
10.1627/jpi.47.19
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发表时间：
2004
影响因子：
1
通讯作者：
N. Kasai;K. Sekine;Hiroaki Maruyama
中科院分区：
文献类型：
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作者：
N. Kasai;K. Sekine;Hiroaki Maruyama
漏磁检测是一种可靠的远侧金属损耗型缺陷检测方法。铁磁性物质的腐蚀产物是在潮湿环境中产生的，因此可能会影响MFLT在实际储罐底板上的应用。研究了腐蚀产物对漏磁信号的影响。在试件上开出不同深度和宽度的矩形凹槽，填充不同比例的氧化铁作为腐蚀产物。用霍尔探头测量了沟槽的漏磁密度分布。用三维有限元方法分析了含腐蚀产物缺陷的漏磁场解析模型。根据实验和分析结果，讨论了检测中腐蚀产物对漏磁信号的影响。
Magnetic flux leakage testing (MFLT) is a reliable inspection method for far-side metal loss type flaws. Corrosion products of ferromagnetic substances are generated in wet environments, so may affect the application of MFLT to real tank bottom floors. This study investigated the influence of corrosion products on MFL signals. Rectangular grooves with various depths and widths were cut in test specimens and filled with various ratios of iron oxides as corrosion products. Magnetic flux leakage density distributions from the grooves were measured with a Hall probe. Analytical models for magnetic leakage field from flaws containing corrosion products were also considered using the three-dimensional finite element method. From the experimental and analytical results, the influence of corrosion products on MFL signals in inspections was discussed.