漏磁检测方法由于其简便、快捷、结果准确等特点,在现在无损检测领域得到越来越广泛的应用.但是在现场检测过程中,由于提离值波动、铁磁性杂物等影响,使得漏磁检测量化结果会产生误差,甚至会产生误判.这对检测结果的准确性有很大的影响.本文研究了缺陷腐蚀产物与漏磁场之间的关系,利用有限元方法建立直径、深度相同腐蚀产物厚度不同的漏磁检测模型,通过计算得到不同腐蚀产物厚度模型漏磁场分布,对比分析结果表明:无腐蚀产物缺陷的漏磁场最明显,随着腐蚀产物厚度的增加,缺陷漏磁场变得越不明显.在实验室条件下进行了腐蚀产物影响实验,实验结果与有限元数值分析结果一致.%For magnetic flux leakage detection method is simple, quick and accurate and other characteristics, now it gets more and more widely used in nondestructive testing field. But in the field detection process, because the " lift-off" value fluctuation, magnetic sundry etc effects, resulting in magnetic flux leakage testing quantitative results will produce error, and even produce a miscalculation. This to the results of detection accuracy has very big effect. The relationship is studied between the corrosion products and the leakage magnetic field. The finite element method is used to establish the same depth and diameter, different thickness of the corrosion products of magnetic flux leakage testing model, through the calculation get different thickness of corrosion product leakage magnetic field distribution model, The results show that, no corrosion product defect has the most obvious of magnetic leakage field, with the increasing of the thickness of corrosion products, the defects of magnetic leakage field not become more and more not obvious. In the laboratory conditions, the corrosion-product-impact experiment is done, the experimental results and the finite element numerical analysis results are consistent.
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