基于电磁感应红外热成像技术的涂层缺陷检测

Coating Defect Detection Based on Electromagnetic Induction Infrared Thermal Imaging Technology

为了实现涂层缺陷的无损可视化检测,本文基于电磁感应红外热成像系统对缺陷涂层钢板进行了缺陷检测,根据红外热像图中颜色明暗差异、缺陷形状以及缺陷与临界温差大小建立了不同涂层缺陷类型的定性评判准则。将该准则用于识别涂层在海洋环境腐蚀失效过程中出现的缺陷,结合Kelvin电位分布和电极形貌可见光图像验证了涂层缺陷判断准则的可靠性。

Usually,early failures of anti-corrosion coating for marine engineering equipment are difficult to be detected in time,and indeed such failures are potential safety hazard.Herein,defects in coatings on steel plate were detected via electromagnetic induction infrared thermal imaging system,aiming in realizing non-destructive visual detection of coating defects.Meanwhile,qualitative evaluation criteria for different type of coating defects were proposed,according to the comprehensive assessment of the acquired infrared thermal images in terms of the color brightness difference throughout the image,the temperature difference between defects and their adjacent area,as well as the shape of defects in the acquired infrared thermal images.The established criteria of coating defect types may be used to identify defects occurred in coatings during their service process in marine environment,and the reliability of the criteria is verified by the Kelvin probe measured potential distribution and visible light images of the relevant coatings.