基于脉冲调制涡流检测新方法的亚表面腐蚀缺陷定量评估理论和技术研究

It is crucial to non-destructively and quantitatively evaluate subsurface corrosion, which occurs in the pipe wall and interlayer of metallic pipes in in-service apparatus due to hostile and corrosive environments. In light of the fact that conventional Pulsed Eddy Current technique (PEC) has technical drawback, this project proposes Pulse-modulation-based Eddy Current technique (PMEC) in order to enhance the accuracy and efficiency of quantitative evaluation of subsurface corrosion in metallic pipes. The research involves: (1) to establish the efficient simulation method of PMEC of subsurface corrosion in metallic pipes; (2) to establish the manufacture process for fabricating simulated subsurface corrosion in metallic pipes; (3) to implement the PMEC probe and system for quantitative evaluation of subsurface corrosion in metallic pipes; and (4) to establish the theory regarding reconstruction of subsurface corrosion based on PMEC, and realise the reconstruction of the natural subsurface corrosion in practical pipes. This project opens up the application of PMEC to evaluation and maintenance of large-scale and complex apparatus, mitigates the drawback of PEC, and promotes the development of PEC for non-destructive and quantitative evaluation of subsurface corrosion in metallic pipes.

由于腐蚀、温差等复杂服役环境，在役装备关键金属管件内壁和多层管夹层中可能产生亚表面腐蚀缺陷，严重威胁装备安全，对其进行无损定量评估具有重要意义。为提高传统脉冲涡流检测技术对亚表面腐蚀缺陷的检测性能，本项目提出基于脉冲调制波激励的新型脉冲涡流检测方法，即脉冲调制涡流检测技术，以提升金属管件亚表面腐蚀缺陷无损定量评估精度与效率。针对这一新方法，就以下几个方面开展研究工作：1）建立脉冲调制涡流检测金属亚表面腐蚀缺陷高效仿真方法；2）确立缺陷参数可控的金属管件亚表面模拟腐蚀缺陷人工制备方法；3）开发金属管件亚表面腐蚀缺陷定量评估用脉冲调制涡流检测专用探头和检测系统；4）确立金属管件亚表面腐蚀缺陷脉冲调制涡流检测定量重构理论和实现方法。本项目所提脉冲调制涡流定量评估新技术有望提高大型、复杂装备结构安全评估精度和效率，对促进脉冲涡流检测技术和金属管件亚表面腐蚀缺陷无损定量评估技术的发展具有重要意义。

由于腐蚀、温差等复杂服役环境，在役装备关键金属板/管件内壁和多层管夹层中可能产生亚表面腐蚀缺陷，严重威胁装备安全，对其进行无损定量评估具有重要意义。为提高传统脉冲涡流检测技术对亚表面腐蚀缺陷的检测性能，本项目提出基于脉冲调制波激励的新型脉冲涡流检测方法，即脉冲调制涡流检测技术，以提升金属构件亚表面缺陷无损定量评估精度与效率。针对这一新方法，项目围绕检测高效仿真、缺陷人工制备、检测探头及系统开发、缺陷可视化定量评估，四个研究内容开展相关工作。通过系列研究工作：1）建立并验证了脉冲调制涡流检测金属亚表面腐蚀缺陷高效仿真方法；2）确立了缺陷参数可控的金属板/管件亚表面模拟腐蚀缺陷人工制备方法；3）研发了金属板/管件亚表面腐蚀缺陷定量评估用脉冲调制涡流检测专用探头和检测系统；4）确立了金属板/管件亚表面腐蚀缺陷脉冲调制涡流检测可视化定量评估理论和实现方法。本项目所提脉冲调制涡流定量评估新技术提高了大型、复杂装备结构安全评估精度和效率，对促进脉冲涡流检测技术和金属构件亚表面腐蚀缺陷无损定量评估技术的发展具有重要意义。