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Remote Estimation of Degree of Corrosion Using Ultrasonic Pulse Echo Methods

机译：超声波脉冲回波法远程估算腐蚀程度

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摘要

Even though the engineering structures are designed to achieve the potential to be very durable and capable of withstanding the degradation caused by adverse environmental conditions, failures in the structures do still happen; predominantly due to corrosion. Even though there are many conventional methods to evaluate the degree of corrosion, most of them are destructive. Though there are significant efforts made to estimate the degree of corrosion nondestructively, reliable methods are yet to be established especially, for hidden or inaccessible corrosion. Moreover, the available methods, whether destructive or nondestructive, focus only on the surface corrosion (except in the cases of intergranular corrosion [IGC] of stainless steel) completely ignoring the corrosion pits that form beyond the limits of surface corrosion. Hence, this study includes these corrosion pits in estimating the degree of corrosion. In this study, selected steel samples were subjected to accelerated corrosion conditions and then tested ultrasonically. Ultrasonic longitudinal wave velocity to shear wave velocity ratio and the attenuation coefficient were measured using Ultrasonic Flaw Detector. These measurements were done even after removing the corrosion products from the surface. SEM analysis and the conventional weight loss measurements were also carried out. The correlations obtained between the degree of corrosion and ultrasonic parameters are presented.
机译：即使工程结构被设计为具有非常耐用的潜力并能够承受不利的环境条件引起的退化，但结构中的故障仍然会发生。主要是由于腐蚀。即使有许多常规方法可以评估腐蚀程度，但大多数方法都是破坏性的。尽管已经做出了巨大的努力来非破坏性地估计腐蚀的程度，但是尤其是对于隐藏的或难以接近的腐蚀，尚未建立可靠的方法。此外，可用的方法，无论是破坏性的还是非破坏性的，都只集中在表面腐蚀上（不锈钢的晶间腐蚀[IGC]除外），完全忽略了超出表面腐蚀范围而形成的腐蚀坑。因此，这项研究在估计腐蚀程度时包括了这些腐蚀坑。在这项研究中，选定的钢样品要经受加速的腐蚀条件，然后进行超声波测试。使用超声波探伤仪测量超声波纵波速度与剪切波速度之比和衰减系数。即使从表面去除腐蚀产物，也要进行这些测量。还进行了SEM分析和常规的失重测量。介绍了腐蚀程度与超声参数之间的相关性。

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