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Corrosion Monitoring of Metal Alloys Using a Line-Focus Ultrasonic Transducer System

Jiang, Menghan (2019) Corrosion Monitoring of Metal Alloys Using a Line-Focus Ultrasonic Transducer System. Master's Thesis, University of Pittsburgh. (Unpublished)

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Abstract

Ultrasonic testing is a conventional non-destructive testing method and is considered as a promising approach for corrosion monitoring. The fundamental principles of ultrasonic testing in structural health monitoring have been studied comprehensively in the past decades. In this research, a line-focus PVDF ultrasonic transducer was designed, fabricated and applied to measure the Rayleigh surface wave velocity changes of some commercially available metal alloys during 5, 10, 15, 20 and 25 days of laboratory corrosion studies. The metal alloys investigated include 304 stainless steel, low-carbon steel, 6061 aluminum alloy, and multipurpose 110 copper. The corrosion tests were conducted by simulating these metal alloys subjected to seawater corrosion processing. For isotropic solid materials, the effective elastic modulus (Young’s modulus) can be indirectly characterized from the experimental measurement of the Rayleigh surface wave velocity. The experimental data acquired by the line-focus ultrasonic transducer system were analyzed, from which it was found that the values of Rayleigh surface wave velocities and the Young’s modulus decrease for 304 stainless steel, low-carbon steel and multipurpose 110 copper samples, while increase for 6061 aluminum alloy as the corrosion time increases during the experimental period. Clearly, the changing pattern of Rayleigh surface wave velocity of each of the metal alloys during corrosion processing could provide part of the predictive solutions for assessment and mitigation of corrosion; and the line-focus transducer system is promising for real-time monitoring of corrosion processes.


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Details

Item Type: University of Pittsburgh ETD
Status: Unpublished
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Jiang, Menghanmej78@pitt.edumej78
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Thesis AdvisorWang, Qing-Mingqiw4@pitt.eduqiw4
Committee MemberBan, Hengheng.ban@pitt.eduheng.ban
Committee MemberZhao, Xiayunxiayun.zhao@pitt.eduxiayun.zhao
Date: 18 June 2019
Date Type: Publication
Defense Date: 4 April 2019
Approval Date: 18 June 2019
Submission Date: 4 April 2019
Access Restriction: 3 year -- Restrict access to University of Pittsburgh for a period of 3 years.
Number of Pages: 68
Institution: University of Pittsburgh
Schools and Programs: Swanson School of Engineering > Mechanical Engineering and Materials Science
Degree: MS - Master of Science
Thesis Type: Master's Thesis
Refereed: Yes
Uncontrolled Keywords: line-focus transducer, ultrasound, corrosion monitoring, Rayleigh wave
Date Deposited: 18 Jun 2019 18:17
Last Modified: 18 Jun 2019 18:17
URI: http://d-scholarship.pitt.edu/id/eprint/36277

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