Evaluation of pitting corrosion by dynamic speckle pattern analysis

Omid Pedram, Ramin Jamali, Vahid Abbasian, Vahideh Farzam Rad, Arash Darafsheh, Ramin Khamedi, Esmaeil Poursaeidi, Ali Reza Moradi

Research output: Contribution to journalArticlepeer-review

Abstract

There is an increasing interest in non-destructive and real-time high-resolution approaches for corrosion studies in metals. In this paper, we propose the dynamic speckle pattern method as a low-cost, easy-to-implement, and quasi in-situ optical technique for the quantitative evaluation of pitting corrosion. This type of corrosion occurs in a specific area of a metallic structure and causes holes formation leading to structural failure. A Custom 450 stainless steel sample, placed in 3.5 wt% NaCl solution and applied to a 350mVSCE potential to initiate the corrosion, is used as the sample. The speckle patterns formed by the scattering of a He-Ne laser light is changed over time due to any corrosion in the sample. The analysis of the time-integrate speckle pattern suggests that the growth rate of pitting decreases with time.

Original languageEnglish
Article number8549
JournalScientific reports
Volume13
Issue number1
DOIs
StatePublished - Dec 2023

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