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
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 [Formula: see text] 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.