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Two-dimensional quantification of the corrosion process in metal surfaces using digital speckle pattern
N Andrés1, J Lobera, M P Arroyo
1Instituto de Investigación en Ingeniería de Aragón (I3A), Universidad de Zaragoza, c/ Pedro Cerbuna 12, 50009 Zaragoza, Spain. nandres@unizar.es
Applied Optics
|April 5, 2011
Summary
Digital speckle pattern interferometry (DSPI) effectively analyzes surface corrosion. This technique provides quantitative corrosion rates comparable to traditional methods and allows for regional analysis of corrosion evolution.
Area of Science:
- Materials Science
- Electrochemistry
- Optical Metrology
Background:
- Corrosion monitoring is crucial for material integrity.
- Traditional methods like weight loss offer bulk measurements.
- Non-destructive, quantitative surface analysis techniques are needed.
Purpose of the Study:
- To evaluate the applicability of digital speckle pattern interferometry (DSPI) for analyzing surface corrosion.
- To develop a quantitative analysis process for corrosion using DSPI.
- To compare DSPI results with established corrosion measurement techniques.
Main Methods:
- Immersion of an iron (Fe) surface in sulfuric acid.
- Application of digital speckle pattern interferometry (DSPI) to monitor surface changes.
- Quantitative analysis of interferometric data to determine corrosion rates.
- Comparison of DSPI-derived corrosion rates with weight loss measurements.
Main Results:
- DSPI successfully monitored the evolution of surface corrosion on an Fe sample.
- Quantitative corrosion rates were obtained using DSPI analysis.
- DSPI results showed good agreement with the weight loss method.
- Two-dimensional analysis enabled regional assessment of corrosion rates across the surface.
Conclusions:
- DSPI is a viable technique for quantitative analysis of surface corrosion processes.
- DSPI offers advantages in providing detailed, regional corrosion information.
- The developed analysis process allows for accurate corrosion rate determination.
