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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
PubMed
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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.

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  • 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.