Fast visualization of corrosion processes using digital speckle photography

This work shows the feasibility of using non-intrusive optical techniques to determine surface changes associated with corrosion processes even when they are very small and to obtain complementary information to the conventional electrochemical measurements. These techniques have been applied to the study of iron samples in H2SO4 corrosive solutions with different concentrations. Corrosion rate values have been estimated from the polarisation and Tafel curves obtained by linear sweep voltammetry. These measurements have been correlated with the surface changes determined from Digital Speckle Photography. This technique also provides a local 2D information about the evolution of the corrosion process at each surface position.

[1]  R. Sirohi.  Speckle Metrology , 1993, Optical Methods of Measurement.

[2]  Feng Jin,et al.  Quantitative evaluation of corrosion by a digital fringe projection technique , 1999 .

[3]  A. E. Ennos,et al.  Displacement Measurement from Double-exposure Laser Photographs , 1972 .

[4]  M. P. Arroyo,et al.  Digital speckle-pattern interferometry as a full-field fluid-velocimetry technique. , 1999, Optics letters.

[5]  M. Takeda,et al.  Fourier-transform method of fringe-pattern analysis for computer-based topography and interferometry , 1982 .

[6]  K Wolff,et al.  Corrosion monitoring with speckle correlation. , 1999, Applied optics.

[7]  Roland Meynart.  Equal velocity fringes in a Rayleigh-Benard flow by a speckle method. , 1980, Applied optics.

[8]  R. Alfano,et al.  Nondestructive evaluation of incipient corrosion in a metal beneath paint by second-harmonic tomography. , 2000, Optics letters.

[9]  Thomas Fricke-Begemann,et al.  Measurement of random processes at rough surfaces with digital speckle correlation. , 2004, Journal of the Optical Society of America. A, Optics, image science, and vision.

[10]  C. Schroer.  Analysis of locally starting corrosion phenomena using mass change measurements , 2006 .

[11]  W. Smyrl,et al.  Microvisualization of Corrosion , 1995 .

[12]  Pramod Rastogi,et al.  Digital Speckle Pattern Interferometry and Related Techniques , 2000 .

[13]  Klaus D. Hinsch,et al.  Detection of surface microstructure changes by electronic speckle pattern interferometry , 1997 .

[14]  J. Dainty.  Laser speckle and related phenomena , 1975 .

[15]  Klaus D. Hinsch,et al.  Speckle correlation for the analysis of random processes at rough surfaces , 2000 .

[16]  Fu-Pen Chiang,et al.  ESPI and Digital Speckle Correlation Applied to Inspection of Crevice Corrosion on Aging Aircraft , 1998 .