Abstract
A novel light scattering technique for mapping metal surface corrosion is presented and its results on copper exposed to atmosphere are reported. The front end of the instrument is made up of a sensor module comprising a thin beam light emitting diode (LED) illuminating a small spot on the metal surface, and a matched pair of photodetectors, one for capturing the reflected light and the other for sampling the scattered light. The analog photocurrent signals are digitized and processed online by a personal computer (PC) to determine the corrosion factor defined in terms of the two current values. By scanning the sample surface using the light beam and by computing the corrosion factor values simultaneously, a three dimensional graph and a two dimensional contour map are generated in the PC using Matlab tools. The values of the corrosion factor measured in different durations of exposure to atmosphere, which obey a bilogarithmic law, testify to the validity of our mathematical model.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Cramer, S.D., Covino, B.S.Jr. (Eds.), 2003. Corrosion Fundamentals, Testing and Protection. ASM Handbook, Volume 13A. ASM International, New York.
Degueldre, C., Prey, S.O., Francioni, W., 1996. An inline diffuse reflection spectroscopy study of the oxidation of stainless steel under boiling water reactor conditions. Corr. Sci., 38:1763–1782.
El-Mahdy, G.A., 2005. Atmospheric corrosion of copper under wet/dry cyclic conditions. Corr. Sci., 47(6):1370–1383. [doi:10.1016/j.corsci.2004.07.034]
Fitzgerald, K.P., Nairn, J., Atrens, A., 1998. The chemistry of copper patination. Corr. Sci., 40(12):2029–2050. [doi:10.1016/S0010-938X(98)00093-6]
Fonseca, I.T.E., Picciochi, R., Mendonca, M.H., Ramos, A.C., 2004. The atmospheric corrosion of copper at two sites in Portugal: a comparative study. Corr. Sci., 46(3):547–556. [doi:10.1016/S0010-938X(03)00176-8]
Franey, J.P., Davis, M.E., 1987. Metallographic studies of the copper patina formed in the atmosphere. Corr. Sci., 27(7):659–668. [doi:10.1016/0010-938X(87)90048-5]
Mansfeld, F., Tsai, S., 1980. Laboratory studies of atmosphere corrosion—weight loss and electro chemical measurements. Corr. Sci., 20(7):853–872. [doi:10.1016/0010-938X(80)90119-5]
Marcus, P., 2002. Corrosion Mechanisms in Theory and Practice. Marcel Dekker Inc., New York.
Roberge, P.R., 1999. Hand Book of Corrosion Engineering. McGraw Hill Professional, New York, p.10–55.
Salnick, A., Faubel, W., Klewe-Nebenius, H., Vendl, A., Ache, H.J., 1995. Photothermal studies of copper patina formed in the atmosphere. Corr. Sci., 37(5):741–767. [doi:10.1016/0010-938X(95)80006-9]
Shanly, C.W., Hummel R.E., Verink, E.D.Jr., 1980. Differential reflectometry of corrosion products of copper. Corr. Sci., 20(4):481–487. [doi:10.1016/0010-938X(80)90065-7]
Urban, F.K.III, Hummel, R.E., Verink, E.D.Jr., 1982. Differential reflectometry of thin film metal oxides on copper, tungsten, molybdenum and chromium. Corr. Sci., 22(7):647–660. [doi:10.1016/0010-938X(82)90045-2]
Veleva, L., Tomas, S.A., Marin, E., Cruz-Orea, A., Delgadillo, I., Alvarado-Gil, J.J., Quintana, P., Pomes, R., Sanchez, F., Vargas, H., et al., 1997. On the use of the photoacoustic technique for corrosion monitoring of metals: Cu and Zn oxides formed in tropical environments. Corr. Sci., 39(9):1641–1655. [doi:10.1016/S0010-938X(97)00066-8]
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Paulvanna Nayaki, M., Kabilan, A.P. Atmospheric corrosion mapping of copper surfaces from diffuse light scattering measurements by an optoelectronic sensor system. J. Zhejiang Univ. Sci. A 10, 613–618 (2009). https://doi.org/10.1631/jzus.A0820107
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1631/jzus.A0820107