Electrochemical Corrosion Behaviour of Stainless Steels AISI 304 and 316L in Caribbean Sea Water

Abstract:

AISI 304 and 316L flat samples were exposed during 3 months in Carribean sea water.At the end of the experiment E_corr of AISI 316L reached one-half the negative potential value than that of AISI 304. The tendencies of E_corr were correlated with the pitting corrosion development. They could be considered as a consequence of the opposition between the nucleation of new pits and repassivation of active sites. The analysis of E_corr fluctuations was carried out with the potential spectral density (PSD) vs. frequency in logarithmic scale. The decrease of the PSD slopes, exponent b values, indicated a release of spontaneous energy with the advance of pits formation on the stainless steel surface. The data showed that in the range of low frequencies the process that occurs on both stainless steels surfaces could be considered as fractional Brownian motion, an anti-persistent non-stationary process, while in the range of higher frequencies as fractional Gaussian noise, an persistent stationary.

• Periodical: Solid State Phenomena (Volume 227)
• Pages: 95-98
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.227.95
• Online since: January 2015
• Authors: D.M. Herrera-Zamora*, Lucien Veleva, Juan Luis López
• Keywords: Corrosion Potential, Hurst Coefficient, PSD, Sea Water, Stainelss Steel

References

[1] Z. Szklarska-Smialowska, Pitting Corrosion of Metals, NACE International, (1986).

[2] A.S. Mikhailov, J.R. Scully, J.L. Hudson, Nonequilibrium collective phenomena in the onset of pitting corrosion, Surf. Sci. 603 (2009) 1912-(1921).

DOI: 10.1016/j.susc.2008.08.045

[3] C. Punckt, M. Bölscher, H.H. Rotermund, et al., Sudden onset of pitting corrosion on stainless steel as a critical phenomena, Science 305 (2004) 1133-1136.

DOI: 10.1126/science.1101358

[4] P. Roberge, Handbook of Corrosion Engineering, The McGraw-Hill Companies, N.Y., (2000).

[5] A.J. Sedriks, Corrosion of Stainless Steels, 2nd edition, J. Wiley & Sons, Inc., New York, (1996).

[6] J.R. Kearns, J.R. Scully, P.R. Roberge, et al., Electrochemical Noise Measurement for Corrosion Applications, ASTM, STP 1277, West Conshohocken, PA, 1996, p.463.

[7] B.B. Mandelbrot, J.W. van Ness, Fractional Brownian Motion, Fractional Noises and Applications, SIAM Review, Vol. 10, no. 4, 1968, pp.422-437.

DOI: 10.1137/1010093

[8] A. Eke, P. Herman, J.B. Bassingthwaighte, et al., Physiological time series: Distinguishing Fractal Noise from Motions, Pflügers Archives 439 (2000) 403-415.

DOI: 10.1007/s004249900135

[9] E.H. Hurst, Methods of Using Long-term Storage in Reservoirs, Proceedings, Institute of Civil Engineering, Vol. 5, no. 5 part 1, 1956, pp.519-591.

[10] D. Delignieres, S. Randani, L. Lemoine, K. Torre, M. Fortes, G. Ninot, Fractal analyses for short, time series: A re-assessment of classical methods, J. of Mathematical Psychology 50 (2006) 525-544.

DOI: 10.1016/j.jmp.2006.07.004