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The analysis of multifractal time series (MFDFA) has been carried out for copper patina corrosion potential Ecorr fluctuations in the period of 10 days, when flat samples were immersed in Caribbean sea water. The results showed that there are ranges of 5-sizes for potential signals and q-order fluctuations, where Fq (s) exhibits a power law behavior. The Hurst exponent h(q) values, the nonlinear multifractal spectrum T(q) and the shape of the singularity spectrum f(a) confirmed that Ecorr series of copper exposed in sea water are compatible with a multifractal behavior. The tendencies of Ecorr change were correlated with the copper ions release (runoff) during dissolution of corrosion products in sea water and with the significant transformation in the copper patina (Cu2O) composition as time of corrosion process advanced.
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López et al. (2014) studied this question.
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