18 Feasibility of Using Fringe Projection System for Corrosion Monitoring in Metals of Interest in Cultural Heritage 115 Fig. 18.5 Difference between the Fourier transforms recorded at 0 h and 110 h Fig. 18.6 Optical macrographs of sample corroded 20 h (a), and 110 h in synthetic rain (b) it can be seen the surface of sample is corroded in both cases, especially after 110 h, and the morphologies of the corrosion products are different. On the sample after 20 h some almost perfectly tetragonal crystals can be observed while, on the sample after 110 h it was observed a uniform patina and a preferential corrosion in some areas which correspond to Cu-rich dendrites [43]. In addition, to have information on the general corrosion process the corrosion rate was measured. Corrosion rate calculated using the average weight loss of sample exposed to synthetic rain is shown in Fig. 18.8. The analyses performed on the bronze sample showed that corrosion rate linearly increases with increasing exposure time. This is in full agreement with the sample macrographs observed before.
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