Numerical reconstruction of digital holograms for the study of pitting dynamic processes of the X70 carbon steel in NaCl solution

In this paper, a new image processing method to reconstruct digital holograms is proposed. After the digital holograms were recorded in situ during the electrochemical experiment, three-dimensional images were numerically reconstructed to study pitting dynamic processes of the X70 carbon steel in neutral solution containing chloride ions. Compared with the digital holograms, the reconstructed images can capture subtle changes more readily, therefore, more revealing. The radii of the pits were different, for they were induced at different times and propagated at different rates. It is expected that this method can be used extensively in studying the electrochemical dynamic processes at the electrode/electrolyte interface.