The electrocrystalliztion nucleation and growth process of Ni-Fe alloy was studied using cyclic voltammetry and chronoamperometry. The results show that, in the case of high deposition overpotential, the nucleation/growth process of Ni-Fe binary alloy is 3-D instantaneous, and the growth rate of the previously formed nuclei increases with overpotential. However, at low overpotential, no distinguished nucleation current can be observed.Meanwhile, the discrepancy between the experimental non-dimensional variables(I/Im)2 and those calculated from the theoretical model was elucidated in the light of the molecular orbital theorem.
This paper examines an analysis method of corrosion surface damage of coating materials by using the digital image processing technology and related theory of colorimetry.The corrosion morphology image acquisition system was established,and was used to capture the corrosion morphology of coating specimens,which were exposed in the field exposure station.To describe the discoloration of corrosion surface damages,the HSV color model was used.The Euclidean distance between uncorroded image and corroded image was extracted as color characteristic parameter.A method for automated identification system of discoloration of corrosion damages was developed based on this analysis,and could be an important step in the direction in corrosion inspection.
