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Mechanism of LDH Direct Growth on Aluminum Alloy Surface: A Kinetic and Morphological Approach

The growth of ZnAl layered double hydroxide (LDH) on the AA2024 surface was monitored using synchrotron high-resolution X-ray diffraction. Kinetic data were extracted and analysed using the Avrami Erofe’ev kinetic model. Accordingly, the LDH film growth is governed by a 2D diffusion-controlled reaction with a zero-nucleation rate. Additional methods including exsitu AFM/SKPFM supported by in-situ OCP measurements together with SEM and TEM/EDX analysis, provided further insight into the different stages of the mechanism of LDH growth. Prior to the conversion coating formation, an intermediate layer is formed as a basis for the establishment of the LDH flakes. Moreover, a Cu-rich layer was revealed, which could contribute to the acceleration of LDH growth. The formed LDH layer does not show any cracks