Based on the light scattering theory of Kirchoff approximation, the correlation function of the speckle intensities relating to that of the random surfaces is quantitatively formulated in correspondence with the principles of Van Cittert-Zernike theorem. We then propose the method for the extraction of surfaces parameters from the correlation functions of speckles intensity produced by light scattering in the region near the random surfaces. The experiments of light scattering in the region near random self-affine fractal surfaces are simulated, and the 3 parameters, i.e., the roughness w, the lateral correlation length ξ and the roughness exponent α, are extracted by fitting the correlation function data of the speckle intensities to the formulated expression. The extracted values of the surface parameters conform well with the set values.
After phosphatising disposal, the micro-morphology of the AZ31B sheet was observed. The contact angle of the sheet was measured. The surface energy of the sheet was calculated. The laminated sheet was prepared, with preliminary study of its performance. Results showed that the amount and grain size of phosphate were influenced by the phosphating process, as well as wettability of materials. After 30°C/5 min phosphating, a dense phosphating film consisting of zinc phosphate was obtained, and the advancing contact angle of magnesium alloy was 58.3°. Compared with 31.5 mN m−1 of the raw magnesium alloy sheet, the surface energy of the sheet after phosphating reached 90 mN m−1. The laminated sheet of fibre/resin–phosphated magnesium alloy–fibre/resin has good bonding interface, corrosion resistance and mechanical properties.
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