Mechanical Galvanized Shaped Layer Mechanism

Mechanical plating, a kind of "green technology" in surface engineering, made its debut in about 20 years ago. With many characteristics such as low in zinc and energy cost, free from pollution and hydrogen embrittlement, uniform in coatings, it has been attached increasing importance by the developed countries. But the development of mechanism of mechanical deposited coating is far behind that of process of mechanical plating, which cause blind manufactural application of mechanical plating and hinder its development and appliance.In allusion to these facts, this thesis, starting with process of mechanical plating, and in reference to the theories about physics, chemistry and metallurgy, the process of mineral whetting, mill running and the physical chemistry about mechanical alloying, analyzed the mechanism of the formation of mechanical deposited coating.Using the modern analyzing methods such as SEM,X-ray diffraction, the state of zinc powder in mechanical plating liquid, the separating and congregating process of zinc powder and the law of zinc powder deposition are observed. The mutual effect between zinc powder, glass beads, articles, and plating slurry are analyzed in this thesis, the law of adsorption-deposition of metal powder, the function of surfactant and theoretical explanation about them are also included, which end the era of simple explanation about the process of formation of mechanical deposited coating.In this thesis, the distortion degree of zinc powder grain was tested. After the critical shearing stress analysis, the reciprocity discussion between machine and zinc powder, the distortion rule of mechanical deposited coating and the distortion mechanism of zinc grain were concluded.In this thesis, the anti-corrosion performance, the bonding strength and porosity were studied. The shape and position of zinc powder grain in coating were observed and studied through SEM, OM. The chemical composition of coating surface, artic surface and mesosphere were stated and analyzed. At the same time, the structure model was also built up in this thesis.In this thesis, the author queried the definition of mechanical plating and redefined the conception of mechanical plating according to the mechanism of the formation of mechanical deposited coating. Thus, the procedure of mechanical plating was attached to a reasonable subject.Because of the particularity and complexity in observing the phenomenon of adsorbing-depositing, there are still some problems waiting for further study. It's my hope that the results concluded in this thesis could consummate the mechanism of mechanical plating and promote its application and development.