Electrodeposition Amorphous CoB Alloy Technology

CoB alloys have excellent mechanical, chemical and physical capabilities, which have been applied widely and paid much attention by material researchers in recent years. CoB alloys prepared from aqueous solution is developing to the amorphization of microstructure and low-dimenlization of size, in order to optimize their capabilities. In this thesis, CoB alloys were prepared by electrodeposition from aqueous solution.The thesis consists of six chapters. In chapter one we briefly introduce the characteristics,types,preparations,history,formation and value of amorphous alloys. In chapter two we introduce the primary theory of electrodeposition. In chapter three the flow of experiment is given.The contents of chapter four and chapter five are mainly our work. In chapter four a proposal was designed as follows. To begin with, trial and error method was used to decide the solution composition. In the second place, with deposition rate as evaluation criteria, the optimized process formula of CoB electrodeposit were ascertained by orthogonal test. In addition, the influences of change of each component's concentration, pH value, temperature, electric current density on deposition rate were discussed. After a series of experiments, the deposition rate reached 10mg/h·cm~2. The surface of the as-plated films is bright. The adhesion of the films on the substrate is high.In chapter five, the amorphous structure, surface morphology can be characterized by XRD, SEM, STM. The X-ray diffraction proves that the structure of deposit is amorphous. SEM study shows that the deposits are even, dense and cystiform cells. STM was applied to observe the more small scale. From the results, compared with the similar investigations of the others', the grow mode and conglobation structure of the coating are discussed in my own way.In chapter six, a summary of the work and a outlook of this topic are given.