Papers by Keyword: Alloy Layer

Abstract: Development process of Hot-dip galvanizing technology and characteristics of different production methods were reviewed in this paper. Presently, the UEC method was utilized widely because of its advantages like high output, high quality, energy saving, lower consumption and low products cost. To improved the corrosion resistance of the coating and declining the cost of hot-dip galvanizing, hot-dip galvanizing alloyed coating has been developed. Although the general hot-dip galvanizing has been developed rapidly in China, we should make great efforts to research deeply and improve the hot-dip galvanizing technology, especilly in the areas such as zinc alloy plating and the corresponding hot-dip galvanizing technology.

Abstract: Prepare Ni60A on the H13 steel matrix in thermal spraying. Then, the alloy layer is treated with electron beam in multichannel lapping. Microstructure, the direction of grain growth, the situation of crack initiation on surface modification are analyzed and researched by optical microscope,electron scanning microscope,energy disperse spectroscopy. Experimental results show that the alloy layer which is scan with an electron beam is fuse together with the steel matrix. The organizations of the strengthened layer are dendritic crystal and columnar crystal. Moreover, the grain refinement is well done. Some microcosmic or macroscopic crack appear in the scan regions.

Abstract: The electrochemical behavior of electrolytic tinplates was studied and analyzed by means of electrochemical methods together with tin quantity test and scanning electron microscopy (SEM). The results indicated that the properties of the Sn-Fe alloy layer determined the electrochemical behavior of electrolytic tinplates. The electrolytic tinplate possessed higher corrosion resistance if the Sn-Fe alloy layer was thicker and more compact.

Abstract: In this article, the effects of galvanizing process parameters, especially cooling rate, on the microstructures of coating was investigated. The microstructures of Al-Zn-Si coating were analyzed by the following methods: surface microstructure, cross-section microstructure, thickness and composition of alloy layer by SEM and its accessories, distribution of each element along depth by glow-discharge emission spectrometer, micro-area elemental distribution image analysis of each element distribution on surface and cross-section by electron probe, crystallization orientation by X-ray diffraction instrument. The results showed that coating was made up of aluminum-rich dendrite, interdendritic zinc-rich phase and alloy layer, that cooling rate affected depth of alloy layer in Al-Zn-Si coating directly, that zinc concentrated in the surface layer of coating and silicon in the alloy layer, while the coating has larger depth it also concentrated in the surface layer, that aluminum-rich dendrite has preferred orientation in the solidification process.

Abstract: The effect of different electric pulse parameters which include capacitance, voltage, frequency and treating time on the hot galvanizing coatings was studied through orthogonal test of array L25. For each factor, five levels were chosen to cover the experimental region. Results showed that the thicknesses of ally layer with different parameter were all reduced. It is from 63.57μm to 28.49μm. The intuition analysis of orthogonal test derived that the pulse capacitance had the most significant influence on the growth of alloy layer, and the influence of other factors was little. The optimum parameter combination were the capacitance of 200μF , the voltage of 700V, the pulse frequency of 4 Hz, and the treating time of 30 s.