Thermochemics and kinetics of the hot dip galvanizing reaction by electrochemical method.

电化学方法热浸镀锌反应的热化学和动力学。

基本信息

批准号：
06650835
负责人：
YAMAGUCHI Shu
金额：
$ 1.34万
依托单位：
Nagoya Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06650835/
关键词：
Chemical potential Hot dip galvanizing Activity CGL Aluminum Phase stability Phase diagram Phase transformation 溶解亜鉛メッキドロス濃淡電池 Fe Zn

项目摘要

Thermochemical properties of liquid Zn-Al-Fe ternary alloys equilibrated with so-called dross phases, which are solid Fe-Zn and Fe-Al intermetallic compounds, have been made by an emf method using Al concentration cell composed of composite mixed chloride and sodium beta-alumina solid electrolytes.The construction of the cell can be expressed as follows.JA01HYThe emf of the cell is written by the following Nernst's equation.JA02SUThe chemical potential of Al in the alloys has been obtained as a function of temperature from the emf measurements, and the potential diagram has been constructed to illustrate the stability domain of the intermetallic compounds in equilibrium with liquid phses as functions of Al potential and temperature.The present results indicate that the delta+Fe_2Al_5+liq. threephase region, which corresponds to the boundary of the stability domain of delta_1 and Fe_2Al_5, branches into GAMMA_1+Fe_2Al_5+liq. regions at 460ﾟC,suggesting that GAMMA_1 phase becomes stable … More below this temperature. The GAMMA_1 phase showed marked grain growth and the solubility of Al was found to be higher than thatin delta_1 phase. From the comparison of metallographic observation of both GAMMA_1 and delta_1, the present author suggest the mechanism of transformation and growth of GAMMA_1 phase from delta_1 phase. The present observation that the GAMMA_1 phase can coexist with liquid phase was also confirmedby the results that the bottom dross sampled at CGL pot was the single phase of GAMMA_1. Also suggested by the inflection of emt-temperature relationship was the possible existence of the higher order transition in delta_1 phase, which is termed as delta'_1 phase, and the stability domain of delta'_1phase is illustrated in the potential stability diagram. Details of the structural information of this phase, however, is not fully established at this moment. Further discussion has been made based on the compositional analysis of the dross sample by illustrating the isothermal section of the ternary composition phase diagram with the comparison with the previous reports. Based on both potential stability diagram and the composition diagram, experimental results for simultaneous measurement of spatial distribution of both temperature and Al potential in the CGL pot has been analyzed, and the formation mechanism of GAMMA_1 phase in the pot hasbeen discussed in conjunction with the surface damage by the grain-grown dross particles suspended in the molten zine in the pot. Less

液体Zn-All-FE三元合金等于具有所谓的滴灌阶段C化合物的热化学性能是通过EMF方法使用的Al浓度细胞制成的ja01hyhife ja01hythe的EMF由以下s方程式编写。JA02SutheAl在合金中的化学潜力是根据EMF测量的温度而获得的，并且已经构建了电位图，并构建到构建到构造的。与液体phs pothe的液体中的金属合成表示delta+fe_2al_5+liq的稳定域。在Themperature下方，发现AL的溶解度比Delta_1的金属观察到了delta_1阶段的gamma_1和delta_1 ism的溶解度。 γ_1如此确认，在γ_1的CGL阶段采样了底部滴度。 _1偶经在潜在的稳定性图中图和组成结果，用于同时测量CGL锅中的温度和含量的空间分布，并且gamma_1的形成机制已被镀在麦芽粉粒中，与表面损伤相结合，粉的形成机理在麦芽汁的损伤中造成了损害。在锅中