신광선 교수

Up to the date of writing this article, a quantitative analysis between corrosion rate and combined microstructural parameters including composition, grain size, and precipitations has not been reported. Hence, a literature review was carried out on these parameters to understand the quantitative effect of each one on the corrosion rate of Mg and Mg alloys. Moreover, using the available data in the literature and several experimental results, a new model was developed to predict the corrosion ra

The effects of different elements including Al, Sn and Zn with ability of solution hardening on corrosion behavior of a Mg alloy have been studied. The microstructure was analyzed and the electrochemical and immersion techniques were used for corrosion studies. Scanning kelvin probe force microscopy (SKPFM) was utilized to analyze the volta-potential distribution on the surface. It was found that all additives reduced the corrosion resistance; however, Zn decreased the corrosion resistance less

This review highlights the recent advancements in Mg research in South Korea with a prime focus on high-speed-extrudable Mg–Bi-based alloys for high productivity and strength, innovative techniques utilizing {10–12} twinning for improved mechanical properties, and alloying and processing methods for enhanced corrosion resistance. High-alloyed Mg–Bi-based alloys possess thermally stable α-Mg matrix and secondary phase, which ensures high-speed extrusion of these alloys at elevated temperatures wi

This study offers comprehensive data on the turnover of legislators in the fifty U.S. states for the past four-and-one-half decades. The data show that turnover rates vary substantially among the states over this long period of time; however, the general trend is for turnover to have decreased in recent years. A breakdown is offered of various legislative institutional types, including not only the familiar dichotomy between the senates and the houses but also distinctions between staggeredand n