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Effects of Copper on the Corrosion Properties of Low-Alloy Steel in an Acid-Chloride Environment
장영욱,홍지현,김정구 대한금속·재료학회 2009 METALS AND MATERIALS International Vol.15 No.4
The influence of Cu addition on the corrosion resistance of low-alloy steel in an acid-chloride solution was investigated by electrochemical methods, such as potentiodynamic polarization tests and an electrochemical impedance spectroscopy (EIS). The XPS analysis of the corroded surfaces indicated the formation of protective Cu2O and Cu(OH)2 layers on the surface. The formation of Cu products on the surface reduced the uniform corrosion rate of the steel, but promoted localized corrosion due to the galvanic interaction between the covered areas of copper oxide/hydroxide and the uncovered areas on the surface of steel. The influence of Cu addition on the corrosion resistance of low-alloy steel in an acid-chloride solution was investigated by electrochemical methods, such as potentiodynamic polarization tests and an electrochemical impedance spectroscopy (EIS). The XPS analysis of the corroded surfaces indicated the formation of protective Cu2O and Cu(OH)2 layers on the surface. The formation of Cu products on the surface reduced the uniform corrosion rate of the steel, but promoted localized corrosion due to the galvanic interaction between the covered areas of copper oxide/hydroxide and the uncovered areas on the surface of steel.
유기용제가 무정형 폴리에스테로공중합체의 물성에 미치는 영향
장영욱,조희민 한국공업화학회 1999 응용화학 Vol.3 No.1
A study has been carried out to see the effect of solvent sorption on the mechanical properties of amorphous copolyesters. Sorption and desorption curves indicated that, among the solvents investigated, N,N-dimethylformamide(DMFA) was sorbed greatly by the copolyesters. The effect of solvent environments on the mechanical properties of amorphous copolyesters have been studied by means of the tensile test. From the mechanical behaviour of copolyesters before and after sorption, we found that change of the mechanical properties of copolyesters is explained on the basis of the plasticization, solvent induced crystallization, surface cavitation, and chemical attack.
Jews and Koreans in the USSR: Patterns after the Dissolution of the Soviet Union
장영욱 전남대학교 글로벌디아스포라연구소 2019 디아스포라 연구 Vol.13 No.2
This paper seeks to find the reasons for the contrast migration behaviours of two remarkably similar ethnic groups, Soviet Jews and Soviet Koreans. Mill’s Method of Difference is adopted to analyse the differences between these two groups. While as many as 600,000 Soviet Jews went to their newly founded national state, Israel, during the post-Soviet transition period, few Soviet Koreans left for Korea which was then equally advanced as Israel in terms of economic growth. After exploring the similar push and pull factors faced by both peoples, three possible explanations for their different repatriation patterns, namely income differentials, migrant network, and repatriation policy, are suggested. Economic concerns did trigger the mass migration of Soviet Jews but given that the Koreans had similar economic benefits of emigration, the role of economic factors may have been limited. A formerly established community of immigrants from the Soviet Union in Israel and the unique repatriation policy represented by the Law of Return and “absorption baskets” appear to have exerted a bigger influence on decisions of prospect migrants. The impact of these two factors is made more convincing because Korea had neither previous migrant stock from the former Soviet Union countries nor the policies to attract their compatriots abroad.