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김만,장도연,이규환,노병호,Kim, Man,Chang, Do-Yon,Lee, Kyu-Hwan,Rho, Byung-Ho 한국기계연구원 1993 硏究論文集 Vol.23 No.-
Photoetching of AISI 304 stainless steel in ferric chloride solution has been studied. This paper investigated on the single side etching characteristics of 304 stainless steel, especially influence of etching temperature, spray pressure of ferric chloride etchant, and etching time with $50\mum$ and $75\mum$ line width photomask.
문성모(Sung-Mo Moon),이상열(Sang-Yeal Lee),이규환(Kyu-Hwan Lee),장도연(Do-Yon Chang) 한국표면공학회 2004 한국표면공학회지 Vol.37 No.6
Fe thin films containing Si particles were prepared on metallic substrates by electrodeposition method in sulfate solutions and the content of codeposited Si particles in the films was investigated as a function of applied current density, the content of Si particels in the solution, solution pH, solution temperature and concentration of FeSO₄7H₂O in the solution. The amount of Si codeposited in the film was not dependent on the applied current density, solution pH and solution temperature, while it was dependent on the content of Si particles in the solution and the concentration of FeSO₄7H₂O in the solution. The amount of Si codeposited in the film increased with increasing content of Si particles in the solution but reached a maximum value of about 6 wt% when the content of Si particles in the solution exceeds 100 g/l. On the other hand, the content of Si codeposited in the film increased up to about 17 wt% with decreasing concentration of FeSO₄7H₂O in the solution. These results would be applied to the fabrication of very thin Fe-6.5 wt%Si sheets for electrical applications.
0.1 M HCl이 포함된 아임계수 및 초임계수 용액에서 Alloy 625의 부식거동
이규환 ( Kyu Hwan Lee ),이무중 ( Moo Joong Lee ),장도연 ( Do Yon Chang ) 대한금속재료학회 ( 구 대한금속학회 ) 2006 대한금속·재료학회지 Vol.44 No.7
Corrosion tests of alloy 625 in subcritical- and supercritical water containing 0.1 M HCI were performed in the range of temperature of 350℃~450℃ at 25 MPa. The corrosion rate of alloy 625 was faster in sub critical water than in supercritical water. 0.1 M of hydrogen peroxide seemed critical concentration of oxidizer that accelerated the corrosion rate of alloy 625. Below 0.1 M of hydrogen peroxide, corrosion rate was not influenced, however, over 0.1 M, corrosion rate was increased rapidly with increasing the hydrogen peroxide. Alloy 625 had two corroded layers. Intermediate layer was the porous structure layer in which Ni and/or Fe were dissolved out selectively. The outer layer was a powder-like porous oxide layer mainly composed with chromium oxide. It was found that the main corrosion mechanisms of alloy 625 were selective dissolution of nickel and iron under the subcritical water and selective dissolution of nickel under the highly oxidized supercritical water condition.