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朴炳玉,崔丙鎭,尹秉河 경북대학교 공과대학 1987 工大硏究誌 Vol.16 No.-
A kinetics study on the corrosion of Fe-Cr alloys in molten aluminium has been made under the static and isothermal conditions. The experiments were carried out at given temperature in the range of 680℃∼800℃. Radius of cylindrical specimen after partial dissolution was calculated from the weight loss of specimen. The results obtained are as follows; The intermetallic compounds on each Fe-Cr alloy is mainly composed of Fe_2Al_5. The corrosion rate, V(㎝/sec), of Fe-Cr alloys in molten aluminium obtained are as follows; Fe-1 Cr; V=0.055 exp(-9545/T) Fe-5 Cr; V=0.122 exp(-10702/T) Fe-9 Cr; V=0.301 exp(-11731/T) Values of activation energy for corrosion are equal to 19∼24Kcal/mole. These results are consistent with a mechanism where the rate-controlling step is the diffusion of Fe atoms through a liquid boundary layer.
무전해도금법에 의한 Co-Mi-P 및 Co-Zn-P 합금도금층의 자기적성질에 미치는 합금성분 및 도금조건의 영향
이종섭,박병옥,윤병하 경북대학교 산업기술연구소 1991 産業技術硏究誌 Vol.19 No.-
Magnetic properties of Co-Ni-P film deposited from the electroless plating bath with pyrophosphate as a complexing agent were investigated. Deposition rate of Co-Ni-P alloy was faster than that of Co-Zn-P alloy. For Co-Ni-P deposits, the coercive force of deposits with thickness of 0.2㎛ was maximum with 910 Oe at 0.1 molar ratio of nickel to cobalt in the bath, and orientation of (100) plane of α-Co was disappeared due to adding nickel in the deposits. For Co-Zn-P deposits, the coercive force of deposits with thickness of 0.2㎛ was maximum with 750 Oe at 0.1 molar ratio of zinc to cobalt in the bath, and orientation of (100) plane of α-Co was weakened due to adding zinc in the deposits. Under the condition of vertical magnetic field, saturation magnetization of 0.1 molar ratio of nickel and zinc to cobalt in the bath was decreased, but that 0.4 molar ration of nickel and zinc to cobalt in the bath was not decreased. Orientation of α-Co was changed from (100) plane to (002) plane due to increasing external magnetic field.