Corrosion study in TbFeCoCr amorphous magneto-optical films |
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Authors: | Kobayashi H Ogino K Takayama S |
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Affiliation: | IBM Japan, Kanagawa; |
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Abstract: | (Tb20Fe65Co15)94Cr 6 film shows high corrosion resistance with good magnetooptical properties, Hc=4.9 kOe, &thetas;k=0.3°, Ku=1.4×106 erg/cm3 and Tc=230°C. Pit corrosion in 1N-NaCl aqueous solution and wet corrosion in 85°C and 85%RH atmosphere were studied for TbFeCo films with and without Cr addition. It is suggested that pit corrosion occurs by a chemical reaction between the anodic pit wall and the cathodic film surface, resulting in a piling up of corroded products inside the pits. On the other hand, wet corrosion in TbFeCo and TbFeCoCr films shows a bubble-chain-like morphology similar to conventional filiform corrosion observed in a coated film. This seems to take place by discontinuous movement of the anodic reaction area ahead of the bubbles |
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