金属とケイ酸塩ガラス融液との分極下における反応について : W, Cr, Fe, SUS 304 および Inconel 600

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In the previous paper, the electrochemical phenomena of Ni and Mo in a molton silicate glass of the composition 16 Na_2o・12CaO・72SiO_2 in wt% were investigated. In this paper, W, Cr, Fe, SUS 304 and Inconel 600 were chosen as the objects to be measured. Anodic dissolution, passivation and cathodic deposition for these metals were investigated by linear potential sweep voltammery at various potential sweep rates (5〜0.05V/sec) with platium reference and auxiliary electrodes in Ar gas atmosphere or in air. Moreover, the metal-glass interface after polarization was analysed by EPMA. On cathodic potential sweep of every metal investigated here, silicate anions were easily reduced to silicon element and a kind of silicade layer covered the elecrtode surface. Since the silicide has high electrical resistance, its formation made the measurement of voltammogram difficult ad slower sweep rates. The anodic voltammogram of W at 3 V/sec showed a large current peak around 1.7 V (relative to Pt reference). The peak potencial shifed to more cathodic direction with decreasing sweep rate. The current peak was attributed to the formation of a passive layer on the W electrode. The occurrence of tungsten oxide layer with 30 μm thick on the W electrode was confirmed by EPMA. The oxide layer seemed to be made up by WO_3. The broad current peak was observed on anodic voltammogram of Cr due to the formation of chromium oxide Cr_2O_3. There was no peak on the anodic current-potential curve for the Fe electrode and Fe dissolved rapidly and easily. Both SUS 304 and Inconel 600 were subject to passivation by oxide film formation of Cr_2O_3 and NiO on anodic polarization.
社団法人日本材料学会の論文
1985-11-15

金属とケイ酸塩ガラス融液との分極下における反応について : W, Cr, Fe, SUS 304 および Inconel 600

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