すきま再不動態化電位の自動化測定

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  • Development of Microcomputer Systems to Measure Repassivation Potential for Crevice Corrosion
  • スキマ サイ フドウタイカ デンイ ノ ジドウカ ソクテイ

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説明

Repassivation potential, ER, could be regarded to be well reproducible crevice characteristic which cover repassivation as well as initiation of crevice corrosion as reported in our previous papers. The cyclic polarization procedure to determine ER has to be conducted under sufficiently slow rates of potential sweep and requires a long time. This paper describes the development of two automatic data acquisition and control systems for ER measurement which can eliminate disadvantages of manual operations which are laborious and tedious. The system A has microcomputer, PS-80 (TEAC), with digital magnetic tapes, A/D and D/A converters, printer and real time clock (RTC) to control 3 potentiostats. The system B has single boad computer, TK-85 (NEC), with A/D and D/A converters, miniprinter and RTC to control 2 potentiostats. ER values obtained by the systems A and B for a nut/nut-crevice of Type 316 steel in 3% NaCl solution at 25°C measured -0.29N--0.30V, SCE which coincided with those manually determined as reported earlier. Those systems were also applied to crevices of Type 444 steel. Each system has been running for more than 5 months.

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