슈퍼오스테나이트 스테인리스강의 해수환경에서 온도에 따른 전기화학적 특성
Electrochemical Characteristics of Superaustenitic Stainless Steel with Temperature in Sea Water
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In this investigation, the electrochemical characteristics of superaustenitic and general austenitic stainlesssteels were compared by conducting potentiodynamic polarization experiment with varying temperaturesin natural seawater solution. From the result of the potentiodynamic polarization experiment, the corrosionrate of UNS S31603 was found to be 17 times faster than that of UNS N08367 under the most severe corrosionconditions. The relationship between the corrosion rate by maximum damage depth and the corrosionrate by the corrosion current density was expressed as α value for each stainless steel. The α value ofUNS S31603 under all temperature conditions was higher than that of UNS N08367 under similar conditions. This means that UNS S31603 is more prone to localized corrosion than UNS N08367. UNSS31603 expressed pitting type damages under all temperature conditions as shown by SEM analysisresults. The pitting damage rapidly grew at the relatively poor grain boundaries. Damage on UNS N08367was not clearly represented at 30 oC and 60 oC, and slight intergranular corrosion damage was observed onthe entire surface at 90 oC.
Abstract
In this investigation, the electrochemical characteristics of superaustenitic and general austenitic stainlesssteels were compared by conducting potentiodynamic polarization experiment with varying temperaturesin natural seawater solution. From the result of the potentiodynamic polarization experiment, the corrosionrate of UNS S31603 was found to be 17 times faster than that of UNS N08367 under the most severe corrosionconditions. The relationship between the corrosion rate by maximum damage depth and the corrosionrate by the corrosion current density was expressed as α value for each stainless steel. The α value ofUNS S31603 under all temperature conditions was higher than that of UNS N08367 under similar conditions. This means that UNS S31603 is more prone to localized corrosion than UNS N08367. UNSS31603 expressed pitting type damages under all temperature conditions as shown by SEM analysisresults. The pitting damage rapidly grew at the relatively poor grain boundaries. Damage on UNS N08367was not clearly represented at 30 oC and 60 oC, and slight intergranular corrosion damage was observed onthe entire surface at 90 oC.
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