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고분자 전해질 연료전지 양극 작동 환경에서 실험 시간 및 작동 전압 변수에 따른 316L 스테인리스강의 전기화학적 특성과 손상 거동

Electrochemical Characteristics and Damage Behavior in Cathode Operating Conditions of 316L Stainless Steel with Test Time and Applied Potential in Metallic Bipolar Plates for PEMFC

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주제분류금속공학

초록

In this investigation, electrochemical characteristics and damage behavior of 316L stainless steel polymerelectrolyte membrane fuel cell(PEMFC) were analyzed by potentiodynamic and potentiostatic tests in cathodeoperating condition of PEMFC. As the result of potentiodynamic polarization test, range of passiveregion was larger than range of active region. In the result of potentiostatic test, damage depth and width,pit volume, and surface roughness were increased 1.57, 1.27, 2.48, and 1.34 times, respectively, at 1.2 Vcompared to 0.6 V at 24 hours. Also, as a result of linear regression analysis of damage depth and widthgraph, trend lines of damage depth and width according to applied potentials were 16.6 and 14.3 timeslarger, respectively. This demonstrated that applied potential had a greater effect on pitting damage depthof 316L stainless steel. The damage tendency values were 0.329 at 6 hours and 0.633 at 24 hours withapplied potentials, representing rapid growth in depth direction according to the test times and appliedpotentials. Scanning electron microscopy images revealed that surface of specimen exhibited clear pittingdamage with test times and applied potentials, which was thought to be because a stable oxide film wasformed by Cr and Mo.

Abstract

In this investigation, electrochemical characteristics and damage behavior of 316L stainless steel polymerelectrolyte membrane fuel cell(PEMFC) were analyzed by potentiodynamic and potentiostatic tests in cathodeoperating condition of PEMFC. As the result of potentiodynamic polarization test, range of passiveregion was larger than range of active region. In the result of potentiostatic test, damage depth and width,pit volume, and surface roughness were increased 1.57, 1.27, 2.48, and 1.34 times, respectively, at 1.2 Vcompared to 0.6 V at 24 hours. Also, as a result of linear regression analysis of damage depth and widthgraph, trend lines of damage depth and width according to applied potentials were 16.6 and 14.3 timeslarger, respectively. This demonstrated that applied potential had a greater effect on pitting damage depthof 316L stainless steel. The damage tendency values were 0.329 at 6 hours and 0.633 at 24 hours withapplied potentials, representing rapid growth in depth direction according to the test times and appliedpotentials. Scanning electron microscopy images revealed that surface of specimen exhibited clear pittingdamage with test times and applied potentials, which was thought to be because a stable oxide film wasformed by Cr and Mo.

참고문헌 (32)

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