고속회전체용 스테인리스강의 플라즈마이온질화 기술을 적용한 부식 및 캐비테이션-침식 저항 향상
Improvement of corrosion and cavitation-erosion resistance of stainless steels using plasma ion nitriding for high-speed rotating components
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다양한 온도에서 플라즈마이온질화 처리된 304 스테인리스강에 대해 정적 및 캐비테이션 환경 하에서 전기화학적부식 실험을 통해 부식과 캐비테이션-침식 손상 메커니즘을 규명하였다. 플라즈마이온질화는 25% 질소와 75% 수소의가스비에서 공정 온도 350 ∼ 500 ℃에서 10시간동안 실시하였다. 부식 정전류 실험은 5 × 10-3 ~ 1 × 10-1 A/cm2의 범위에서 3,600초 동안 실시하였다. 정전류-캐비테이션 실험은 30㎛의 진폭, 해수온도 25 °C에서 실시하였으며, 혼 팁과 시편표면 사이의 거리는 1 mm를 유지하였다. 정적 조건에서는 450 ℃, 캐비테이션 조건에서는 350 ~ 400 ℃에서 다른 공정온도 조건에 비해 상대적으로 적은 부식 및 캐비테이션-침식 손상이 관찰되었다.
Abstract
The corrosion mechanism of plasma ion nitrided 304 stainless steel was investigated by a corrosion test with current density variables under a static and cavitation environment. Plasma ion nitriding was performed in a gas mixture of 25% nitrogen and 75% hydrogen from 350 to 500 °C for 10 h. A galvanostatic experiment was carried out at 25 °C in natural seawater in the range of 5 × 10-3 to 1 × 10-1 A/cm2 for 3,600 s. In addition, a cavitation-galvanostatic experiment, which provided a kinetic condition, was performed at a distance of 1 mm between the horn tip and specimen surface, and with an amplitude of 30 ㎛. Relatively little corrosion damage was observed at 450 °C under static conditions and at 350 ~ 400 °C under cavitation conditions, compared with other temperature conditions.
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