일반적으로 탄소강은 부식에 대한 구조물의 성능을 확보하기 위하여 도장을 통하여 내구성을 확보한다. 하지만 도막열화가 발생하거나 도장이 없는 강재의 경우 부식으로 인한 강재의 단면손실이 발생하게 된다. 탄소강과 비교하여 내후성강재는 표면에 형성된 녹 층을 통하여 강재부식 발생속도를 제한함으로써 강재 내구성을 확보하게 되나, 부식 환경에 따라 발생하게 되는 표면 녹 층에 따라 부식손상 다르게 나타날 수 있다. 본 연구는 구조용 강재로 사용되고 있는 탄소강과 내후성강의 부식저항성능과 손상수준을 비교 평가하기 위하여 염수분무, 건조 및 습윤 상태를 모사한 실내부식실험을 실시하였다. 탄소강과 내후성강의 녹 층 형성과정과 녹 안정화 과정이 다르므로 강재 표면에 생성된 부식생성물의 조성성분 및 미세구조를 분석하였다. 또한 강종에 따른 부식감소량과 부식생성물 두께와의 상관관계를 검토하고, 부식생성물 두께에 따른 부식감소량 추정식을 제시하였다.
일반적으로 탄소강은 부식에 대한 구조물의 성능을 확보하기 위하여 도장을 통하여 내구성을 확보한다. 하지만 도막열화가 발생하거나 도장이 없는 강재의 경우 부식으로 인한 강재의 단면손실이 발생하게 된다. 탄소강과 비교하여 내후성강재는 표면에 형성된 녹 층을 통하여 강재부식 발생속도를 제한함으로써 강재 내구성을 확보하게 되나, 부식 환경에 따라 발생하게 되는 표면 녹 층에 따라 부식손상 다르게 나타날 수 있다. 본 연구는 구조용 강재로 사용되고 있는 탄소강과 내후성강의 부식저항성능과 손상수준을 비교 평가하기 위하여 염수분무, 건조 및 습윤 상태를 모사한 실내부식실험을 실시하였다. 탄소강과 내후성강의 녹 층 형성과정과 녹 안정화 과정이 다르므로 강재 표면에 생성된 부식생성물의 조성성분 및 미세구조를 분석하였다. 또한 강종에 따른 부식감소량과 부식생성물 두께와의 상관관계를 검토하고, 부식생성물 두께에 따른 부식감소량 추정식을 제시하였다.
Carbon steel for steel structures can be ensured its durability from paint coating to maintain the structural performance of the structure against corrosion. However, in the case of steel with paint coating deterioration or unpainted, sectional loss of steel member can be occurred by corrosion probl...
Carbon steel for steel structures can be ensured its durability from paint coating to maintain the structural performance of the structure against corrosion. However, in the case of steel with paint coating deterioration or unpainted, sectional loss of steel member can be occurred by corrosion problem. Compared with carbon steel, weathering steels ensures its durability from limiting the corrosion rate of the steel determined by corrosion rust layer. However, its corrosion damage can be different depending on the surface rust layer generated by the corrosion environment. In this study, therefore, accelerated corrosion test were carried out to evaluate corrosion resistance and damage level of carbon steel and weathering steel for steel structures. The composition and micro structure of the corrosion products formed on the surface of the steel were analyzed, since the process of forming the rust layer and the stabilization of the rust of carbon steel and weathering steel were different. Also, correlation between the amount of corrosion loss and the thickness of corrosion products according to the steel type was examined and the estimation equation of corrosion loss for structural steel was presented based on the thickness of the corrosion product.
Carbon steel for steel structures can be ensured its durability from paint coating to maintain the structural performance of the structure against corrosion. However, in the case of steel with paint coating deterioration or unpainted, sectional loss of steel member can be occurred by corrosion problem. Compared with carbon steel, weathering steels ensures its durability from limiting the corrosion rate of the steel determined by corrosion rust layer. However, its corrosion damage can be different depending on the surface rust layer generated by the corrosion environment. In this study, therefore, accelerated corrosion test were carried out to evaluate corrosion resistance and damage level of carbon steel and weathering steel for steel structures. The composition and micro structure of the corrosion products formed on the surface of the steel were analyzed, since the process of forming the rust layer and the stabilization of the rust of carbon steel and weathering steel were different. Also, correlation between the amount of corrosion loss and the thickness of corrosion products according to the steel type was examined and the estimation equation of corrosion loss for structural steel was presented based on the thickness of the corrosion product.
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