湖南地区大气腐蚀严酷性的环境因素与大气腐蚀监测仪评定

Evaluation of Environmental Factors Related with Atmosphere Corrosivity in Hunan Provice by Atmospheric Corrosion Monitoring Technique

通过大气暴晒试验和大气腐蚀监测仪(ACM)技术研究了碳钢在湖南大气环境中的腐蚀行为,探讨了大气环境因素、样品形状因子等对大气环境腐蚀严酷性评估的影响。结果表明,湖南地区碳钢腐蚀速率与空气中SO_(2)沉积量呈正相关关系,但氯化工厂附近Cl^(-)的沉积量成为了影响碳钢腐蚀的重要因素。在相同大气环境中,Q345钢的腐蚀速率快于Q235钢,Q235角钢的腐蚀速率快于Q235平板钢。ACM累计电量与Q235钢大气腐蚀速率之间符合线性关系,ACM技术可用于碳钢大气腐蚀行为预测和环境腐蚀性评定。

The corrosion behavior of carbon steels in Hunan province was comparatively studied via atmospheric exposure testing and atmospheric corrosion monitoring(ACM) technique, while the effects of environmental factors and the samples’ shape on the corrosivity evaluation of atmospheric environments were assessed. The results showed that the corrosion rate of carbon steels have a positive correlation with SO_(2) deposit rate in the atmosphere, while the Cl-deposit rate becomes the important influence factor when the corrosion of carbon steels exposed in sites at or nearby a chlorine chemical plant. The corrosion rate of Q345 steel is higher than that of Q235 steel, and the corrosion rate of Q235 angle steel is higher than that of the Q235 flat steel. A linear relationship between the corrosion rate and the cumulative electric quantity measured by ACM was revealed for Q235 carbon steel, thus ACM technology can be used to predict the atmospheric corrosion behavior of carbon steels and assess the corrosivity of atmospheric environments.