30CrMnSiA高强钢在北京地区的大气腐蚀研究

利用失重分析、形貌观察、断面分析和电化学交流阻抗谱等研究了30CrMnSiA高强钢在北京地区大气腐蚀的动力学规律和腐蚀特征。结果表明,30CrMnSiA高强钢在北京的大气腐蚀速率经历了腐蚀初期由快到慢和腐蚀3 a后由慢到快的过程。在大气暴露1,2,3,5 a的30CrMnSiA样品中,暴露3 a的样品锈层最致密,对侵蚀性离子的阻挡作用最强,相应腐蚀速率最低;30CrMnSiA高强钢在大气腐蚀的锈层既可以生长得非常致密,也可因为过厚产生内应力,从而导致锈层破裂;3 a后,30CrMnSiA样品锈层的开裂加速了腐蚀。

Study on Atmospheric Corrosion of 30CrMnSiA High Strength Steel in Beijing Area

Atmospheric exposure of 30CrMnSiA high strength steel was carried out in Beijing, a typical temperate and sub humid zone. Weight loss, surface appearance, fracture appearance, and electrochemical impedance spectrum were used to study the kinetics and characteristic of 30CrMnSiA high strength steel corrosion. The results showed that, in the initial stage, atmospheric corrosion of 30CrMnSiA high strength steel experiences a process of corrosion rate from high to low, and three years later it experiences a process of corrosion rate from low to high. The rust of three years samples was the most compact, which provided the highest impedance to corrosive species. Three years later, the rust of exposed samples will crack, and corrosion will be accelerated.