典型工业沿海区域的大气环境腐蚀性评价

目的 利用现役金属材料对工业沿海区域所处不同大气环境进行环境腐蚀性评价，并研究不同金属材料的腐蚀行为差异性，探讨工业沿海大气环境下金属材料的耐蚀性选择。方法 在不同大气环境下，选择现役金属材料Q235、16MnNi和L415开展1 a的户外曝晒试验，并利用质量损失分析、扫描电镜等手段，通过对金属基材进行腐蚀机理研究，评价大气环境的腐蚀性。结果 Q235、16MnNi和L415等3种钢在不同区域沿海工业大气环境下的腐蚀行为受大气腐蚀环境的影响较大，腐蚀产物中含有一定量的Cl和S。同种金属材料表面锈层的特殊结构，使得其基体与大气环境中的腐蚀因子相接触，引发了金属材料在不同大气腐蚀环境中不同腐蚀行为的差异性。结论 工业沿海区域的大气环境中，大气腐蚀性差异由酸循环腐蚀机制形成。3种钢材在腐蚀初期，由于锈层多孔隙结构和可溶性腐蚀产物形成，加重了腐蚀程度。黄岛区域、曹妃甸区域、岚山区域和湛江区域的大气腐蚀等级分别为C2、C3、C2、C3级。

Atmospheric Environment Corrosion Evaluation of Typical Industrial Coastal Areas

The work aims to evaluate the environment corrosion of different atmospheric environments in industrial coastal areas with active metal materials, study the difference of corrosion behavior of different metal materials, and discuss the selection of corrosion resistance of metal materials in the industrial coastal atmospheric environment. Under different atmospheric conditions, Q235, 16MnNi and L415 were selected to develop outdoor exposure test for one year, and the corrosion mechanism of metal substrate was studied by means of weight loss analysis and scanning electron microscope to evaluate the corrosion of atmospheric environment. The corrosion behavior of Q235, 16MnNi and L415 steels in the coastal industrial atmospheric environment in different regions was greatly affected by the atmospheric corrosion environment. The corrosion products contained a certain amount of Cl and S. The special structure of the rust layer on the surface of the same metal material made its substrate come into contact with the corrosion factors in the atmospheric environment, which lead to different corrosion behaviors of metal materials in different atmospheric corrosion environments. In the atmospheric environment of industrial coastal areas, the difference in atmospheric corrosion is caused by the acid cycle corrosion mechanism. At the initial stage of corrosion, the corrosion of the three kinds of steel was aggravated due to the porous structure of the rust layer and the formation of soluble corrosion products. The atmospheric corrosion grade of Huangdao area, Caofeidian area, Lanshan area and Zhanjiang are is C2, C3, C2 and C3 respectively.