采用模拟污染大气腐蚀系统,利用光学显微镜、SEM、XRD和XPS等研究了湿度对含体积分数为5×10-6的SO2环境中20低碳钢腐蚀形貌和腐蚀产物生长过程的影响。结果表明：在不同湿度环境中,腐蚀产物均主要由α-FeOOH、γ-FeOOH、FeSO4、Fe3O4、γ-Fe2O3组成;随湿度增大,FeOOH含量增多,低碳钢的腐蚀速率增大;在相对湿度为65%,75%时,腐蚀曲线分为指数增加和线性增加2个阶段,在85%,95%时,腐蚀曲线符合线性增长规律;在相对湿度为65%的环境中,腐蚀产物主要以腐蚀圈形式生长,随着相对湿度增加,腐蚀圈周围有短小丝状腐蚀产物出现;在相对湿度为95%时主要为丝状腐蚀产物,其上伴随有胞状腐蚀产物生成,且在胞状腐蚀产物下存在明显的腐蚀坑。
Through simulated polluted atmospheric corrosion system,the effect of relative humidity（RH） on the corrosion morphology and the growth process of corrosion products of 20 low carbon steel in atmosphere containing 5×10-6 volume fraction SO2 was studied by means of optical microscopy,SEM,XRD and XPS.The results show that the corrosion products were mainly composed of α-FeOOH,γ-FeOOH,FeSO4,Fe3O4,γ-Fe2O3 under the enviroment of different relative humidities,and the concentration of FeOOH increased with increase of RH,and the corrosion rate increased,too.When the RH were 65% and 75%,the corrosion curves was divided into two stages which respectively followed by exponential increase and the linear growth.When the RH were 85% and 95%,the corrosion curves followed by linear growth.At the enviroment of RH of 65%,the corrosion products grew in the form of corrosion-ring.With increase of RH,the filiform corrosion products were found around the corrosion-ring.When the RH was 95%,it was filiform corrosion products with cellular corrosion products,and obvious pits were observed under the cellular corrosion products.
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