| 含SO_2大气中20碳钢腐蚀产物的演变 |
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| 引用本文： | 林翠,赵晴,刘月娥,梁健能.含SO_2大气中20碳钢腐蚀产物的演变[J].金属学报,2010(3). |
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| 作者姓名： | 林翠 赵晴 刘月娥 梁健能 |
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| 作者单位： | 南昌航空大学轻合金加工科学与技术国防重点学科实验室;南昌航空大学材料科学与工程学院; |
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| 基金项目： | 国家自然科学基金项目50601012;;江西省高等学校重点实验室研究项目GJJ08520资助~~ |
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| 摘 要： | 采用模拟大气腐蚀系统,利用OM,SEM,XRD和局部交流阻抗测试(LEIS)等研究了20碳钢在高湿度SO_2大气环境中腐蚀产物的形态变化和生长过程.结果表明,20碳钢表面首先生成Fe(OH)_2膜,Fe(OH)_2膜在酸性介质中发生破裂形成头部为绿色的丝状物,丝状物沿晶界腐蚀并向铁素体内生长;空气中SO_2,O_2和H_2O不断进入破裂的Fe(OH)_2膜内,导致Fe不断溶解并形成FeSO_4巢穴,FeSO_4与O_2和H_2O作用在巢穴内生成FeOOH堆积物,最后形成胞状腐蚀产物.随腐蚀时间的延长,胞状腐蚀产物增多,锈层阻抗增加,腐蚀产物层厚度不均匀;继续腐蚀,腐蚀产物变得均匀致密SO_2含量越高,胞状物增加越快.
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| 关 键 词： | 20碳钢 SO_2 大气腐蚀 生长规律 |
EVOLUTION OF CORROSION PRODUCTS OF 20 CARBON STEEL IN ATMOSPHERE CONTAINING SO_2 |
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| Abstract: | The evolution of corrosion products of 20 carbon steel in simulated humidity atmosphere containing SO_2 was investigated by means of OM,SEM,XRD and localized electrochemical impedance spectrum(LEIS).Results showed ferrous hydroxide film firstly formed on the sample surface; the film ruptured in the acidic medium,and then filaments with green heads occurred.The filaments grew along the grain boundaries and into ferrite grain.Ferrite phase was dissolved when SO_2,O_2 and H_2O continuously penetrated into the ... |
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| Keywords: | 20 carbon steel SO_2 atmospheric corrosion growth characteristics |
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