Q235钢在氧化性含Cl气氛中的高温腐蚀行为  

High-temperature Corrosion Behavior of Q235 Steel in Oxidizing Atmosphere Containing Chlorine

作　　者：陈土春 向军淮[1] 江龙发 熊剑 白凌云[1] 徐勋虎 徐鑫成 CHEN Tuchun;XIANG Junhuai;JIANG Longfa;XIONG Jian;BAI Lingyun;XU Xunhu;XU Xincheng(Jiangxi Key Laboratory of Surface Engineering,Jiangxi Science and Technology Normal University,Nanchang 330013,China;Nanchang Customs Technical Center,Nanchang 33003&China;Jiangxi Hengda High-tech Co.,Ltd.,Nanchang 330096,China)

机构地区：[1]江西科技师范大学,江西省材料表面工程重点实验室,南昌330013 [2]南昌海关技术中心,南昌330038 [3]江西恒大高新技术股份有限公司,南昌330096

出　　处：《中国腐蚀与防护学报》2021年第4期560-564,共5页Journal of Chinese Society For Corrosion and Protection

基　　金：江西省教育厅科技项目(GJJ160770和GJJ190606)。

摘　　要：研究了500和600℃下N_(2)-0.26%HCl-1.6%O_(2)-3.2%CO_(2)混合气体中Q235钢的高温腐蚀行为。结果表明,在两个温度下Q235钢均出现了明显的腐蚀增重。随着温度的升高,腐蚀速率迅速增加。在两个温度下形成的氧化膜比较类似,分层明显,外层为较厚的Fe_(2)O_(3)层,内层为 Fe_(3)O_(4)。大部分氧化膜表面出现了剥落和起皮,600℃下更为严重,而且在此温度下 Fe_(3)O_(4)层中出现了大量孔洞。Q235钢的腐蚀符合"活化氧化机制",在600℃温度下尤为明显,即挥发性的金属氯化物在金属与氧化膜界面处形成,向外挥发扩散,最终在氧压较高的区域生成金属氧化物。因此,在氧化性含Cl气氛中,Q235钢不适合在500℃以上的工况中使用。The chlorine-induced corrosion behavior of Q235 steel in N_(2)-0.26%HCl-1.6%O_(2)-3.2%CO_(2) mixed gas at 500 and 600 ℃ was investigated. At both temperatures, the Q235 steel presented obvious mass gain and the corrosion rate increased rapidly with the increase of temperature. The scales formed at both temperatures are very similar, with formation of an outer thicker Fe_(2)O_(3) layer and an inner Fe_(3)O_(4) layer. Most of the surface of scales peeled off and the case is more serious at 600 ℃. Furthermore, at this temperature a large number of holes appeared in the Fe_(3)O_(4) layer. The corrosion mechanism of Q235 steel conforms to the"activated oxidation mechanism", especially at 600 ℃, which means that volatile metal chlorides form at the metal/oxide interface and then diffuse outwards, turning into oxides finally in the region of higher oxygen partial pressure. Therefore, Q235 steel is not suitable to be used above 500 ℃ in an oxidizing chlorine-containing atmosphere.

关 键 词：Q235钢 氯腐蚀 高温腐蚀 活化氧化 

分 类 号：TG171[金属学及工艺—金属表面处理]