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| High-temperature Corrosion Behavior of Q235 Steel in Oxidizing Atmosphere Containing Chlorine |
CHEN Tuchun1, XIANG Junhuai1( ), JIANG Longfa2, XIONG Jian3, BAI Lingyun1, XU Xunhu1, XU Xincheng1 |
1.Jiangxi Key Laboratory of Surface Engineering, Jiangxi Science and Technology Normal University, Nanchang 330013, China
2.Nanchang Customs Technical Center, Nanchang 330038, China
3.Jiangxi Hengda High-tech Co. , Ltd. , Nanchang 330096, China |
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Abstract The chlorine-induced corrosion behavior of Q235 steel in N2-0.26%HCl-1.6%O2-3.2%CO2 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 Fe2O3 layer and an inner Fe3O4 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 Fe3O4 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.
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Received: 21 July 2020
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| Fund: Science and Technology Research Program of Jiangxi Provincial Education Department(GJJ160770) |
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Corresponding Authors:
XIANG Junhuai
E-mail: xiangjunhuai@163.com
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About author: XIANG Junhuai, E-mail: xiangjunhuai@163.com
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