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研究了不同碳含量和显微组织的低合金钢的耐腐蚀性能和腐蚀行为,并与商业耐候钢09CuPCrNi进行了相应的比较.通过金相显微镜、扫描电镜观察,轧后水冷钢的主体组织为板条状贝氏体,轧后空冷钢为针状铁素体、粒状贝氏体、M/A小岛和少量渗碳体(珠光体)的混合物.用干湿循环加速腐蚀实验对耐蚀性测定结果表明:低碳钢(0.03%C)和轧后水冷的较高碳含量钢(0.1%C)的耐蚀性均明显优于09CuPCrNi;低碳含量钢的组织类型对其耐蚀性影响不大;较高碳含量情况下,单相贝氏体钢的耐蚀性优于由铁素体、渗碳体(珠光体)等构成的复相组织钢;轧后水冷时,不同碳含量的钢耐蚀性差别不大;轧后空冷时,低碳含量钢的耐蚀性优于较高碳含量钢.用扫描电镜对锈层进行观察,可以看出耐蚀性较好的样品在腐蚀后期形成了致密的内锈层.
The corrosion resistance and corrosion behavior of low carbon steels with different carbon content and microstructure were studied and compared with commercial weathering steels 09CuPCrNi.The microstructure of rolled steel after cold rolling was observed by optical microscope and scanning electron microscope Strip-shaped bainite, air-cooled rolled steel after acicular ferrite, granular bainite, M / A island and a small amount of cementite (pearlite) mixture with wet and dry cycle accelerated corrosion test of corrosion resistance The results show that the corrosion resistance of low carbon steel (0.03% C) and high carbon content steel (0.1% C) after rolling is obviously better than that of 09CuPCrNi. The corrosion resistance of low carbon steel The corrosion resistance of single-phase bainitic steels is better than the composite microstructure steel composed of ferrite and cementite (pearlite), etc. When the carbon content after rolling is different from the carbon Content of steel corrosion resistance difference is not big; air cooling after rolling, the corrosion resistance of low-carbon steel is better than the higher carbon content of steel. Scanning electron microscopy of the rust layer can be seen better corrosion resistance of the sample In the late corrosion formed a dense internal rust layer.