Abstract: The   corosion   resistance   of   14 mm   plate   of   steel   09CuPCrNi(0.09C,0.35Mn,0.09P,0.31Cu,0.45Cr, 0.31Ni)and    ULCB    steel(0.05C,1.61Mn,0.51Cu,0. 17Cr,0.26Ni)was    measured    by    periodic    dip    corrosion    test    and the corrosion resistance mechanism was  studied by polarizing microscope,X-ray difractometer and energy dispersive  spec- trum analyser.Results showed that the corrosion resistance of ULCB steel was better than that of steel 09CuPCrNi and it was  found  that  there  were  dense  inner rust  layer  consisting  of a-Fe00H,B-Fe0OH  and  Fe₃O₄  and  loose  outer rust  layer consisting  of a-,y-Fe0OH  and Fe₃O₄,and the  copper  and  chromium  alloy  elements  enriched  at rust layer  -  steel  substrate interface and in rust layer.

Key words: Ultra , Low , Carbon , Bainitic , Steel,Weather-Resisting , Steel , 09CuPCrNi,Corrosion , Resistance,Rust Layer

摘要： 通过周期性浸润腐蚀试验测定了ULCB钢(%:0.05C、1.61Mn、0.51Cu、0.17Cr、0.26Ni)和耐候钢 09CuPCrNi(%:0.09C、0.35Mn,0.09P、0.31Cu、0.45Cr、0.31Ni)14 mm板的耐腐蚀性能，并用偏光显微镜， X-射线衍 射仪和能谱仪等研究了耐蚀机理。结果表明，ULCB钢的耐腐蚀性能优于09CuPCrNi钢；发现两种钢均存在由α- FeOOH,β-FeOOH和Fe₃O₄组成致密的内锈层、由α-,γ-Fe0OH和Fe₃O₄组成的疏松外锈层；Cu和Cr合金元素在锈 层和锈层-钢基体界面均存在富集现象。

关键词: 超低碳贝氏体钢 耐候钢09CuPCrNi ,  耐蚀性 锈层