超低碳贝氏体钢(ULCB)和耐候钢09CuPCrNi的耐蚀性

Corrosion Resistance of Weather-Resisting Steel 09CuPCrNi and Ultra Low Carbon Bainitic Steel(ULCB)

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Fe_3O_4组成致密的内锈层、由α-,γ-FeOOH和Fe_3O_4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。

The corrosion 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 diffractometer and energy dispersive spectrum 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 α-FeOOH, /3-FeOOH and Fe3O4 and loose outer rust layer consisting of α-, γ- FeOOH and Fe3O4, and the copper and chromium alloy elements enriched at rust layer - steel substrate interface and in rust layer.