CeO_2对铁基自熔合金喷焊层组织和耐蚀性的影响  

Effect of Cerium Oxide on Microstructure and Corrosion Resistance of Spray-Welded Iron-Based Self-Fluxing Alloy Coating

作　　者：任鑫[1] 朱鹤[1] 曹丹凤[1] 孔令梅[1] 玄兹航 

机构地区：[1]辽宁工程技术大学材料科学与工程学院,辽宁阜新123000

出　　处：《材料保护》2014年第12期56-58,9,共3页Materials Protection

摘　　要：为改善铁基喷焊层的组织和耐蚀性能,利用氧-乙炔火焰喷涂+重熔的方法在Q235钢表面制备了含有CeO2的铁基自熔合金喷焊层。采用金相显微镜、扫描电镜(SEM)、能谱仪、极化曲线研究了CeO2含量对喷焊层组织结构和耐蚀性的影响。结果表明:喷焊层组织主要由固溶区及熔覆区组成;随CeO2含量的增加,组织明显细化,当CeO2含量为1.7%时组织细化效果最好,超过1.7%后组织又粗化;喷焊层的耐蚀性随稀土CeO2含量的增加出现先增加后降低的趋势,当CeO2含量为1.7%时喷焊层的耐蚀性最好。Oxyacetylene flame spraying was combined with remelting to incorporate CeO_2 into Fe-based selffluxing alloy coating on the surface of Q235 steel so as to acquire improved microstructure and corrosion resistance of the coating.The microstructure of as-prepared Fe- based self-fluxing alloy coating was analyzed with a metallographic microscope,a scanning electron microscope,and an energy dispersive spectrometer.The polarization curve of the Fe-based self-fluxing alloy coating was measured in relation to its corrosion resistance,and the effect of CeO_2 conlent on ils microstructure and corrosion resistance was investigated.Results indicated that as-prepared Fe-based selffluxing alloy coaling consisted of solid solution zone and cladding zone,and its microstructure tended to be considerably refined with increasing content of CeO_2.When the content of CeO_2 was fixed at 1.7%(mass fraction;the same hereafter),the microstructure of the Fe-based self-fluxing alloy coaling was refined to the maximum extent,and then it tended to be coarsened as the content of CeO,was above 1.7%.In the meantime,the corrosion resistance of the spray-melted coaling increased initially and decreased later with the increase of CeO_2 content.Particularly,the spray-melted coating with 1.7%CeO_2 exhibited the best corrosion resistance.

关 键 词：铁基自熔合金喷焊层 CEO2 组织 耐蚀性 

分 类 号：TG174.4[金属学及工艺—金属表面处理]