X80管线钢包埋渗铝层的显微组织和耐腐蚀性能
Microstructure and Corrosion Resistance of Pack Aluminizing Layer on Pipeline Steel X80
摘 要
对X80管线钢在950℃下保温4 h进行包埋渗铝,采用X射线衍射仪、扫描电子显微镜分析了渗铝层的物相组成和微观形貌,并用显微硬度仪、电化学测量系统测试了渗铝前后X80管线钢的显微硬度和电化学性能.结果表明:X80管线钢渗铝层主要由FeAl和Fe3Al相组成;除在渗层深度约为100 μm处有少量孔隙外,渗铝层整体致密连续,厚度约为220 μm;与渗铝前相比,渗铝后X80管线钢显微硬度明显提高,自腐蚀电位和电流密度均下降,但其腐蚀形貌均匀,未出现明显的局部腐蚀形貌.
包埋渗铝
显微组织
耐腐蚀性能
pipeline steel X80
pack aluminizing
microstructure
corrosion resistance
Abstract
Pack aluminizing was performed on pipeline steel X80 at 950℃ for 4 h.The phase composition and microstructure of the aluminizing layer were analyzed by means of XRD and SEM.The microhardness and electrochemical properties of the pipeline steel X80 before and after aluminizing were also tested by microhardness instrument and electrochemial measurement system.The results show that the aluminizing layer of the pipeline steel X80 was mainly composed of FeAl and Fe3Al alloy phase.Except a small amount of holes existing in the depth of 100 μm,the aluminizing layer was dense and continuous with a thickness of about 220 μm.Compared with non-aluminized pipeline steel X80,the microhardness of the steel after aluminizing was obviously higher.Furthermore,the self-corrosion potential and current density decreased.The corrosion morphology was uniform and no obvious local corrosion morphology appeared.
中图分类号 TB332
所属栏目 材料性能及其应用
基金项目 陕西省教育厅专项科研计划资助项目(09JK688);西安石油大学《材料加工工程》省级重点学科资助项目
收稿日期 2009/9/29
修改稿日期 2010/8/5
网络出版日期
作者单位点击查看
备注黄敏(1979-),女,陕西洋县人,讲师,博士.
引用该论文: HUANG Min,WANG Yu. Microstructure and Corrosion Resistance of Pack Aluminizing Layer on Pipeline Steel X80[J]. Materials for mechancial engineering, 2010, 34(10): 62～64
黄敏,王宇. X80管线钢包埋渗铝层的显微组织和耐腐蚀性能[J]. 机械工程材料, 2010, 34(10): 62～64
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