摘要
利用脉冲电沉积(PED)预处理,在纯铁和45钢表面形成由厚度50 nm左右的片状结构组成的含Cr、Ni预处理层,然后再在480℃进行9 h气体渗氮。采用扫描电镜(SEM)和电子探针(EPMA)对预处理层和氮化层的表面形貌和成分进行表征,采用X射线衍射(XRD)对氮化层进行物相分析,结果表明:通过脉冲电沉积预处理,纯铁和45钢都实现了低温、快速气体渗氮。通过硬度测量及电化学方法测试表明,脉冲电沉积预处理不仅提高了气体渗氮后纯铁及45钢表面硬度,改善了脆性,引入的Cr、Ni元素及Ni-Cr-Fe合金层还提高了氮化层的耐蚀性能。
Using pulse electro-deposition （PED） pretreatment, a pretreatment layer composed by lamellar structure with a thickness of 50 nm, containing Ni and Cr was formed on the surface of iron and 45 steel. Then, the iron and 45 steel samples were gas-nitrided at 480 ~C for 9 h. A field emission scanning electron microscope （SEM） and electron probe X-ray micro- analyzer （EPMA） were used to characterize the morphology and composition of the pretreatme;at layer and the nitrided layer. The structure of the nitrided layer was characterized by X-ray diffraction （XRD）. Results show that iron and 45 steel achieve low-temperature rapid gas nitriding by this pretreatment. Through hardness measurement and electrochemical test, the pulse electrodeposition pretreatment not only improves the hardness and changes the brittleness of nitriding surface, but also ensures corrosion resistance because of the Ni-Cr-Fe alloy layer.
出处
《中国表面工程》
EI
CAS
CSCD
北大核心
2016年第5期24-33,共10页
China Surface Engineering
基金
国家自然科学基金(51272141)
国家高技术研究发展计划(863计划)(2015AA034404)
关键词
脉冲电沉积
预处理层
气体氮化
低温
耐蚀性
pulse electro-deposition（PED）
pretreatment layers
gas nitriding
low temperature
corrosion resistance
