摘要
针对Q235钢采用常规气体氮化,其耐腐蚀性能日渐不能适应工程应用要求的问题,探索了添加稀土催渗剂对Q235钢进行稀土催渗氮化的方法。详细研究了渗氮工艺对氮化层厚度的影响。测量了渗氮试样表层硬度沿渗层深度的分布及耐蚀性能与渗氮工艺的定量关系。所有实验与观察均为稀土与常规2种渗氮试样在相同条件下平行操作并做对比分析。采用X光荧光谱仪测量了渗层稀土元素的分布。用X射线衍射仪测量了渗层的相组成。用金相显微镜观察了2种渗氮试样的显微组织。研究结果得出,稀土催渗氮化比常规氮化显著增加了氮化层的厚度,其显微硬度与耐腐蚀性能大幅提高。600℃下渗氮2h为最适宜的稀土氮化条件。
The nitriding specimens were prepared by means of adding RE elements as the activator to nitride low carbon steel （Q235） with nitrogen, and the chemical composition was determined by XFS. The effect of rare earth （RE） on the nitrizing depth, composition, microstructure and properties was studied. The experimental results showed that, in the same technical condition, the addition of RE can accelerate the nitriding rate greatly. The RE activator can greatly improve the corrosion resistance of Q235 steel because of modi- fying the microstructure of brighter layers. The optimum process of nitroding with RE activator is 600 ℃ ×2.5 h.
出处
《稀有金属快报》
CAS
CSCD
2007年第3期26-31,共6页
Rare Metals Letters
关键词
稀土元素
催渗作用
气体氮化
耐腐蚀性能
rare earth elements
catalytic effect
gas nitriding
corrosion resistant property
