摘要
采用低温气体多元共渗技术对25CrNiMo钢试样进行C、N、O三种元素共渗,实现了在材料表面形成均匀的渗层,而且渗层又厚又致密。利用X射线衍射和扫描电子显微技术测定了渗层相的组成以及渗层的表面形貌,采用电化学测试技术对渗层在1.0mol/L稀HCl溶液中的耐蚀性与原始材料的耐蚀性进行了对比试验研究,同时对渗层的显微硬度也进行了研究。结果表明渗层以氧化物、氮化物和碳化物为主,且氮化物居多,渗层厚度约30μm,耐蚀性能得到了大大的提高,相对原始材料的耐蚀性提高了近3倍,其腐蚀速度也低于原始试样的腐蚀速度,其表面硬度最高可达714HV,这对钻井防喷器控制装置性能的提高有重要意义。
Performance of blowout preventer material was studied by low temperature gas multicomponent infiltration technique.Carbon,nitro- gen and oxygen were infiltrated into the material.The phase construction and microstructure of alloying layer were investigated by XRD and SEM technique.The corrosion resistance of penetrated layer and base material was discussed by electrochemical method in 1.0 mol/L HCl so- lution.And the microhardness was studied by HMV-1T micro-sclerometer.The experimental results show that alloying infiltration layer contains oxide,nitride and carbide,and the nitride is primary.The thickness of alloying infiltration layer is about 30μm.The penetrated layer has much better corrosion resistance than that of base material.And the corrosion rate is also lower than that of the original sample.The maximal surface hardness is 714HV.These properties have important significance and foreground to blowout preventer material.
出处
《焊接》
北大核心
2007年第8期24-27,共4页
Welding & Joining
基金
北京市优秀人才培养计划资助项目(Z02-23)
关键词
防喷器
多元共渗
耐蚀性
硬度
blowout preventer
multi-element penetration
anti-corrosion property
hardness
