摘要
介绍了一种在Q235钢表面用等离子直接复合渗镀合成氮化钛的方法。该工艺方法形成的组织是Ti固溶体扩散层上分布着氮化钛颗粒和氮化钛沉积层,沉积层与基体为冶金结合。渗镀层表面硬度为1600～3400HV。将形成的氮化钛试样与表面进行双层辉光离子铬钼共渗及后续强化处理的试样进行电化学测试和耐腐蚀试验对比,结果表明:在10%硫酸、5%盐酸、3.5%NaCl水溶液和H2S富液(含5～8g/LHS,20g/LNH.HO)中,渗镀试样比铬钼共渗试样耐蚀性能分别提高了84.00,11.67,1.15,21.15倍。
TiN coating was directly synthesized on the surface of 20 steel using plasma infiltration.The original steel substrate and the plasma modified steel specimens were then subject to double glow plasma Cr-Mo co-permeation.The microstructure of the TiN modified layer was analyzed,while its microhardness was measured.At the same time,the corrosion resistance of the steel,TiN-modified steel,and the steel after TiN plasma modification and Cr-Mo plasma co-permeation was comparatively evaluated using electrochemical measurement and corrosion test.It was found that the TiN-modified layer was composed of Ti solid solution diffusing layer and TiN deposition layer.The TiN deposition layer had metallurgical bonding with the steel matrix,and the surface hardness of the TiN infiltrating layer was 1 600~3 400 HV.The corrosion resistant duration of the steel specimens after TiN plasma modification and Cr-Mo plasma co-permeation,in the corrosive medium such as 10% H2SO4,5% HCl,3.5% NaCl solution,and H2S pregnant solution(5～8 g/L H2S plus 20 g/L NH3·H2O),was as much as 85.00,12.67,2.15,and 22.15 times of that of the specimen after Cr-Mo co-permeation.
出处
《材料保护》
CAS
CSCD
北大核心
2007年第7期8-11,共4页
Materials Protection
基金
国家自然科学基金(50374050)
上海宝钢集团公司联合资助项目
山西省自然科学基金项目(20031050)
关键词
氮化钛
耐蚀性能
等离子渗镀
铬钼共渗
碳钢
TiN coating
corrosion resistance
plasma infiltration
Cr-Mo co-permeation
carbon steel
Cr permeation
