GH625镍基高温合金化学抛光工艺  

Chemical polishing of GH625 nickel-based superalloy

作　　者：马宁 张峻山 MA Ning;ZHANG Junshan(School of Mechanical and Electrical Engineering,Shenyang Aerospace University,Shenyang 110136,China)

机构地区：[1]沈阳航空航天大学机电工程学院,辽宁沈阳110136

出　　处：《电镀与涂饰》2024年第4期79-86,共8页Electroplating & Finishing

摘　　要：[目的]化学抛光是高温合金化学铣切的关键步骤之一,能够去除高温合金表面的微观不平整缺陷,令其满足航空航天、石油化工等领域对零件表面高品质的要求。[方法]通过正交试验和单因素实验研究了抛光液配方和工艺参数对GH625高温合金化学抛光速率和表面粗糙度的影响。[结果]GH625高温合金化学抛光的较佳配方和工艺条件为:盐酸100 g/L,硝酸170 g/L,氢氟酸90 g/L,Fe^(3+)170 g/L,温度50℃,时间5 min,试片水平放置。在该条件下化学抛光后,GH625高温合金表面变得平整均匀而富有金属光泽,表面粗糙度Ra从初始的10.3μm降至1.1μm。[结论]本文的研究结果可为GH625高温合金的化学抛光提供参考。[Introduction]Chemical polishing is one of the key steps in chemical milling of superalloys,which can remove microscopically uneven defects on their surfaces,enabling the superalloys to meet the high-quality surface requirements of aerospace,petrochemical,and other fields.[Method]The effects of the composition of polishing solution and process parameters on the material removal rate and surface roughness of GH625 superalloy were studied by orthogonal test and single-factor experiments.[Result]The composition of polishing solution and process parameters for chemical polishing of GH625 superalloy were optimized as follows:chloride acid 100 g/L,nitric acid 170 g/L,hydrofluoric acid 90 g/L,Fe^(3+)170 g/L,temperature 50℃,time 5 min,and horizontal placement of specimens in polishing solution.After being chemically polished under the optimized conditions,the surface of GH625 superalloy became smooth,uniform,and bright,and its surface roughness Ra was decreased from 10.3μm initially to 1.1μm.[Conclusion]This research provides a reference for chemical polishing of GH625 superalloy.

关 键 词：镍基高温合金 化学抛光 表面粗糙度 材料去除速率 

分 类 号：TG175[金属学及工艺—金属表面处理]