High-performance chemical mechanical polishing of GCr15 bearing steel enabled by the synergistic action of oxalic acid and H2O2

Liu, Jinwei; Jiang, Liang; Xiao, Gangguo; Qian, Linmao

doi:10.1007/s10008-022-05122-0

Cited by 3 publications

(1 citation statement)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Combined with our previous research [27,54], the findings suggest that carboxylic acids can be used as promising complexing agents for steel's CMP. The carbon chain length of carboxylic acids had a significant influence on the CMP's performance, especially the surface quality.…”

Section: Action Mechanism Of Citric Acid and H2o2 In The Cmp Of 18crn...supporting

confidence: 65%

Attaining Ultra-Smooth 18CrNiMo7-6 Case Hardening Steel Surfaces with Chemical Mechanical Polishing

et al. 2022

Self Cite

View full text Add to dashboard Cite

Smooth surfaces are conducive to improving the lubrication of gears in mechanical systems. In this study, chemical mechanical polishing (CMP) was used to process 18CrNiMo7-6 case hardening steel, a typical material for gears. The results reveal that compared with formic acid and oxalic acid, citric acid can be used as a suitable complexing agent without causing apparent corrosion, probably due to the fact of its relatively stable adsorption. A synergistic effect exists between citric acid and H2O2. At pH 3, with 0.067 M citric acid and 1 wt% H2O2, a satisfactory CMP performance (i.e., a 514 nm/min material removal rate (MRR) and a 0.85 nm surface roughness Sa) was achieved. After polishing, no observable defects were found on the surface, and no discernible processing damage occurred to the substrate. In terms of the CMP’s mechanism, iron is first oxidized to Fe2+ and Fe3+, which then react with citric acid to form complexes. On the one hand, most of the complexes may stay on the surface to prevent further corrosion and, thus, the surface quality is excellent. On the other hand, the complexes may reduce the surface integrity and, thus, the MRR is high. The findings open new avenues for attaining ultra-smooth steel surfaces with CMP through controlling corrosive wear.

show abstract

Section: Action Mechanism Of Citric Acid and H2o2 In The Cmp Of 18crn...supporting

confidence: 65%