Ascorbyl Palmitate-Vitamin C Effective Friction Modifier and Wear Inhibitor for Steel in a PAO Base Oil
Tianhui Ren
Round 1
Reviewer 1 Report
Adding ascorbyl palmitate-Vitamin C in a PAO base oil to reduce friction and wear of steels is an interesting idea, and the experimental results of the effect on friction and wear reductions shown in the paper are superior comparing with conventional organic friction modifiers and antiwear additives. The manuscript are well organized and written. Two minor modifications are suggested.
1) Concentration effect. All tests were done with 1wt% AP concentration. Did the authors check the effect of concentration of AP?
2) Temperature effect. All tests were fixed at 150 C. Did the authors investigate the performance of AP additive in a wider temperature range, saying from room temperature to 150 C?
Author Response
We are thankful to Reviewer 1 for her/his appreciation and careful assessment of our manuscript. The responses to the Reviewer’s comments as well as the description of the resulting revisions are reported below.
1) Concentration effect. All tests were done with 1wt% AP concentration. Did the authors check the effect of concentration of AP?
Yes. We have done it. Please check the attached file.
2) Temperature effect. All tests were fixed at 150 C. Did the authors investigate the performance of AP additive in a wider temperature range, saying from room temperature to 150 C?
Yes. We have done it. Please check the attached file.
Author Response File: 
Author Response.pdf
Reviewer 2 Report
In this manuscript, a novel No-S,P and No-ash friction modifider was found, it is a vitamin C ester (AP). Its reduction of friction is better than that of MoDTC, PA or SA in PAO-4. The novel friction modifier also possesses good antiwear properties. The authors also studied the friction-reduction and antiwear mechanisms by using SEM-EDS, AFM and XPS etc. The results are meaningful for novel lubrication additives researchers. So, I agree this manuscript to be published in the journal of Lubricants.
Author Response
We are thankful to Reviewer for her/his appreciation and careful assessment of our manuscript.
