Study on the Influence of the MoS2 Addition Method on the Tribological and Corrosion Properties of Greases
Round 1
Reviewer 1 Report
Comments and Suggestions for Authors
Greetings
I am happy to write to you. In connection with a manuscript entitled; Study on the Influence of MoS2 Addition Method on the Tribological and Corrosion Properties of Greases”. This it can be accepted in your valuable journal after doing some major revisions which manuscript can be summarized as the followings:
1. The abstract must be written in a concise manner and explain the best results obtained.
2. The authors did not mention the novelty of their work. Thus, the novelty of this work should be clearly discussed.
3. All SEM B images do not contain a bar to indicate the magnification (figures 1, 2, 6 and 9).
4. Most of the references are old, so instead of using new references to make it clear that this work is new.
5. There are some errors in the language. The language must be revised.
Kind regards
Comments on the Quality of English Language
There are some errors in the language. The language must be revised.
Author Response
Thank you for comments. Please see the attachment.
Author Response File: 
Author Response.pdf
Reviewer 2 Report
Comments and Suggestions for AuthorsThe paper entitled “Study on the Influence of MoS2 Addition Method on the Tribological and Corrosion Properties of Greases”, by Zhu et al., reports and tries to explain the different performances of a set of greases using distinct methods of adding the MoS2 additives. The manuscript presents interesting results and it is well-written. To be accepted for publication, I would like to receive some answers on the minor and major issues stated below.
- The sentence “Grease occupies an important position in the national economy…” seems strange since the “national” economy is not a specific boundary condition because of the worldwide readership of the paper.
- Some sentences, and paragraphs in the introduction are very long and are un-referenced, it is, more papers should be used to base the stated information.
- The subsection “2.1. Experimental Materials and Characterization” is poorly written. Some “sentences” are not a sentence at all (just a list or a name of a compound). A careful revision of this subsection must be conducted.
- “Fig. 1 is the SEM image of MoS2 powder. It can be seen from SEM that MoS2 is a lamellar structure.” The lamellar structure is not clear in the micrograph. Please indicate, within the figure, the region used to infer this and/or better work on the result.
- In the “2.2. Preparation of Grease” subsection, please indicate, in all the procedures, whether they are or are not created by the authors. Since not a single reference is cited, please be clear about the experiments (if they were based on some other methods for example).
- “The energy that passed the test was 50 eV”, do you refer to the pass energy:
- How were the different mass fractions chosen? Please also comment on the non-dependence of the properties of Table 1 with the increase of MoS2 concentration, it is: there is a difference when compared to the addition of MoS2 with to grease without it. However, going from 0.01 to 0.07 wt. % (seven-fold difference) did not bring any change.
- There is no explanation of why only Method D is represented in the section “Soap Fiber Structure of Lithium Lipids”.
- Considering the reported uncertainty, Figure 4 confirms that there are no differences in performance when the wt. % is changed? Moreover, are the difference among the methods out of the uncertainty to be really important? Since it is a key topic of your work, more discussion on this should be presented.
- Figure 6 quality should be reviewed. Moreover, the message is not clear: the micrographs are just presented without further work on the result.
- In Figure 7, the raw data (in gray) are almost invisible. Furthermore, correct the p and s in some points (“FeO 2P3/2”, for example). They are always in lowercase.
- Regarding “The appearance of MoO2 and MoO3 indicates that the MoS2 additive has been oxidized during the friction process, that is, MoS2 may partially undergo tribochemical reactions during the friction process.”, how the authors may infer this since the XPS spectra to pure MoS2 is not shown? Perhaps, the material is already oxidized before the experiment.
- Method D presents a good result in tribological experiments, but it is the worst in corrosion tests. What method could be recommended by the authors by considering the gain of the overall process?
I’m looking forward to receiving a new, revised version of the manuscript.
Author Response
Thank you for comments. Please see the attachment.
Author Response File: Author Response.pdf
Reviewer 3 Report
Comments and Suggestions for AuthorsThe work present a study on the influence of MoS2 addition method on the tribological and corrosion properties of greases. The work is interesting and good, but still it can be improved prior to publication.
1. The introduction lacks a description of the different ways additives are added.
2. In the 2.1 experimental materials and characterization part of the article, some materials and instruments indicate specifications, models and manufacturers, some do not indicate, please specify the specifications of the drug and the model of the instrument.
3. In 3.2 Soap fiber structure of lithium lipids: The position of the ruler (20μm) in the figure should be consistent to make the picture more beautiful. The vertical range of the friction coefficient curve in 3.3.1 Friction reduction performance should be 0(0.02)-0.08.
4. Why the authors choose 6:1 ratio of base oil to thickener? Is there any basis for that?
5. The year of the cited references is not new enough, and more references from the last 5 years can be cited. For example:
Jiang, M.; Guo, X.; Dong, J.; Chen, G. Study on the lithium complex grease. Lubrication Engineering 2000, 25-28. can be replaced with Wu, C.; Hong, Y.; Ni, J.; Teal, P.D.; Yao, L.; Li, X. Investigation of mixed hBN/Al2O3 nanoparticles as additives on grease performance in rolling bearing under limited lubricant supply. Colloids and Surfaces A: Physicochemical and Engineering Aspects 2023, 659, 130811, doi:https://doi.org/10.1016/j.colsurfa.2022.130811.
6. Some theoretical explanations on tribological properties and corrosion can be added appropriately in the abstract and conclusion sections.
Comments on the Quality of English LanguageMinor editing of English language by a native speaker was required.
Author Response
Thank you for comments. Please see the attachment.
Author Response File: Author Response.pdf
Reviewer 4 Report
Comments and Suggestions for AuthorsDear authors,
criticism, suggestions and spelling corrections can be found in the comments section of the uploaded PDF file of your work.
Comments for author File: Comments.pdf
There are a number of awkwardly constructed sentences, e.g. several consecutive references to Figure 2 in the text or sentences that repeatedly end with 'respectively.' Perhaps the English language in the paper should be revised.
Author Response
Thank you for your comments. Please see the attachment.
Author Response File: Author Response.pdf
Round 2
Reviewer 1 Report
Comments and Suggestions for Authors
Greetings
The authors carefully made all necessary adjustments. Therefore, I recommend that you accept the manuscript.
Regards
Comments on the Quality of English Language
Minor editing of English language required
Reviewer 2 Report
Comments and Suggestions for AuthorsI'm very satisfied with the revised version of the manuscript. I may, now, recommend the publication of this work.
Reviewer 4 Report
Comments and Suggestions for AuthorsDear authors,
congratulations, the paper looks very good.
You have considered and implemented all comments and suggestions in the new version of the paper.
Thank you very much.
