75Cr3C2-25NiCr and 86WC-10Co-4Cr High Wear- and Corrosion-Resistant Cermet Coatings Deposited on A356 Substrate by High-Velocity Oxy-Fuel Technique
, Elahe Khodaveysi 2, Masoud Roknian 2, Mohsen Sheikhi 2 and Akbar Heidarpour 3Round 1
Reviewer 1 Report
24-8-22 review report
75Cr3C2-25NiCr and 86WC-10Co-4Cr High Wear- and Corro- 2 sion-resistant Cermet Coatings Deposited on A356 Substrate by 3 High-velocity Oxy-fuel Technique 4 Yousef Mazaheri 1, *, Elahe Khodaveysi 2, Masoud Roknian 2, Mohsen Sheikhi 2 and Akbar Heidarpour 3
Report
· Cr3C2-NiCr and WC-Co-Cr cermet coatings have been developed on A356 aluminum-based alloy substrate by high-velocity oxy-fuel (HVOF) technique for use in wear and corrosion applications.
· The substrate and coatings have been characterized using field emission scanning electron microscope (FESEM) equipped with the energy dispersive spectroscope (EDS), microhardness, wear, and corrosion test instruments
· Microstructural observations revealed that the coatings with an average thickness of about 250 μm well bonded with the substrate.
· Cermet coatings showed significantly lower mass losses, wear rates, and friction coefficients in comparison with the A356 substrate.
· The mass loss and friction coefficient of the WC-Co-Cr coating under an applied load of 10 N was about 0.2 mg and 0.13 (about 99.5% and 79.7% lower than that of the A356 substrate
· The study reveals significant improvements in the corrosion performances of the coated samples.
· The introduction part is good
· Latest references are given
· The experimented part is given in detail
· Useful conclusions are drawn from the experimental data
· The figures are good
· The SEM images are very attractive and highly impressive
· The microhardness aspects are beautifully discussed
· Again The SEM images are very sharp
· EDS spectra are discussed in detail
· Figure 17. Polarization curves of samples immersed in the electrolyte. Typing not clear
· TOFEL region or TAFEL region. please check up
· Clearly and boldly state the relation between phase angle values and corrosion resistance
· Are they directly related
· The equivalent circuit diagrams are good and appreciated
· The paper may be accepted after minor revision
· The English of the paper may be still improved
· Best wishes to the authors
· May God bless you all
·
Author Response
We express our gratitude to the Reviewer #1 for his/her encouraging remarks and also for his/her comments which helped us to improve the quality of our manuscript entitled “75Cr3C2-25NiCr and 86WC-10Co-4Cr High Wear- and Corrosion-resistant Cermet Coatings Deposited on A356 Substrate by High-velocity Oxy-fuel Technique; Coatings-1893835”. Our detailed answers to his/her comments including revisions made in the manuscript follows:
Comments and Suggestions for Authors:
Cr3C2-NiCr and WC-Co-Cr cermet coatings have been developed on A356 aluminum-based alloy substrate by high-velocity oxy-fuel (HVOF) technique for use in wear and corrosion applications.
The substrate and coatings have been characterized using field emission scanning electron microscope (FESEM) equipped with the energy dispersive spectroscope (EDS), microhardness, wear, and corrosion test instruments
Microstructural observations revealed that the coatings with an average thickness of about 250 μm well bonded with the substrate.
Cermet coatings showed significantly lower mass losses, wear rates, and friction coefficients in comparison with the A356 substrate.
The mass loss and friction coefficient of the WC-Co-Cr coating under an applied load of 10 N was about 0.2 mg and 0.13 (about 99.5% and 79.7% lower than that of the A356 substrate
The study reveals significant improvements in the corrosion performances of the coated samples.
The introduction part is good.
Latest references are given.
The experimented part is given in detail.
Useful conclusions are drawn from the experimental data.
The figures are good.
The SEM images are very attractive and highly impressive.
The microhardness aspects are beautifully discussed.
Again the SEM images are very sharp.
EDS spectra are discussed in detail.
Response: Thanks for your kind words.
Figure 17. Polarization curves of samples immersed in the electrolyte. Typing not clear.
Response: Thanks, we agree with the reviewer that our text was not clear in this subject. Followings were modified in the revised manuscript:
“Figure 17. Potentiodynamic polarization curves of A356 substrate, Cr3C2-NiCr, and WC-Co-Cr coatings immersed in a one molar H2SO4 solution for 3600 s.”
TOFEL region or TAFEL region. please check up.
Response: Thanks for mentioning this. The mentioned word was corrected in the revised manuscript.
“To extract the electrochemical parameters, the TAFEL region of the cathodic and anodic branches was extruded.”
Clearly and boldly state the relation between phase angle values and corrosion resistance. Are they directly related?
Response: We appreciate the reviewer suggestion. It is done now.
“In fact, the closer value of the phase angle to 90 degrees indicates the more capacitive behavior and the decrease of this value towards zero proves the resistance behavior. However, the total resistance of the system in the base sample is lower than that of other samples, similar to the obtained results from the Nyquist curves. As can be seen, the A356 sample is at a higher phase angle than the other two samples that illustrates a more capacitive behavior. This can be due to the formation of an oxide layer on the surface of the aluminum sample. On the other hand, the sample with WC-Co-Cr coating has a lower phase angle and higher corrosion resistance.”
The equivalent circuit diagrams are good and appreciated.
The paper may be accepted after minor revision
The English of the paper may be still improved.
Response: To improve English, the whole manuscript was checked for language and grammatical error.
Best wishes to the authors
May God bless you all
Response: Thanks for your kind words.
Author Response File: 
Author Response.docx
Reviewer 2 Report
Comments to Authors
The manuscript entitles, “75Cr3C2-25NiCr and 86WC-10Co-4Cr High Wear- and Corrosion-resistant Cermet Coatings Deposited on A356 Substrate by High-velocity Oxy-fuel Technique” shows a similarity index of 28 % with already published data. As this is against the Copyright Act, consequently, it should not be accepted for publication in Coatings. It must be rewritten and submitted again for further evaluation.
Comments for author File: 
Comments.pdf
Author Response
We express our gratitude to the Reviewer #2 for his/her encouraging remarks and also for his/her comments which helped us to improve the quality of our manuscript entitled “75Cr3C2-25NiCr and 86WC-10Co-4Cr High Wear- and Corrosion-resistant Cermet Coatings Deposited on A356 Substrate by High-velocity Oxy-fuel Technique; Coatings-1893835”. Our detailed answers to his/her comments including revisions made in the manuscript follows:
Comments and Suggestions for Authors:
The manuscript entitles, “75Cr3C2-25NiCr and 86WC-10Co-4Cr High Wear- and Corrosion-resistant Cermet Coatings Deposited on A356 Substrate by High-velocity Oxy-fuel Technique” shows a similarity index of 28 % with already published data. As this is against the Copyright Act, consequently, it should not be accepted for publication in Coatings. It must be rewritten and submitted again for further evaluation.
This duplication needs to be reduced.
Response: We have reduced that in the revised manuscript as far as possible.
Author Response File: Author Response.docx
Reviewer 3 Report
The submitted manuscript is outstanding literature. All the results are convincing and both the text and graphic demonstrations are well presented.
Author Response
We express our gratitude to the Reviewer #3 for his/her careful consideration and kind words about our manuscript entitled “75Cr3C2-25NiCr and 86WC-10Co-4Cr High Wear- and Corrosion-resistant Cermet Coatings Deposited on A356 Substrate by High-velocity Oxy-fuel Technique; Coatings-1893835”.
Comments and Suggestions for Authors:
The submitted manuscript is outstanding literature. All the results are convincing and both the text and graphic demonstrations are well presented.
Response: Thanks for your kind words.
Author Response File: Author Response.docx
