Electrochemical Corrosion Behavior of Fe3Al/TiC and Fe3Al-Cr/TiC Coatings Prepared by HVOF in NaCl Solution
Round 1
Reviewer 1 Report
Please see the attached file.
Comments for author File: 
Comments.pdf
Author Response
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Author Response File: Author Response.pdf
Reviewer 2 Report
The aim of the paper, i.e. the corrosion behavior of Fe3Al/TiC and Fe3Al-Cr/TiC composite coatings, prepared by high velocity oxy fuel (HVOF) spraying, is quite interesting.
This is a good paper with new and interesting results. My impression is that this work is a very solid piece of science and an important one. The abstract summarize the work. The purpose of the study is clearly outlined and the findings of prior work are well discussed. All topics are relatively well presented and discussed. However, the discussion of some results requires improvement. The summary and conclusions are sound and justified. All presented figures are good quality and they prove their point. The paper is written in good English. The manuscript is easily readable concerning language, style and presentation. The references are appropriate and up to date.
Following are some of my comments.
1. There is no discussion and references to the literature regarding the results obtained for open circuit potential and potentiodynamic polarization tests.
2. The authors mentioned that “The morphology and the elemental analysis of the coatings were analysed after performing the potentiodynamic polarization tests. This was done using a scanning electron microscope (SEM) JEOL JSM-840A, equipped with an energy dispersive X-ray spectroscopy (EDXS), to evaluate the composition of corrosion products.” I couldn’t find these results, unless they are presented in Figure 9. However, according to the text “Elemental analyses, extracted from XPS spectra of three coatings, before and after passivation tests during potentiodynamic polarization test in 3.5 % NaCl solution, are presented Fig. 9.” It should be clarified.
Author Response
We thank the editor and reviewers for giving us the chance to revise our manuscript and for providing us such constructive comments. The following are our brief responses:
Reviewer 2
The aim of the paper, i.e. the corrosion behavior of Fe3Al/TiC and Fe3Al-Cr/TiC composite coatings, prepared by high velocity oxy fuel (HVOF) spraying, is quite interesting. This is a good paper with new and interesting results. My impression is that this work is a very solid piece of science and an important one. The abstract summarize the work. The purpose of the study is clearly outlined and the findings of prior work are well discussed. All topics are relatively well presented and discussed. However, the discussion of some results requires improvement. The summary and conclusions are sound and justified. All presented figures are good quality and they prove their point. The paper is written in good English. The manuscript is easily readable concerning language, style and presentation. The references are appropriate and up to date. Following are some of my comments.
1. There is no discussion and references to the literature regarding the results obtained for open circuit potential and potentiodynamic polarization tests.
-- Discussion added, thank you.
2. The authors mentioned that “The morphology and the elemental analysis of the coatings were analysed after performing the potentiodynamic polarization tests. This was done using a scanning electron microscope (SEM) JEOL JSM-840A, equipped with an energy dispersive X-ray spectroscopy (EDXS), to evaluate the composition of corrosion products.” I couldn’t find these results, unless they are presented in Figure 9. However, according to the text “Elemental analyses, extracted from XPS spectra of three coatings, before and after passivation tests during potentiodynamic polarization test in 3.5 % NaCl solution, are presented Fig. 9.” It should be clarified.
-- A major revision is done on the surface analysis section. A supplementary file on XPS results is added, referred and discussed in the text. Thank you.
Round 2
Reviewer 1 Report
Please see the attached file.
Comments for author File: Comments.pdf
Author Response
Dear reviewer,
Please find attached the PDF format of a point by point response.
Thanks
Najmeh
Author Response File: Author Response.pdf
Round 3
Reviewer 1 Report
Please see the attached file.
Comments for author File: Comments.pdf
