Effects of the Shot Peening Process on Corrosion Resistance of Aluminum Alloy: A Review

Round 1

Reviewer 1 Report

The review deals with the Effect of Shot Peening Process on Corrosion Resistance of Aluminum Alloy. 
According to the reviewer, the paper is worth publishing at the Coatings Journal, but some corrections are needed and then the paper can be accepted for publication in the journal.
Additionally make the following corrections to the manuscript:

Comment 1
Figure 4
Peeing Duration
The authors should check the paper for spelling and typographical errors.

Comment 2
Line 126
Vaibhav et al. [35]
The authors should replace
Pandey et al. [35]

Comment 3
Lines 165 - 168 + Figure 6
The authors should explain (give more details) 
why with the increase of shot
size, the depth of residual stress layer increased significantly.

Comment 4
The Figure must be accompanied on the same page as the Figure's title (Figures 6, 9 and 13).
The authors should format the paper.

Comment 5
Lines 246 - 254 + Figure 10
The authors should explain if there is a difference between samples T01 - T09.

Comment 6
Mustafa et al. [60] investigated
The authors should replace
Abdulstaar et al. [60] investigated

Comment 7
Line 338
In order to solve the above problems and avoid conflicts. 
The authors should check if text is missing.

Comment 8
Lines 352 - 353
the optimization of the shot peening process is par-
ticularly important.
The authors should explain how this optimization occurs.

Author Response

Please see the attachment.

Author Response File: Author Response.pdf

Reviewer 2 Report

The current manuscript presents a review about the shot peening effect on corrosion resistance of Al alloys. There are some issues that should be considered as follows:

• The introduction section lacks a robust critical review according to the literature studies to focus on the significant impact of shot peening on the corrosion resistance.
• There some unreadable paragraphs those should be carefully revised; such as the sentence at lines 44,45.
• As a recent contribution for shot peening, it significantly affects the quality of the additively manufactured parts, that point should be clearly presented.

Maamoun, A.H.; Elbestawi, M.A.; Veldhuis, S.C. Influence of Shot Peening on AlSi10Mg Parts Fabricated by Additive Manufacturing. J. Manuf. Mater. Process. 2018, 2, 40. https://doi.org/10.3390/jmmp2030040

• The authors stated the marine equipment as one of the direct applications for applying shot peening. However, there was no comparison conducted between other used techniques to justify this point.
• A lot of technical expression should be well defined in the text such as Almen intensity, shot peening, laser shock peening, ultrasonic peening, ...etc. please revise that
• Introduction lacks references those should support the presented data.   
• The other manuscript sections lacks the presentation of values to verify the impact of shot peening on different Al alloys. A comparison tables are highly recommended to be included for residual stresses, effected depth, microhardness, corrosion resistance. 
• The resolution of most figures need to be improved.
• Figure 10, what the difference between the shot peening in red and blue colors. That should be illustrated on the plot. 
• The summary is too general. It should focus on the main parameters those should optimize the shot peening process. In addition to some recommendations regarding the authors' direct application for which Al alloy is recommended and the range of shot peening parameters. 

Author Response

Please see the attachment.

Author Response File: Author Response.pdf

Round 2

Reviewer 2 Report

The revised manuscript is significantly improved and all review comments and recommendations are well addressed. There is still a minor issue that should be carefully revised as follows:

• Please adjust the order of cited references to be compatible with the list of references. The numbers are not compatible with the list of references; for example reference #11 in the list is not cited in the right place in the manuscript text.

Author Response

Please see the attachment.

Author Response File: Author Response.pdf