Green Corrosion Inhibitors from Agri-Food Wastes: The Case of Punica granatum Extract and Its Constituent Ellagic Acid. A Validation Study
Round 1
Reviewer 1 Report
Report for the article:
Green Corrosion Inhibitors from Agri-food Wastes: the Case of Punica granatum extract and its 4 Constituent Ellagic Acid. A validation study
This paper evidences the use of Ellagic acid and fermented pomegranate waste (FPW) as corrosion inhibitors for Armco pure iron in HCl solutions. The corrosion measurements are made by the use of several electrochemical techniques and gravimetric analyses while Spectrophotometric analyse are used to characterize.
Remarks
The summary does not fully present the conclusions that were found on the basis of the conducted research. Complete the summary with this information.
Page 4, line 155 Eq.3 is not correct
The results of the potentiodynamic polarization tests should be shown in the table.
The results reveal that upon corrosion new compounds are formed onto the exposed areas of the treated samples. (This phrase must be joint with the names and formulas of new compounds which is not attested clearly in the manuscript?)
Put the value of scan rate for potentiodynamic polarization which is not in the text.
The conclusions are presented in a correct and clear way.
Author Response
Please see the attachment.
Author Response File: 
Author Response.pdf
Reviewer 2 Report
In this work authors have carried out the validation of the application of Ellagic Acid from Punica granatum extract in order to clarify and reinforce the data published so far inthis respect. The whole manuscript is well organized and the experiments and results adequately described. Based on that the article reaches the standards to be published in the journal Processes after the following minor changes were amended.
- Line 41: Please reorganize the references as ”[2-5]”.
- Line 137: ”0.2 cm diameter”.
-Uncertainty of slope and intercept of calibrations curves should be included in order to guarantee the reliability of the provide data.
Author Response
Please see the attachment.
Author Response File: Author Response.pdf
Reviewer 3 Report
Manuscript No. processes-721733
Corrosion inhibition effect induced by ellagic acid and an extract from wastes of fermented pomegranate to corrosion of Armco iron is presented. Polarization curves were recorded in both 0.05 M HCl and 0.05 NaCl solutions, whereas mass loss tests were performed only in 0.05 M HCl. The work is completed by appropriate conclusions. This manuscript is sufficiently novel and interesting to warrant publication.
However, I have some observations and suggestions, as following:
Regarding mass loss tests, I wonder if the 1 h time of immersing in stagnant solution is sufficient for obtaining accurate corrosion rate ? For a sample surface of ca. 8 cm2, this means 1-8 mg losses leading to weighing errors. It must mention the weighing equipment. Have the authors made tests for longer periods of time?
The authors need to shorten the conclusions; as a recommendation, repeating the results and citations of other authors should be avoided.
Also, everywhere in the manuscript, write ‘experiments’ (instead ‘experimentations’); write ‘mL’ instead ml also, write ‘concentration’ of an additive instead of ‘amount’.
Some typo or grammar errors:
Title: write all words with uppercase (if necessary)
Abstract, line 20: ..was validated.; line 21: ..small concentrations of..; line 22: ..extract containing ca. 10 and 100 µM EA was..
Introduction, line 59: ..ethical concerns.; line 101: .. potentiodynamic polarization investigation.
Materials and Methods, line 110: ..cut in the same forms of rod and plate, respectively.; line 111: .. cleaned with acetone and dried.; line 113: check the company name, Perla Alba???; line 128: ..UV-360 Plus..; line 131: ..different concentrations of ellagic..; line 145: ..a dryer for..; line 146: ..The mass (expressed in grams) was compared..
Results and Discussion, line 185: ..a preliminary stage..; line 189: ..in 0.05 M HCl..; lines 208, 390 and 404: .. points out to..
Figures 2: in the abscissa, the numbers must be written as 4; 8; 12 (avoiding E-06)
Line 216: .. iron immersed in HCl solutions..; line 227: ..coupons immersed in..; line 274: .. the polarization allows..
Figures 3 and 4: in the abscissa, write the values of log i (A cm-2) instead of i (avoiding E-07, E-06, etc.). Attention! Similar observations for Figs S2, S3 and S4 from supplementary material.
Lines 296 and 376: Potentiodynamic polarization curves (Tafel curves, scan rate…); lines 299 and 378: ..different concentrations of..; line 300: The Tafel curves recorded…
Line 345: ..0.05 M NaCl solution..
References:
Write titles of all published papers in lowercase (see refs 3, 5, 8, 12, 15, 17, 19, 23 and 25)
Write titles of books in uppercase (see ref. 11)
Delete (February 20th 2014) in ref. 7
Author Response
Please see the attachment.
Author Response File: Author Response.pdf
