Galvanic Corrosion Performance of an Al–BN Abradable Seal Coating System in Chloride Solution

Round 1

Reviewer 1 Report

In my opinion, the manuscript is well written and could be published in its present form.

Author Response

Thank you very much for giving us a chance to revise our paper.We have carefully addressed the issues raised by reviewers point by point, and the corresponding changes are also highlighted in the revised paper.

Reviewer 2 Report

Dear author, the paper has 42% of plagiarism. Please explain this high degree of similarity. There some minor English errors that should be revised. The quality of the figure 9 and 10 must be improved. 

Author Response

Thank you very much for giving us a chance to revise our paper.The candid comments and suggestions from you and reviewers are helpful for us to improve our work.

1, For the plagiarism problem in the paper，we are very sorry for it, because we are not aware of our expression when writing. In the revised paper, we have modified the expression carefully.

2, There some minor English errors that should be revised.Thanks for the reviewer's comment. We are so sorry for the errors of English. In the revised paper, we checked the English carefully, and have corrected the wrong words.

3,The quality of the figure 9 and 10 must be improved. It has been modified in the revised paper.

Reviewer 3 Report

The aim of the work was to investigate the corrosion phenomena of the Al BN abrasive coating system.

The presented research results and discussion are of very good quality.

However, I have a few doubts:

1. In dynamical systems (compressor section of a gas turbine) the system works on the motion.
2. The gas flow and the forces acting on the coated parts are high.
3. The operating temperature of the system varies widely.
4. Stresses arise in the parent material and in the coating system.
5. Such conditions result in the partial removal of corrosion products.
6. The corrosion products in the system begin to act as an abrasive. 
7. The mentioned factors affect the corrosion process itself and its dynamics.

The entire corrosion phenomenon, although very well described by the Authors, is more complicated than it seems. Therefore, corrosion tests conducted under static conditions (no sample movement, no gas flow, no liquid flow) cannot relate to the actual compressor operating conditions.

Despite the doubts, I consider the article valuable. In my opinion, the work is suitable for publication in Coatings.

Yours faithfully,
reviewer

Author Response

Thank you very much for giving us a chance to revise our paper. The candid comments and suggestions from you and reviewers are helpful for us to improve our work.

Generally,there are two typical corrosive environments for the abradable materials in aero-engine. The first one is the working condition with complex environmental factors that affecting the corrosion, such as high-temperature and high-speed gas flow, under this situation, oxidation failure and erosion are the leading corrosion form for the abradable seal coating. The second environment is the ground parking condition under marine atmosphere. During the atmospheric exposure, electrochemical corrosion under a normal-temperature and static conditions is the main degradation mechanism for abradable coatings.  In this work, we pay close attention to the corrosion performance of abradable materails during idle time.To some extent, it is also valuable for the anti-corrosion design of abradable coatings.

In the revised paper, we have considered the reviewer’s suggestion in some way， and explained the topical of this work in detial. 

Round 2

Reviewer 2 Report

Dear authors, 

The plagiarism percentage is still 40%, unfortunately.