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Commont:It is advised to present the porosity by an independent method like BET, since you use the porosity obtained by electrochemical test results to interpret the corrosion made by the same electrochemical method.

Response: Special thanks to you for this good advice that we have honestly considered. We have been looking for ways to improve the quality of this part and we would like to explain some of our research ideas with you.
     BET: We have given serious consideration to this method you advised. The method has been widely used in powder materials, especially in ultrafine powders and nano-powder materials. There is some debate, however, as to whether the method could truly reflect the porosity of MAO coating systems. The BET measurement requires collected power samples, which can¡¯t be realized in our systems since the loose coating structures has been destroyed during the sample preparation (We try to scrape it off from the substrates or use solution to peel it off) and the intact free-standing coatings samples can¡¯t be preserved. Unlike other power samples, the pores in our MAO coatings is of the micron scale. The coating/substrate system is like a ¡°sponge¡±, and the pore information would be lost if the intact sponge is torn.
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