There are several major concerns on this research work needed to be clarified by the authors: 1. Considering HVOF is a kind of surface engineering technology, it can be effectively applied on large engineering components. However, it is not probable to conduct post heat treatment for the large engineering components with the HVOF coatings. The authors should justify the possibility. 2. The corrosion resistance (both Ecorr and Icorr) of S1000 is the best while the cavitation erosion resistance of S800 is the highest. What are the reasons for such observations? The synergistic effect (corrosion induced erosion and erosion induced corrosion) for the annealed samples in artificial seawater seems to be important. It is expected the authors should revisit the cavitation erosion-corrosion behavior of the annealed samples. The references for synergism of cavitation erosion-corrosion should be included.