**4. Conclusions**

CS Ti coatings improved the hardness and wear behavior of Mg alloys compared to CS Al coatings. AZ31B coated with Ti coating showed the much better corrosion resistance than Al-coated Mg alloy in 3.5 wt % NaCl solution. AZ31B and Al-coated AZ31B were most vulnerable to pitting corrosion, while Ti-coated Mg alloy indicated extraordinary resistance to pitting in chloride containing electrolyte. Compared to CS Al coating, cold sprayed commercially pure-Ti coating exceptionally increased the repassivation ability of Mg alloys. Moreover, immersion test for 11 days further elucidated the effectiveness and corrosion protection performance of HPCS Ti coatings on Mg alloys in corrosive solutions.

**Author Contributions:** Conceptualization, M.D.; methodology, A.K.K., M.U.F.K. and C.M.K.; validation, A.K.K., M.U.F.K., P.L.M. and R.K.G.; formal analysis, M.D., A.K.K., M.U.F.K., P.L.M. and R.K.G.; investigation, M.D. and M.U.F.K.; resources, P.L.M., C.M.K., M.M. and R.K.G.; data curation, A.K.K., M.U.F.K., P.L.M. and R.K.G.; writing—original draft preparation, M.D., A.K.K. and M.U.F.K.; writing—review and editing, M.D., A.K.K., M.U.F.K., P.L.M., C.M.K., M.M. and R.K.G.; visualization, P.L.M.; supervision, M.D., P.L.M. and R.K.G.; project administration, M.D., C.M.K. and M.M.; funding acquisition, C.M.K., M.M. and R.K.G. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research was funded by National Science Foundation, gran<sup>t</sup> number NSF-CMMI 1846887.

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** Data sharing not applicable.

**Acknowledgments:** The authors would like to acknowledge the ASB Industries, Inc for providing facilities and support. R. K. Gupta acknowledges the financial support from the National Science Foundation (NSF-CMMI 1846887) under the direction of Alexis Lewis. M. Misra duly acknowledges the startup fund from the University of Nevada: Reno.

**Conflicts of Interest:** The authors declare no conflict of interest.
