Surface modification of magnesium alloys using thermal and solid- state cold spray processes: Challenges and latest progresses

•Diverse surface modification techniques for Mg and its alloys are introduced.•Mechanical, tribological and corrosion behavior of thermal sprayed coatings are presented.•Benefits and restrictions of the cold spray (CS) process are introduced.•The latest development of cold spray (CS) process for industrial applications is presented.•Bonding mechanism at the Mg alloy/cold sprayed layer interface is introduced.