Carbon fibers reinforced magnesium matrix composites (Cf/Mg composites) have been broadly utilized in various domains due to their advantages of low density, excellent specific strength, and specific stiffness . There is an increasing interest in the use of Cf/Mg composites as structural materials for applications in aerospace and automotive industries where weight reduction is a critical factor, such as,the shell of rocket engines, the parabolic antenna skeleton of satellites,the automobile engine piston and the space anti-radiation components,etc. However, there is a big challenge in an exposure to moisture
or saline environments because of a low standard electrode potential for magnesium-based materials. Cf/Mg composites are extremely vulnerable to be corroded. After corrosion, corrosion pits will appear on the surface of Cf/Mg composites, which will decrease the mechanical performance and greatly limits further applications. Additionally,regarding the Cf/Mg composites, severe micro-galvanic corrosion will occur between carbon fibers and magnesium substrate, causing a higher active state of Cf/Mg composites than magnesium alloys under the same corrosive conditions. As a result, Cf/Mg composites have a worse corrosion resistance than magnesium alloys. To solve this problem, application of coatings is one of the effective methods for the corrosion protection of Cf/Mg composites .
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