In this paper, graphene-coated Al powders prepared by in situ reduction method were directly used for cold spraying, obtaining a graphene-reinforced Al matrix composite coating with more compact structure and better performance. Cross-sectional analysis revealed that compared with the pure Al powders, the graphene-coated Al powders were more severely deformed, and the resulting coating was denser and its porosity was reduced by over 80%. The hardness of the graphene-coated Al coating was increased by 40%, and its brine immersion time was prolonged by nearly three times. However, the graphene increases the pitting sensitivity of the Al coating; so, the enhanced corrosion resistance of the graphene-coated Al coating is mainly attributed to the improvement of its structure densification.

    Abstract
    1 Introduction
    2 Experimental
    3 Results and discussion
    4 Conclusions
    Acknowledgements 
    References

• Liuyan Zhang(School of Materials and Energy, Guangdong University of Technology)
• Xiujin Wang(School of Materials and Energy, Guangdong University of Technology)
• Huishu Wu(School of Materials and Energy, Guangdong University of Technology)
• Yongjin Mai(School of Materials and Energy, Guangdong University of Technology)
• Cansen Liu(School of Materials and Energy, Guangdong University of Technology)
• Xiaohua Jie(School of Materials and Energy, Guangdong University of Technology)