Microstructure and corrosion behaviour of Al coating deposited by cold spraying onto FSW AA2219-T87 joint

ABSTRACT

This work evaluates the microstructure and corrosion behaviour of Al coating deposited by cold spraying onto FSW AA2219 alloy. The results showed that a dense coating could be deposited on the FSW joint surface with low porosity (0.77%). XRD analysis indicated that no new phases were formed during the spraying. Refined grains were observed in the coating as expected by SEM results. Electrochemical tests revealed the coating had positive corrosion resistance performance. Immersion tests confirmed that the coating effectively withstood the corrosion attack in an aggressive environment and a typical intergranular corrosion can be observed in the surface of the coating particles.

KEYWORDS:

• Aluminium alloy
• cold spraying
• friction stir welding
• LEIS
• intergranular corrosion

Acknowledgements

The author would like to thank Xi’an Jiaotong University for cold spraying technical support.

Disclosure statement

No potential conflict of interest was reported by the authors.

Notes on contributors

Changyu Zhao is a master student in Mechanical Engineering at Beijing Institute of Petrochemical Technology of China. His field of expertise is in friction stir welding, corrosion and material protection. He has participated in nine national and international congress for sharing the results of his investigations.

Hua Zhang is a professor in Mechanical Engineering at Beijing Institute of Petrochemical Technology of China. His field of expertise is in friction stir welding, corrosion and material protection. She has participated in severial national and international congress for sharing the results of his investigations. She has published more than 40 papers in total.

Tongge Shao is a master student in Mechanical Engineering at Beijing Institute of Petrochemical Technology of China. His field of expertise is in laser welding and friction stir welding.

Chengliang Dou is a master student in Mechanical Engineering at Beijing Institute of Petrochemical Technology of China. His field of expertise is in friction stir welding.

ORCID

Changyu Zhao http://orcid.org/0000-0002-3089-5912

Additional information

Funding

This work was supported by the National Natural Science Foundation of China (51774047) and The Great Wall Scholars Programme of Beijing (CIT&TCD20170309).