Microstructure and Corrosion Behavior of Friction Stir Welded Al Alloy Coated by In Situ Shot-Peening-Assisted Cold Spray

• 来源期刊: 金属学报（英文版）
• 年，卷（期）: 2020,（1）
• 页码范围: 172-182
• 页数: 11页
• 语种: 英文

摘要

To improve the corrosion resistance of friction stir welded (FSW) joints,in situ shot-peening-assisted cold spray coating was applied to the surface of FSW joints.The microstructure and corrosion behavior of the coatings were investigated.The results showed that a dense coating was obtained by cold spraying technology.Moreover,the use of in situ shot-peening-assisted technology significantly reduced the porosity of the coating,which has a positive impact on the microstructure and the mechanical performance.Exfoliation corrosion tests showed that the coating affected positively on the corrosion resistance.On the coated surface,the craters caused by shot-peening particles were corroded in the form of exfoliation corrosion,while the exposed particles were corroded in the form of intercrystalline corrosion.This work provides a new approach to the corrosion protection of FSW joints.