Ultrasonic nanowelding technique was used to coat silicon carbide (SiC) particles on aluminium (Al) substrate. Both sparse SiC particles and dense particle coating layers were fabricated on Al surface. Detailed analysis shows that SiC particles are bonded and compacted well with the Al surface after the ultrasonic nanowelding process, but no structural transformation and chemical combination at the interface between SiC and Al were observed. The samples of the SiC coatings nanowelded on Al surface possess high hardness, and bigger SiC particle size results in higher hardness values. Corrosion tests reveal that the corrosion resistant properties of Al are improved with the nanowelded SiC coatings. (C) 2012 Elsevier B.V. All rights reserved.