Effects of nanosized TiC and TiB2 particles on the corrosion behavior of Al-Mg-Si alloy

•Al matrix composites reinforced with different nanoparticles were investigated.•The corrosion behaviors of the composites were related to the passive film.•TiCp were beneficial for improving the corrosion behavior, but TiB2p were not.•TiCp reduced the grain boundary phases, improving the corrosion behavior.•TiB2p at grain boundaries form more corrosion channels, increasing the corrosion rate.