Influence of 8-hydroxyquinoline addition on the corrosion behavior of commercial Al and Al-HO411 alloys in NaOH aqueous media

The effect of 8-hydroxyquinoline (8HQ) on the corrosion inhibition of commercial Al and Al-HO411 alloys has been investigated in NaOH solutions. Results showed that the inhibition efficiency was increased with increasing concentration of 8HQ. Al-HO411 alloy exhibited higher corrosion resistance and inhibition efficiency than the commercial Al. Examination of both samples was studied by means of optical microscope as well as energy-dispersive X-ray spectrometer. The crystallographic structure of both samples was analyzed by means of X-ray diffractometry. It was observed that protective films are formed on the surfaces that play an essential role in the corrosion inhibition of the alloys under investigation.

► The corrosion of commercial Al alloy is higher than that of Al-HO411 alloy.
► The inhibition efficiency increases with the increasing of 8-hydroxyquinoline (8HQ) concentration.
► The inhibition efficiencies of Al-HO411 samples are higher than those of commercial Al.
► The 8HQ is promising candidate to be added to the coating systems as active anti-corrosive component for corrosion protection of both alloys.