Inhibiting effect of some dyes on corrosion of aluminum and aluminum-alloys in hydrochloric acid

The inhibiting effect of some dyes [fast blue R.R. salt, fast blue B.B. salt, fuchsine base, crystal violet and rhodamine G 6] on the corrosion of pure aluminum and two types of its alloy [Al-Mg-Mn and Al-Mg] in 0.5M HCI has been studied using potentiodynamic polarization method and open-circuit potential measurement.Comparison of the inhibitive efficiencies of different dyes in 0.5M HCI for pure Al has shown the following order Crystal violet