摘要：The present work investigates corrosion behaviour of the aluminium in 0.5 M NaOH solution in the presence of Azwain (Trachyspermum copticum) seed extract by weight loss and electrochemical techniques. Experimental results revealed that inhibition efficiency increases with increasing inhibitor concentration and reached at maximum 94% at 500 ppm inhibitor concentration. Adsorption of inhibitor molecules on the surface of aluminium followed Langmuir adsorption isotherm model. Tafel polarization analyses indicated that studied compound is mixed type inhibitor. The data obtained from polarization method and weight loss methods were in good agreement. The Azwain (Trachyspermum copticum) seed extract is environmental friendly, biodegradable, nontoxic, cheap and easily available source of material which is used as corrosion inhibitor for aluminium metal in 0.5 M NaOH.
