Corrosion and corrosion inhibition of Al and some alloys in sulphate solutions containing halide ions investigated by an impedance technique

The Influence of Transition Metals Addition on the Corrosion Resistance of Nanocrystalline Al Alloys Produced by Mechanical Alloying

“…In the current study, n values vary from 0.96 to 0.99, so the constant phase elements (CPEdl) indicates double layer capacitors with some pores, i.e., the passive film formed on Al alloy surface is non homogenous with little porosities [36]. Alternatively, CPEf represents Warburg impedance (W) due to its n value between 0.51 to 0.61, which agrees the passivity of the surface of Al alloys in 3.5% NaCl and the mass transport is restricted by the development of surface corrosion products and/or oxide film [37]. It is seen that in most cases, the value of Rf is higher than the resistance of double layer Rct.…”

Outstanding inhibitive effect of colchicine on aluminium alloy 6061 corrosion

“…The aggressive chloride ions penetrates through the oxide film and breakdown the aluminium oxide formed on the metal surface [27]. Then the adsorbed chloride ions reacts with Al 3+ in the oxide lattice and results in the formation of oxychloride complexes, Al(OH) 2 Cl 2 ─ [28][29][30][31]. The oxychloride complex reduces the stability of oxide film and intensifies the dissolution rate of aluminium [20].…”

“…The corrosion resistance behaviour develops from the ability of metal to form a natural oxide film on its surface [2,3]. However, the localized corrosion takes place in an aggressive chloride medium and it leads to the breakdown of passive layer and resulted in pit formation [4,5].…”

Adsorbtion and inhibition effect of thiourea on mild steel in acidic media

“…It shows that the molecules of inhibitor act by adsorption at the solution metal interface [12]. The capacity of an organic coating is given by the formula:…”