The characterisation of the protective film formed by benzotriazole on the 90/10 copper–nickel alloy surface in H2SO4 media

A review of the effects of benzotriazole on the corrosion of copper and copper alloys in clean and polluted environments

“…Besides, it was shown that BTAH is the only inhibitor that provides effective protection of copper archeological artifacts during preservation process [49,52]. For example, it was shown that BTAH can completely inhibit the corrosion of cupronickels in salt water [4,18,19,53] as well as in acidic [37,54,55] environments. Based on enthalpy of adsorption calculations, these studies showed that the obtained values agreed very well with the value obtained for pure copper in the same media.…”

“…Some other studies were devoted to copper-nickel alloys with the interest has been focused mainly on the role of iron, added either as ferrous sulfate or as an alloying element, in the formation of a protective layer of hydrated ferric oxide that protects the metal against corrosion [93,94]. The nature of the protective film formed by benzotriazole (BTAH) on the surface of the Cu10Ni alloy in deaerated 0.5 mol L -1 H 2 SO 4 solution containing Fe(III) ions as oxidant was investigated by weight-loss, calorimetric measurements, and by surface-enhanced Raman spectroscopy (SERS).…”

Surface-enhanced Raman scattering (SERS) on copper electrodes in 1-n-butyl-3-methylimidazoliun tetrafluorbarate (BMI.BF4): The adsorption of benzotriazole (BTAH)

“…It was already well established that a protective film is formed on copper and its alloy surfaces which is responsible for the corrosion inhibition processes. This protective film was characterized by surface-enhanced Raman spectroscopy (SERS) as composed by a polymeric complex, [Cu(I)BTA] n , in copper [10], CuZn [11], and CuNi [12] alloys (see Scheme 1).…”

Electrochemistry and surface analysis of the effect of benzotriazole on the cut edge corrosion of galvanized steel

“…Its inhibiting properties have been attributed to the formation of a polymeric film with monovalent copper [4] -[Cu(I)-BTA] n -in neutral pH, or to physical adsorption onto the copper surface in acidic environment [5]. Although the equilibrium BTAH ↔ BTA − + H + favours the presence of the neutral form in acidic media, a shift of the equilibrium may occur due to the formation of copper complexes [6][7][8][9]. Benzotriazole also seems to act on other substrates, like aluminum [10,11], stainless steel [12,13], iron [14,15] and zinc [5,16].…”