Comparative Study of Inhibition Effects of Benzotriazole for Metals in Neutral Solutions As Observed with Surface-Enhanced Raman Spectroscopy

Abstract

Surface-enhanced Raman spectroscopy has been successfully extended to the study of corrosion inhibition of bare iron and nickel metals. The inhibition effects of benzotriazole (BTAH) for copper, iron, and nickel electrodes in 0.1 M KCl solution were investigated by using both polarization curves and in situ Raman techniques. The protective films formed on copper and iron surfaces, in the presence of BTAH, are characterized as [Cu I BTA]n and [Fe II (BTA)2]n, respectively. The formation of Fe-N coordinated bonds and the deprotonation of the triazole ring may occur while BTAH interacts with the iron surface. On the contrary, BTAH may interact with the nickel surface as neutral molecules in the whole potential range investigated resulting in a poor inhibition effect. The surface complex is characterized as [Ni-BTAH]. The potential dependence of the Raman spectra on copper and iron shows that the BTAion in the surface complex may rebind with H + at more negative potentials and accordingly the inhibition efficiency of benzotriazole decreases.

Chemical Mechanical Polishing of Stainless Steel as Solar Cell Substrate

“…As can be seen from curves (b)-(d), with the increase in the BTA concentration, when the applied potential is in the range of E corr +100 mV and ∼0.7 V (vs. E Ag/AgCl ), the anodic current density gradually decreases, which indicates that, under this condition, BTA can form a passivating layer on the top surface and thereby can inhibit the oxidation. [38][39][40][41]43 The XPS N(1s) spectra of the 316L stainless steel surface after being polished with the slurries containing different concentrations of BTA are shown in Fig. 12.…”

A Study of <i>Eruca vesicaria</i>, <i>Bromelia hemisphaerica</i> and <i>Erythrina americana</i> as Green Corrosion Inhibitors for Carbon Steel in Sulfuric Acid

“…It is well known that OH −1 can passivate the steel protecting it against corrosion, reacting with Fe 2+ ions to form Fe(OH) 2 responsible for the steel passivation. Amine is also well known to form a good passive film on metals to protect steel from corrosion, and it can be protonatedto give NH 3+ to react with Fe(OH) 2 to give FeONH 2+ + H + , and probably the FeONH 2+ complex, equations [3] and [5] is the one which remains on the steel surface to protect it. …”

“…as acid pickling, well oil acidizing, metals and alloys are exposed to corrosive environments such as sulfuric acid (H 2 SO 4 ), hydrochloric acid (HCl) and phosphoric acid (H 3 PO 4 ) among others, which causes corrosion [1]- [3]. Among the different ways to protect metals against corrosion, the use of corrosion inhibitors is one of the most widely used methods [4]- [6].…”

The Unexpected Role of Benzotriazole in Mitigating Magnesium Alloy Corrosion: A Nucleating Agent for Crystalline Nanostructured Magnesium Hydroxide Film

“…13 Studies conclude that pH value of the electrolytes has a negligible impact on the inhibiting effectiveness of BTA for Cu. 13,15 BTA can coordinate with Cu cations (either Cu + or Cu 2+ ) in the form of BTAH (acidic or neutral pH) or BTA − (alkaline pH) via Cu-N bonding.…”

“…2,3 Whilst a corrosion protection strategy will differ based on the ultimate application, the utilization of corrosion inhibitors is one method to regulate the corrosion of metals, including Mg alloys, for a range of scenarios that may include aqueous exposure, or for incorporation into primers. Benzotriazole (BTA, whose chemical structure is illustrated in Figure 1) has been extensively studied as inhibitor to regulate corrosion kinetics of iron (Fe) and steel, 12,13 copper (Cu), [13][14][15][16][17] nickel (Ni), 13 Al, 18,19 and zinc (Zn) 20,21 by the formation a protective surface film. After about four decades of investigation, [13][14][15][16][17] it is well recognized that anodic Cu dissolution is mitigated by the formation of a protective film consisting of insoluble compound of Cu + -BTA − with a reported low pK sp value of 11.4 in aqueous solution.…”