Adsorption of 5-alkyl-3-amino-1,2,4-triazoles from aqueous solutions and protection of copper from atmospheric corrosion

Чиркунов, А. А.; Kuznetsov, Yu. I.; Шихалиев, Х. С.; Agafonkina, M. O.; Andreeva, N. P.; Kazansky, Leonid P.; Potapov, A. Yu.

doi:10.1016/j.corsci.2018.08.056

Cited by 19 publications

(22 citation statements)

References 28 publications

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“…It can be assumed that the 3-AT molecule is in an upright position in the monolayer, and 2-MBT is adsorbed in a more planar manner by forming bonds with the copper surface through a nitrogen atom and an exo-sulfur atom. This regularity also repeats on the oxidized surface of copper: 3-AT is vertically located in a monolayer [12] whereas 2-MBT is in a more slanted position [22]. Gravimetric corrosion tests on MNZh 5-1 plates showed that at C in = 0.50 mmol/l, the corrosion rate is reduced 5-fold by 2-MBT and 4-fold by 3-AT.…”

Section: Inhibitor Corrosion (Ci)mentioning

confidence: 78%

“…Adsorption of organic CIs, for example, various azoles [11-13, 18, 22, 25-29], from a borate buffer solution with pH 7.40 on copper was mainly studied in situ by ellipsometric method at an electrode potential of E = 0.0 V. The adsorption studies was often supplemented by results of studying the composition of passivating layers on copper ex situ by the XPS method [12,22,25,26,28,29]. It was recently shown [28] that additional information on the adsorption of azoles on copper can also be obtained by another in situ method -EIS whose measurement results are consistent with ellipsometric adsorption measurements.…”

Section: Coppermentioning

confidence: 99%

“…The most widely used CI for copper is 1,2,3-benzotriazole (BTA), which has been known in this function since 1947 [3]. Extensive research and practical application of BTA, as well as other triazoles, have been repeatedly covered in the literature and is currently continuing [4][5][6][7][8][9][10][11][12][13][14]. Recently, however, CIs for copper belonging to the class of triazoles have been criticized because of their high toxicity.…”

Section: Introductionmentioning

confidence: 99%

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Adsorption of 2-mercaptobenzthiazol on copper and MNZh-5-1 alloy and their protection from corrosion in aqueous solutions

2020

Int. J. Corros. Scale Inhib.

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The adsorption, passivation and protective properties of 3-amino-1,2,4-triazole (3-AT) and 2mercaptobenzothiazole (2-MBT) on copper and MNZh 5-1 alloy were studied. The adsorption characteristics of both compounds on reduced and oxidized surfaces of copper and its alloy were calculated. On oxide-free surfaces (Е =-0.60 V) of both metals, physical adsorption of 3-AT and 2-MBT occurs, whereas chemical adsorption occurs on oxidized surfaces (Е = 0.0 V). The free energies of adsorption calculated by two independent methods, ellipsometry and electrochemical impedance spectroscopy, correlate well with each other. The orientation of the studied compounds on the metal surface was revealed by the ellipsometric method. 2-MBT on reduced and oxidized surfaces of the MNZh 5-1 alloy and copper is adsorbed in planar orientation, forming bonds with the surface through sulfur and nitrogen atoms. 3-AT on cathodically reduced surface of the alloy and copper is in planar orientation, whereas at the anodic potential, in a nearly vertical orientation. 2-MBT is adsorbed on oxidized copper better than 3-AT, apparently due to interaction with its oxide. It allows a protective coating to be formed on the surface that protects the metal well even at high chloride concentrations. Corrosion tests of copper and its alloy in 3.5% sodium chloride solution confirmed the high protective properties of 2-MBT. The created inhibitor mixture of 2-MBT with sodium laurate in equimolar ratio at a total concentration of 0.20 and 0.25 mmol/L allows one to achieve almost complete protection of copper and its alloy with Z = 99.1-99.3%, respectively.

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Section: Inhibitor Corrosion (Ci)mentioning

confidence: 78%

Section: Coppermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Adsorption of 2-mercaptobenzthiazol on copper and MNZh-5-1 alloy and their protection from corrosion in aqueous solutions

2020

Int. J. Corros. Scale Inhib.

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“…The experiment carried out without the derivatives of 5-amino-1H-1,2,4-triazole demonstrated that the peak current density of +0.35 V was present in the anodic region of the polarisation curve, which then shifted to the passivation region with E act ≈ +0.71 V. For inhibitors A-C, the potential E act shifts to the anodic region at any concentration studied. This fact is considered in [32,33] as the inhibition effect of the additive. The potential E act increases with the additive concentration.…”

Section: Resultsmentioning

confidence: 99%

3-Sulphinyl-5-Amino-1H-1,2,4-Triazoles as Inhibitors of Copper Corrosion

et al. 2019

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A set of electrochemical and full-scale corrosion testing methods demonstrates that 3-sulphinylalkyl-5-amino-1H-1,2,4-triazoles can be used as inhibitors of copper corrosion in neutral chloride solutions and under atmospheric corrosion. It was shown that the inhibition effect of 3-sulphinylalkyl derivatives of 5-amino-1H-1,2,4-triazole increases with the growth of the chain of the additive. By means of the impedance spectroscopy method, the authors determined that the polarisation resistance and the Warburg impedance increases whereas the double-layer capacitance decreased with the growth of the inhibitor chain and the concentration of the inhibitor. In addition, the period when the first signs of corrosion attack appear on the copper plates in the salt spray chamber increased with the growth of the inhibitor chain and its concentrations. The lowest value of this period was measured for 3-sulphinylpropyl derivatives. However, it is still 12 times higher that this value measured without any inhibitors. Full-scale testing in 1% HCl solution showed that the corrosion rate slows down by 10–20 times upon the introduction of the derivatives of 3-sulphinylbutyl and 3-sulphinylpentyl at a concentration of ≥5.00 mM. If the concentration of 3-phenethylsulphinyl is equal to or higher than 1.00 mM, then the protection level is about 85%.

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“…The problem of inhibiting the corrosion of metallic construction materials, such as copper and iron alloys, is currently being successfully solved using corrosion inhibitors designed for various media and materials [1][2][3][4][5]. The inhibitory effect of the inhibitors is usually associated with the deceleration of electrode reactions due to the shift of the redox potential of the system [1], or due to the formation on the metal surface of nano-sized protective layers that isolate the protected metal from the corrosive environment [2][3][4][5].The latter principle is the most universal one for the protection of a wide range of materials since the shielding effect of the inhibitor is largely insensitive to the electrochemistry of metal corrosion dissolution. Unfortunately, the effect of such layers may be limited in time and often requires the permanent presence of an inhibitor in the solution to maintain the layers integrity.…”

Section: Introductionmentioning

confidence: 99%

The effect of cathodic current density on the protective properties and cracking tendency in Co–Cr–W coatings

2019

Int. J. Corros. Scale Inhib.

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The paper shows that a change in the cathodic current density has a significant impact on the cracking tendency, through porosity and protective properties of coatings. As the cathodic current density increases, the ability to cover in cracks formed at the early stages of the process decreases during further electrolysis. It was established that the coating under investigation exhibits the best physico-mechanical characteristics when tungsten content is the highest. Moreover, in this case, we should expect an improvement in the corrosion properties. The highest hardness value is observed when tungsten content is high. The porosity of the coatings, determined by standard filter paper method, decreases when heat treatment is carried out for 2 hours at 200°C in air. It is shown that a change in current density within the range of 0.15-0.45 A/cm 2 does not have a significant effect on the composition and hardness of the coatings. Long-term corrosion tests of the investigated Co-Cr-W coatings in simulated physiological medium (Hank's solution) were carried out. Mass and deep corrosion indicators/readings and corrosion severity/resistance scores were calculated gravimetrically. The corrosion behaviour in Hank's solution in the area of anodic potentials was studied. It is shown that the coating under investigation has an extended passive region/area, up to a potential of 1.2 V relative to a standard hydrogen electrode. The total/complete passivation current on the potentiodynamic polarization curve did not exceed 0.1 mA/cm 2 . The dissolution of the alloy, accompanied by the appearance of a yellow colour, occurred only at positive potentials exceeding ~1.3 V. This coating has a higher corrosion resistance in biological and chloride-containing media, compared to chromium coatings not (doped) with other metals (Ni, Co, Mo, W) or non-metals (P, B, C).

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Adsorption of 5-alkyl-3-amino-1,2,4-triazoles from aqueous solutions and protection of copper from atmospheric corrosion

Cited by 19 publications

References 28 publications

Adsorption of 2-mercaptobenzthiazol on copper and MNZh-5-1 alloy and their protection from corrosion in aqueous solutions

Adsorption of 2-mercaptobenzthiazol on copper and MNZh-5-1 alloy and their protection from corrosion in aqueous solutions

3-Sulphinyl-5-Amino-1H-1,2,4-Triazoles as Inhibitors of Copper Corrosion

The effect of cathodic current density on the protective properties and cracking tendency in Co–Cr–W coatings

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