Inhibition of Copper Corrosion with N -Arylaminotriazoles in Aqueous Chloride Solutions and in Air
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IED ELECTROCHEMISTRY AND METAL CORROSION PROTECTION
Inhibition of Copper Corrosion with N-Arylaminotriazoles in Aqueous Chloride Solutions and in Air D. S. Shevtsova, Kh. S. Shikhalieva,*, E. S. Komarovaa, A. A. Kruzhilinb, G. O. Kipriyanovaa, A. Yu. Potapova, I. D. Zartsyna, O. A. Kozaderova, Ch. Prabhakarc, and A. Tripathic Voronezh State University, Voronezh, 394018 Russia Voronezh State Agrarian University, Voronezh, 394087 Russia c National Institute of Technology, Kurukshetra, Haryana, 136119 India *e-mail: [email protected] a
b
Received May 21, 2019; revised March 16, 2020; accepted May 25, 2020
Abstract—A series of 3-(N-arylamino)-5-amino-1Н-1,2,4-triazoles were prepared by the reaction of S,S-dimethyl cyanodithioimidocarbamate with appropriate anilines. The inhibiting effect of the products on the corrosion of copper of M1 grade in acidic and neutral chloride-containing media was studied using electrochemical and accelerated electroless methods. The maximal degree of protection ensured by commercially available 3,5-diamino1H-1,2,4-triazole and the synthesized 3-phenylamino, 3-(4-methylphenylamino), 3-(4-chlorophenylamino), and 3-(3-chlorophenylamino) derivatives of 5-amino-1Н-1,2,4-triazole reaches 70–87%. In acid solutions, the synthesized compounds show higher performance than the 3,5-diamino derivative, ensuring up to 92–96% protection. Similar results were obtained in experiments in a salt fog chamber. Keywords: in situ synthesis, copper, corrosion inhibitors, chlorides, 3-(N-arylamino)-5-amino-1Н-1,2,4-triazoles DOI: 10.1134/S1070427220080078
Organic corrosion inhibitors are widely used for reducing the corrosion rate in operation of metal items in various media. Azoles are widely used for the protection of copper and its alloys [1, 2]. Despite a large set of the already known compounds with the proved protective effect, synthesis of new promising corrosion inhibitors for a specific metal in a specific medium and of versatile inhibitors for a series of metals and alloys used under various conditions is still a topical research field [3, 4]. Among azoles, 1,2,3-benzotriazole is the most studied copper corrosion inhibitor [5–7]; it is still widely used for the protection of nonferrous metals. However, not only benzotriazole derivatives, but also some other, more hydrophilic triazoles attract researchers’ attention for the protection of copper and its alloys. For example, 3-amino-1,2,4-triazole prevents the pitting formation on copper in a borate buffer solution containing chlorides and sulfates more efficiently than benzotriazole does [8].
Often the performance of such inhibitors is enhanced by introducing a hydrophobic substituent into the triazole ring. This reduces their solubility in water and can lead to disturbances in the equipment operation, in particular, due to the formation of particle agglomerates, followed by plugging of conducting channels [9, 10]. Preparation of corrosion inhibitors with high protective performance and satisfactory solubility is an important scientific and practical problem.
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