Corrosion Inhibition of Steel by Polycarboxylates
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CORROSION INHIBITION OF STEEL BY POLYCARBOXYLATES І. М. Zin’,1 H. H. Veselivs’ka,1,2 М. B. Tymus’,1 Z. М. Il’nyts’kyi,3 F. І. Tsyupko,3 and А. І. Hladii3 It is shown that polycarboxylates obtained by copolymerization of acrylic acid and acrylate monomers inhibit corrosion of low-carbon steel in a neutral aqueous medium. We establish the fact that the efficiency of their protective action increases synergistically after addition of benzotriazole. Polycarboxylates are promising for corrosion protection of steel products in transportation and storage. Keywords: low-carbon steel, polycarboxylate, inhibitor, potentiodynamic polarization, corrosion potential, corrosion current.
Corrosion-resistant preservative materials, including inhibited materials, are often used for the protection of metallic products from atmospheric corrosion in their transportation and storage [1–3]. Known preservative materials are predominantly obtained from waste of oil refining. To clean the surface of metallic products from them, it is necessary to use degreasing compositions based on organic solvents, which pollute the environment. Polycarboxylates obtained on the base of comonomers of acrylic acid with methyl acrylate and hexapropylene glycol monoacrylate, can be promising base components of corrosion-resistant preservative materials for steel products. These compounds are water-soluble, can form a protective film on the surface of metal, and to remove them, it is not necessary to use toxic solvents [4]. It is known [5–7] that carboxylates of monomeric type are efficient corrosion inhibitors of steel, and their protective effect can be enhanced by combination with azoles, in particular, benzotriazole. In comparison with carboxylates, azoles are susceptible to stronger adsorption interaction with the surface of metal oxide [6], thus complementing the protective action of carboxylates and causing an increase in the total anticorrosion effect. The aim of the present work is to investigate the capability of polycarboxylates to inhibit corrosion of steel in a neutral aqueous medium both individually and in a composition with benzotriazole.
Methodical Part Water-soluble polycarboxylates were obtained by the method of copolymerization of acrylic acid with methyl acrylate (sample І), and acrylic acid with methyl acrylate and PPA6 BisomerTM hexapropylene glycol monoacrylate (sample ІІ) by the methods described in [4]. The obtained polymers were neutralized by tetraethylenepentamine. The molecular mass of polycarboxylates І and ІІ, determined by the viscosimetric method, was equal to 4800 and 5100 g/mole, respectively. 1 2 3
Karpenko Physicomechanical Institute, Ukrainian National Academy of Sciences, Lviv, Ukraine. Corresponding author; e-mail: [email protected].
“L’vivs’ka Politekhnika” National University, Lviv, Ukraine.
Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol. 50, No. 6, pp. 117–120, November–December, 2014. Original article submitted May 20, 2014. 1068-820X/15/5006–0903
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Springer Science+Business Media New York
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