Antagonism of organic and inorganic activators in copper local depassivation in alkaline solutions

• E.A. Skrypnikova¹, S.A. Kaluzhina², E.V. Orlova³ and L.N. Volkova²

¹ MESC Air Force Military Air Academy named after N. E. Zhukovsky and Yu. A. Gagarin, ul. Staryh bolshevikov 54a, Voronezh, 394000 Russian Federation
² Voronezh State University, Universitetskaya pl. 1, Voronezh, 394006 Russian Federation
³ N. N. Burdenko Voronezh State Medical Academy, Studencheskaya ul. 10, Voronezh, 394036 Russian Federation

Abstract: The local depassivation of copper in alkaline medium (pH = 12) in the presence of organic activators (glycine, α-alanine, β-alanine) simultaneously with inorganic ones (NaCl) was studied. The studies were carried out in background electrolytes: 1·10^–2 M NaOH + 5·10^–3 M Gly, 1·10^–2 M NaOH + 5·10^–3 M α-Ala, and 1·10^–2 M NaOH + 1·10^–2 M β-Ala. The concentration of the additive (NaCl) in the working electrolyte was varied in a wide range from 1·10^–6 to 1·10^–1 M. It was found that NaCl can affect the intensity of copper local depassivation in two ways. At inorganic additive concentrations in the range of 1·10^–6–1·10^–4 M, significant suppression of the depassivation process occurs, which changes to acceleration in the NaCl concentration range of 1·10–4^–1·10^–1 M. An explanation of the observed effects was suggested from the viewpoint of competitive adsorption, nucleophilic substitution and complexing theories for particles present in the systems being studied.

Keywords: copper, local activation, glycine, α-alanine, β-alanine, Cl^– ions

Int. J. Corros. Scale Inhib., 2013, 2, no. 1, 1-8 PDF (1 121 K)
doi: 10.17675/2305-6894-2013-2-1-001-008

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