ISSN 2305-6894

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

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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., , 1, 1-8 PDF (1 121 K)
doi: 10.17675/2305-6894-2013-2-1-001-008

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