ISSN 2305-6894

A study of sorption phenomena on steel surface in solutions of aminotris (methylenephosphonic acid)

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1 Federal State Budgetary Educational Institution of Higher Education “D.I. Mendeleev Russian Chemical-Technological University”, Miusskaya square, 9, 125047 Moscow, Russian Federation
2 A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninsky prosp, 31, 119071 Moscow, Russian Federation

Abstract: The behavior of carbon steel in solutions containing components of alkaline cyanide-free electrolyte for bronzing has been studied. It has been shown by the open circuit potential measurement method that contact deposition of copper on steel surface is thermodynamically possible in the solutions studied. Impedance spectrometry data show that the interaction of steel with the components of the copper-containing alkaline solution leads to the formation of a passivating film on its surface, which inhibits contact copper deposition. It has been shown that the formation of a passivation film is also possible if no copper is present in the solution. The process is significantly accelerated in solutions containing divalent copper ions due to the interaction of iron corrosion products with the divalent copper – aminotris(methylene¬phosphonic acid) complex by the electrophilic substitution mechanism. This interaction results in the deposition of insoluble copper hydroxides on the steel surface. Data of X-ray photoemission analysis confirm that the film contains compounds of mono- and divalent copper, as well as ligand molecules.

Keywords: contact deposition of copper, alkaline cyanide-free bronzing, impedance spectrometry

Int. J. Corros. Scale Inhib., , 10, no. 3, 932-942
doi: 10.17675/2305-6894-2021-10-3-7

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