Specifics of brass corrosion in solutions of some organic acids

• Ya.G. Avdeev¹, K.L. Anfilov², V.S. Ivanova², T.E. Andreeva¹ and S.Yu. Rybakov¹

¹ A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninsky pr. 31, 119071 Moscow, Russian Federation
² Federal State Budgetary Educational Institution of Higher Education “Bauman Moscow State Technical University” (Kaluga Branch), Bazhenov str. 2, 248000 Kaluga, Russian Federation

Abstract: The kinetics of corrosion of brass LK62-0.5 in freely aerated solutions of acetic (0.25–8.0 M) and citric (0.001–2.0 M) acids was studied. The effect of the convective factor of the environment and addition of a corrosion inhibitor, catamine AB, on these processes was also investigated. The presence of a corrosion product, Cu(II) cations, has an accelerating effect on the corrosion of brass in the environments studied, including solutions containing catamine AB. The dependence of the corrosion rate of brass on the convective factor in freely aerated acid solutions and in acid solutions containing Cu(II) cations is formally described by the equation k=a+b·n^1/2, where a and b are empirical parameters and n is the rotation frequency of the propeller magnetic stirrer that stirs the solution. In solutions of acetic and citric acids, including stirred media containing Cu(II) cations, the corrosion rate of brass does not exceed 0.91 and 0.55 g/(m²·h), respectively. In the same environments with addition of catamine AB, the corrosion rate of brass does not exceed 0.14 g/(m²·h). Given the low corrosion rate of brass in the inhibited acidic environments, the results obtained are of practical interest, especially for solutions of acetic acid.

Keywords: corrosion, corrosion inhibitors, brass, acetic acid, citric acid

Int. J. Corros. Scale Inhib., 2024, 13, no. 3, 1501-1519
doi: 10.17675/2305-6894-2024-13-3-8

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