Corrosion of copper in citric acid solutions
https://doi.org/10.1234/2949-3412-2023-1-4-151-165
Abstract
The corrosion of copper in freely aerated solutions of citric acid (C6H8O7) at 20 ± 2 °C was studied. The corrosion rate of copper in such solutions does not significantly depend on the duration of contact of copper with an aggressive environment (1–20 days) and the concentration of C6H8O7 (0,001–2 M) in it. The aggressiveness of C6H8O7 solutions towards copper increases when moving from static media to media stirred with a magnetic stirrer. Also, the aggressiveness of C6H8O7 solutions towards metallic copper is increased by the presence of a corrosion product in them – Cu(II) cations. This effect is especially noticeable when it comes into contact with a corrosive environment stirred with a magnetic stirrer. To protect copper in freely aerated C6H8O7 solutions, a triazole derivative, IFKhAN-92, is recommended. The effectiveness of this inhibitor does not significantly depend on the duration of contact of the metal with the aggressive environment, the content of C6H8O7 in it, and the hydrodynamic characteristics of the solution. An important property of the IFKhAN-92 inhibitor is that it retains its protective effect against metallic copper even in the case of accumulation of Cu(II) cations in a corrosive environment, which manifests itself not only in static but also in dynamic environments. The dependence of the copper corrosion rate on the intensity of mixing of the corrosive medium in freely aerated solutions of 2 M C6H8O7 and 2 M C6H8O7+0,05 M Cu(II), both in the absence and presence of a corrosion inhibitor, is formally described by an equation of the form k= a+b*n1/2, where a and b are empirical parameters, n is the rotation frequency of the magnetic stirrer. Additives IFKHAN-92 reduce parameters a and b of this equation.
About the Authors
Ya. G. AvdeevRussian Federation
119071
Leninskii pr. 31
Moscow
K. L. Anfilov
Russian Federation
248000
Bazhenov str. 2
Kaluga
Yu. I. Kuznetsov
Russian Federation
119071
Leninskii pr. 31
Moscow
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Review
For citations:
Avdeev Ya.G., Anfilov K.L., Kuznetsov Yu.I. Corrosion of copper in citric acid solutions. Title in english. 2023;(4):151-165. (In Russ.) https://doi.org/10.1234/2949-3412-2023-1-4-151-165