Stability of Carbon Materials to Anodic Oxidation. Analysis of Possible Factors

Issue 2(76) 2015
Pages 26-37

T.V. Lipkina1, V.D. Eroshenko1,2, A.V. Emelin1, D.V. Pushuk1, I.A. Goncharov1, S.M. Lip-kin1, Yu.A. Andreev3,4, N.V. Smirnova1

1Platov South-Russian State Polytechnic University (Novocherkassk Polytechnic Institute)
2Doncarb Graphite, Novocherkassk
3Hydrochemical Institute, Rostov-on-Don
4Southern Federal University, Rostov-on-Don

Keywords: carbon material, thermal expanded graphite, anodic oxidation, corrosion protection

The factors that determine resistance of the Zn, Cu, thermal expanded graphite doped carbon materials to anodic oxidation were tested and a process rate and composition of oxidation products of materials were defined. It was shown that an anodic oxidation of carbon
materials is a complicated process. The resulting rate is detected as a set of an electrochemical oxidation process with a formation of water-soluble oxygen containing compounds, mainly aromatic and aliphatic acids and ethers, intercalation of solution components into a surface layer of material, and a mechanical destruction and powdering of particles from material. Thus, an influence of each component is determined by oxidation conditions and carbon material composition. The doping of materials with metal powders contributes to quick degradation, while doped material, in which the thermal expanded graphite concentration is 0,5%, exhibit enhanced resistance to anodic oxidation by 30%. Therefore, thermal expanded graphite doped carbon materials is considered to be a prospective anode earth electrode material.