Inhibition corrosion of zinc in concentrated alkaline electrolyte by combination of organic and inorganic compounds
Keywords:Alkaline corrosion of zinc, Combination of organic compounds and salts of calcium and magnesium, Energy-blocking mechanism for inhibiting corrosion, Electrochemical infiltration and formation of metal hydroxides
Background. Zinc is widely used in chemical current sources (CCS) with alkaline electrolytes. One of the promising ways of self-discharge reduction and the service life improvement of the CCS is the use of zinc corrosion inhibitors. However, nowadays there is only a small number of known compounds that inhibit the corrosion of zinc alkaline, and the mechanism of the protective action of poorly understood.
Objective. The objective is to study the influence of nitrohen-, oksyhen- and sulfur-containing organic compounds and their combinations with inorganic matter on corrosion of zinc in concentrated alkaline electrolyte, identifying the mechanism of their protective effect.
Methods. The research was carried out by mass-metrical, volum-metrical and electrochemical methods with sheet (brand U0) and powder zinc10 M in KOH and in the same solution with inhibiting additives. Adsorption studies were performed by method of electro-capillary curve removal on a mercury electrode. Mixture state of organic and inorganic compounds was studied by NMR spectroscopy. Zinc surface state was studied by Auger spectroscopy coupled with ion etching after corrosion tests.
Results. Combinations of polyoxyethylenealkyl ethers (FC VIS-15, DS-10, OP-4) and benzotriazole with salts of calcium and magnesium show high protective properties during zinc corrosion in10 M KOH. Protection degree of zinc electrode if any exists reaches 75 %. Inhibitors inhibit the process of hydrogen evolution in alkaline electrolytes but they do not affect significantly on anodic dissolution of zinc.Conclusions. There is the improvement of protective effect of organic inhibitors if there is calcium and magnesium in alkaline solutions. The obtained results indicate the prospects of using studied corrosion inhibitors in chemical power sources with zinc anode and alkaline electrolyte.
V.S. Bagockij and A.M. Skundin, Chemical Source of Electrical Energy.Moscow,Russia: Energoizdat, 1981, 350 p. (in Russian).
V.N. Varyipaev et al., Chemical Current Sources.Moscow,Russia: Vyisshaya Shkola, 1990, 240 p. (in Russian).
N.V. Korovin, Electrochemical Energetics.Moscow,Russia: Energoatomizdat, 1991, 212 p. (in Russian).
Yu.E. Mamontova and Yu.A. Stekolnikov, “Corrosion and alkaline chemical sources of current”, Vestnik TGTU, vol. 16, no. 2, рр. 348–360, 2010 (in Russian).
S. Pogrebova, Metal Corrosion Inhibitors.Kyiv,Ukraine: Hay-Tek Pres, 2012, 296 p. (in Ukrainian).
L.I. Antropov, Theoretical Electrochemistry.Kyiv,Ukraine: Libіd’, 1993, 554 p. (in Ukrainian).
M.N. Hull et al., “The anodic behavior of zinc electrodes in potassium hydroxide electrolytes”, Electrochem. Soc., vol. 117, no. 2, рр. 192–198, 1970.
L.A. Reznikova et al., “Investigation of the mechanism of hydrogen evolution and introduction of potassium in the zinc electrode in alkaline solutions under cathodic polarization”, Elektrokhimiya, vol. 17, pp. 542–547, 1981 (in Russian).
E.A. Nechaev and V.I. Kuprin, “The phenomenon of selective adsorption of organic compounds on metals and oxides”, in Itogi Nauki i Tehniki. Korrozija i Zashhita ot Korrozii,Moscow,Russia: VINITI, vol. 29, pp. 93–152, 1989 (in Russian).
L.I. Antropov, “The formal theory of action of organic corrosion inhibitors”, Zashhita Metallov, vol. 13, no. 4, pp. 387–399, 1977 (in Russian).
L.I. Antropov and I.S. Pogrebova, “Connection between the adsorption of organic compounds and their influence on the corrosion of metals in acid medium”, in Itogi Nauki i Tehniki. Korrozija i Zashhita ot Korrozii,Moscow,Russia: VINITI, vol. 2, pp. 27–112, 1973 (in Russian).
B.N. Kabanov et al., “Electrochemical introduction and its connection with some issues of metal corrosion”, Zashhita Metallov, vol. 11, no. 2, pp. 131–138, 1975 (in Russian).
L.A. Reznikova et al., “Investigation of cathode processes on zinc in alkaline solutions by the impedance method”, Elektrokhimiya, vol. 9, no. 3, pp. 877–880, 1973 (in Russian).
I.S. Pogrebova and G.I. Prihodko, “The role of metallids in the process of hydrogen evolution on zinc from concentrated alkaline electrolytes”, in Proc. V Ukr. Republ. Conf. Electrocem.,Uzhgorod,Ukraine, 1990, p. 73. (in Russian).
I.S. Pogrebova et al., “Catalytic hydrogen evolution on zinc in the presence of benzotriazole and its inhibition by calcium cations”, Elektrokhimiya, vol. 26, pp. 793–794, 1990 (in Russian).
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