Electrodes with amorphous coatings, nickel and cobalt, for electrolytic hydrogen evolution

• Autorzy: Nawrat G. , Gnot W. , Małachowski A. , Górska M.
• Języki publikacji: EN

Abstrakty

EN

The results of investigations on obtaining nickel, cobalt and phosphorus-cobalt alloy coatings by electroplating and nickel-phosphorus and cobalt-phosphorus coatings on nickel and steel substrates using a chemical method are presented. Physico-chemical properties of the obtained electrodes are described and include: thickness, chemical and phase compositions of the coatings as well as their surface morphology, and also the active surface development as determined by a measurement of double-layer capacitance and a and b coefficients of the Tafel equation for the hydrogen evolution process in alkaline and neutral media as determined by the potentiostatic method. The desired effect of lowered hydrogen overpotential was observed with chemically obtained two-component cobalt-phosp-horus coatings. Amongst the coatings investigated, the latter shows the lowest hydrogen overpotential in an alkaline solution of ca. 0.12 Vat lOO A/m2 current density and also a high degree of active surface development, ca. 100 times higher than that of a mercury electrode. Resistance to corrosion of the obtained coatings was also determined by gravimetric and potentiostatic methods. A linear corrosion rate of cobalt-phosphorus coatings in catholyte obtained in chlor-alkali diaphragm process was deter-mined as being ca. 0.10 mm/year. Nickel-phosphorus coatings show lower corrosion rate, but at higher hydrogen overpotential.

Słowa kluczowe

EN

electrode; coating; nickel; cobalt; electrolysis; hydrogen

PL

elektroda; powłoka; nikiel; kobalt; elektroliza; wodór

• Wydawca: Centrum Materiałów Polimerowych i Węglowych PAN
• Czasopismo: Polish Journal of Applied Chemistry
• Rocznik: 1999
• Tom: Vol. 43, nr 3-4
• Strony: 189--198
• Opis fizyczny: Bibliogr. 11 poz.

Twórcy

autor

Nawrat G.

• Silesian Technical University, Institute of Chemistry, Inorganic Technology and Electrochemistry, ul. Bolesława Krzywoustego 6, 44-100 Gliwice, Poland

autor

Gnot W.

• Silesian Technical University, Institute of Chemistry, Inorganic Technology and Electrochemistry, ul. Bolesława Krzywoustego 6, 44-100 Gliwice, Poland

autor

Małachowski A.

• Silesian Technical University, Institute of Chemistry, Inorganic Technology and Electrochemistry, ul. Bolesława Krzywoustego 6, 44-100 Gliwice, Poland

autor

Górska M.

• Institute of Inorganic Chemistry, ul. J. Sowińskiego 11, 44-100 Gliwice, Poland

Bibliografia

• [1] A. KORZYŃSKI, T, BUCZEK-KARCZEWSKA, A. DUKOWICZ, G. NAWRAT, A. MAŁACHOWSKI, Materiały I Kongresu Technologii Chemicznej (Proceedings of the Ist Congress of Chemical Technology), Wydawnictwo Uczelniane Politechniki Szczecińskiej, Szczecin, 1995, p. 684.
• [2] G. NAWRAT, T. BUCZEK-KARCZEWSKA, M. GONET, A. KORCZYŃSKI, Modern Chlor-Alkali Technology, Ed. R.W. Curry, SCI, London, 1995, vol. 6, ch. 15, p. 149.
• [3] D. SCHLAFER, C. TRAINI, G. MENEGHINI, Modern Chlor-Alkali Technology, Ed. R.W. Curry SCI, London, 1995, vol. 6, ch. 16, p. 161.
• [4] V.H. THOMAS, E.J. RUDD, Modern Chlor-Alkali Technology, Ed. C. Jakson, Ellis Horwood Limited, Chichester, 1983, vol. 2, ch. 10, p. 159.
• [5] G. NAWRAT, A. MAŁACHOWSKI, M. GONET, A. KORCZYŃSKI, Problemy Eksploatacji, 23, z. 4, p. 213 (1996).
• [6] M.D. ARCHER, C.C. CÓRKĘ, B.H. HARIJ, Elektrochim. Acta, 32, p. 13 (1987).
• [7] H. ISFORT, Modern Chlor-Alkali Technology, Ed. C. Jackson, Ellis Horwood Limited, Chichester, 1983, vol. 2, ch. 9, p. 132.
• [8] G. NAWRAT, M. GONET, T. BUCZEK-KARCZEWSKA, A. MAŁACHOWSKI, A. KORCZYŃSKI, Modern Chlor-Alkali Technology, Ed. S. Sealy, SCI, London, 1998, vol. 7, ch. 10, p. 75.
• [9] S. ŁABUŚ, A. MAŁECKI, Ochrona przed Korozją, 33, z. 6, 130 (1990).
• [10] L.L. GRUSS, F. PEARLSTEIN, Platinand Surface Finishing, 70, 2, 47 (1983)
• [11] A. KORCZYŃSKI, Materiały I Kongresu Technologu Chemicznej (Proceedings of the 1st Congress of Chemical Technology), Wydawnictwo Uczelniane Politechniki Szczecińskiej, Szczecin, 1995, p. 649.