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Electrochemical characteristics of a cobalt alloy with a protective passive layer

Reimann Ł.

Archives of Metallurgy and Materials

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2016

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Vol. 61, iss. 3

1283--1290

EN

The aim of this study was to assess the quality of the passive layer formed on the surface of a CoCr alloy used on dentures to see the effect on resistance to pitting corrosion and electrochemical parameters. Studies were performed using on potentiodynamic tests and electrochemical impedance spectroscopy. The passive layer was formed spontaneously and by electrochemical method on samples after casting and after simulation porcelain firing on metal. Samples of the passivation electrochemical characterized by the improvement in corrosion resistance. Prolonging the passivation time from one to 24 hours and increasing the potential value from 0 to 200 mV improved the quality of the passive layer and all characteristics of electrochemical parameters.

2

Właściwości trójkomorowego mikrobiologicznego ogniwa paliwowego

Gabryszewska M., Szewczyk K. W.

Przemysł Chemiczny

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2011

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T. 90, nr 2

192-197

3

Charakterystyki elektrochemiczne stopów LaNi5-xInx (x = 0,1; 0,2 lub 0,5) pod kątem ich zdolności do pochłaniania wodoru

Giza K., Drulis H., Bala H.

Ochrona przed Korozją

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2011

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nr 4-5

210-212

PL

W pracy dokonano wstępnej elektrochemicznej charakterystyki stopów typu LaNi5-xInx w środowisku 6M KOH z zastosowaniem galwanostatycznych i potencjokinetycznych pomiarów polaryzacyjnych. Obecność indu w badanych stopach prowadzi do obniżenia gęstości prądów anodowych w zakresie pasywnym. Galwanostatyczne pomiary ładowania/rozładowania wskazują, że wszystkie badane stopy typu LaNi5-xInx absorbują wodór, aczkolwiek ich efektywność pochłaniania jest mniejsza niż dla wyjściowego LaNi5. Prócz tego, częściowe podstawienie niklu indem w związku LaNi5 powoduje obniżenie gęstości prądu wymiany układu H2O/H2.

EN

In this work, the preliminary electrochemical characterization of the LaNi5-xInx type alloys is presented on the basis of galvanostatic and potentiokinetic polarization measurements in 6M KOH. It is shown that the presence of indium in the tested alloys causes decrease of anodic currents within the passive range. The galvanostatic charge/discharge experiments have shown that the tested LaNi5-xInx alloys absorb hydrogen, although their absorption efficiency is lower than that for the based LaNi5 alloy. It is also shown that partial substitution of Ni by In in the LaNi5 compound causes decrease of the exchange current density for H2O/H2system.

4

Dependence of growth conditions on copper germanate nanowires and their electrochemical characteristics

Pei L. Z., Pei Y. Q., Yang Y., Dong Y. P., Wang S. B., Fan C. G., Duan T., Zhang Q.

Materials Science Poland

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2011

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Vol. 29, No. 4

241--247

EN

Copper germanate (CuGeO3) nanowires have been synthesized by the hydrothermal deposition process using GeO2 and copper foil as the resource as well as the deposition substrate. The factors including hydrothermal temperature, pressure and duration of the process were investigated in order to analyze the processing parameters that control the formation process, morphology and size of the nanowires. The dependence of the nanowires properties on the growth conditions shows that the CuGeO3 nanowires can be synthesized in a large range of different hydrothermal parameters from 400 C to 250 hydrothermal pressure has an important effect on the formation and growth of the CuGeO3 nanowires. The CuGeO3 nanowires exhibit good electrochemical cyclic voltammetry characteristics owing to offering many advantages in sensing applications including their small size, high aspect ratio and conductance.