scholarly journals TEMPERATURE COEFFICIENT OF ELECTROMOTIVE FORCE OF GALVANIC CELLS AND THE ENTROPY OF REACTIONS

1922 ◽  
Vol 44 (8) ◽  
pp. 1684-1704 ◽  
Author(s):  
Roscoe H. Gerke
Keyword(s):  
Temperature Coefficient ◽  
Electromotive Force ◽  
Galvanic Cells

EVANOHM ALLOY S

Alloy Digest ◽  
1989 ◽  
Vol 38 (7) ◽  
Keyword(s):  
Electrical Resistivity ◽  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Temperature Coefficient ◽  
Electromotive Force ◽  
Temperature Coefficient Of Resistance ◽  
Resistance Wire ◽  
High Electrical Resistivity ◽  
Optimum Stability

Abstract EVANOHM alloy S offers optimum stability and flexibility with regard to both size and required temperature coefficient of resistance. Its extremely low electromotive force vs copper together with its high electrical resistivity are highly desirable properties in a precision resistance wire. This datasheet provides information on composition, physical properties, and tensile properties. It also includes information on corrosion resistance as well as joining. Filing Code: Ni-373. Producer or source: Wilbur B. Driver Company.

scholarly journals Effect of Hydrogen and Absence of Passive Layer on Corrosive Properties of Aluminum Alloys

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1580 ◽  
Author(s):  
Paweł P. Włodarczyk ◽  
Barbara Włodarczyk
Keyword(s):  
Aluminum Alloys ◽  
Electrode Potential ◽  
Electromotive Force ◽  
Hydrogen Permeation ◽  
Passive Layer ◽  
Hydrogen Corrosion ◽  
Negative Side ◽  
Galvanic Cells ◽  
A Cell ◽  
Absorption Of Hydrogen

This paper reports the results of research on the effect of hydrogen permeation and the absence of passive layers on the variations in the corrosive properties of aluminum alloys. The study demonstrated that such variations contribute to the deterioration of corrosive properties, which in turn contributes to shortening the reliability time associated with the operation of aluminum alloy structures. The analysis involved structural aluminum alloys: EN AW-1050A, EN AW-5754, and EN AW-6060. It was demonstrated that the absorption of hydrogen by the analyzed alloys led to the shift of the electrode potential to the negative side. The built hydrogen corrosion cells demonstrate in each case the formation of electromotive force (EMF) cells. The initial EMF value of the cell and its duration depends on the duration of hydrogenation. As a result of removing the passive layers, the electrode potential also changes to the negative side. Following the removal of the passive layer from one of the electrodes, the cells also generated a galvanic (metal) cell. The duration of such a cell is equivalent to the time of restoration of the passive layer. The formation of such hydrogen and metal galvanic cells changes the electrochemical properties of aluminum alloys, therefore deteriorates the corrosive properties of aluminum alloys.

scholarly journals Thermodynamics of electrochemical reactions in Lead-acid Battery

2018 ◽  
Vol 5 (1) ◽  
Author(s):  
Adebayo Akinbulu ◽  
Toafeek Ogunbayo
Keyword(s):  
Free Energy ◽  
Temperature Coefficient ◽  
Electromotive Force ◽  
Electrochemical Reaction ◽  
Entropy Change ◽  
Enthalpy Change ◽  
Electrochemical Reactions ◽  
Positive Entropy ◽  
Lead Acid Battery ◽  
Lead Acid

Thermodynamics of the electrochemical reaction in lead-acid battery was investigated. A negative value of change in Gibbs’ free energy, ?G, and a positive entropy change, ?S, were obtained for the reaction. ?G was more negative at increased temperature. The reaction was exothermic, with a negative value of enthalpy change, ?H. A relatively small value of temperature coefficient of the electromotive force of the cell, (?E/?T)_P, was also obtained for the reaction.

scholarly journals Thermodynamic properties of the liquid Bi-Cu-Sn lead-free solder alloys

2009 ◽  
Vol 45 (1) ◽  
pp. 95-100 ◽  
Author(s):  
M. Kopyto ◽  
G. Garzel ◽  
L.A. Zabdyr
Keyword(s):  
Thermodynamic Properties ◽  
Cross Sections ◽  
Electromotive Force ◽  
Force Measurement ◽  
Yttria Stabilized Zirconia ◽  
Lead Free Solder ◽  
Stabilized Zirconia ◽  
Galvanic Cells ◽  
Free Solder ◽  
Tin Content

The electromotive force measurement method was employed to determine the thermodynamic properties of liquid Bi-Cu-Sn alloys using solid electrolyte galvanic cells as shown below: Kanthal+Re, Bi-Cu-Sn, SnO2 | Yttria Stabilized Zirconia | air, Pt, Po2=0.2:1 atm Measurements were carried out for three cross-sections with constant Bi/Cu ratio equal to: 1/3, 1 and 3 and for various tin content varying every 10%, resulting in a total of 26 different alloy compositions. The temperature of the measurements varied within the range from 973 to 1325 K. A linear dependence of the e.m.f. on temperature was observed for all alloy compositions and the appropriate line equations were derived. Tin activities were calculated as function of composition and temperature. Results were presented in tables and figures.

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