Reaction rate expressing

The algebraic form of the expression (9.24) for the enhancement factor is specific to the particular reaction rate expression we have considered, and corresponding results can easily be obtained for other reactions in binary mixtures, for example the irreversible cracking A—2B. ... 

The two dashed lines in the upper left hand corner of the Evans diagram represent the electrochemical potential vs electrochemical reaction rate (expressed as current density) for the oxidation and the reduction form of the hydrogen reaction. At point A the two are equal, ie, at equiUbrium, and the potential is therefore the equiUbrium potential, for the specific conditions involved. Note that the reaction kinetics are linear on these axes. The change in potential for each decade of log current density is referred to as the Tafel slope (12). Electrochemical reactions often exhibit this behavior and a common Tafel slope for the analysis of corrosion problems is 100 millivolts per decade of log current (1). A more detailed treatment of Tafel slopes can be found elsewhere (4,13,14). 

Reaction Rate Expression 119 Rearranging and integrating Equation 3-28 between the limits gives... 

Reaction Rate Expression 139 Reananging Equation 3-121 and integrating between tlie limits gives... 

Reaction Rate Expression 179 DetcriSunatioin of th pScudo-fiftt... 

Reaction Rate Expression 185 Equating the coefficients of the constant and gives Const 1 = A6b + B (3-268)... 

Reaction Rate Expression Linearizing the rate expression gives... 

Reaction Rate Expression 191 Determine the order of the reaetion and the rate eonstant. Solution... 

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