prbset10_key4324 - EMA 4324 Problem Set 10 5-1. Plot the...

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EMA 4324 Problem Set 10 5-1. Plot the following cathodic polarization data for carbon steel in 0.5N H 2 SO 4 on linear coordinates and determine the polarization resistance. From the shape of the plot, would you estimate that the absolute value of b A is greater or less than b C ? ***************************************************** The fact that cathodic overvoltage increases with increased current density suggests that b C > b A [see Figure 5.2[d] from text]. 9.0 6.3 4.1 2.5 1.0 cathodic overvoltage, mV 300 240 160 100 40 current density, m A/cm 2 0 1 2 3 4 5 6 7 8 9 10 cathodic overvoltage, mV 0 50 100 150 200 250 300 350 current density, uA/cm^2 R p = 6.4x10^(-3)/250x10^(-6) = 25.6 ohm
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5-2. With the following anodic and cathodic polarization data - the same conditions as Problem 5-1, but larger currents - plot the polarization curves on semilogarithmic coordinates and determine b A , b C , E corr and I corr . ********************
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This note was uploaded on 10/18/2011 for the course EMA 4324 taught by Professor Staff during the Fall '09 term at University of Florida.

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prbset10_key4324 - EMA 4324 Problem Set 10 5-1. Plot the...

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