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Example 3 A sample of zinc anode corrodes uniformly with a current density of 4.27 x 107 A/cm² in an aqueous solution. What is the corrosion rate of zinc in mdd? Ans.: 1.25 mdd

Example 3 A sample of zinc anode corrodes uniformly with a current density of 4.27 x 107 A/cm² in an aqueous solution. What is the corrosion rate of zinc in mdd? Ans.: 1.25 mdd

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Example 3 A sample of zinc anode corrodes uniformly with a current density of 4.27 x 10" A/cm2 in an aqueous solution. What is the corrosion rate of zinc in mdd? Ans.: 1.25 mdd Penetration unit time can be obtained by dividing equation (8) by density of the alloy. The following equation can be used conveniently: Mi Corrosion rate, r = C. пр 9. ..... where p= density (g/cm3) i = current density (A/cm2) M = atomic weight (g• mol-1) n = number of electrons involved C = constant which includes F and any other conversion factor for units = 0.129 in mpy nding on units) = 3.27 in mm/y For instant, the above relationship can be used to establish the equivalent of corrosion current of 1 µA/cm with the rate of corrosion for iron in mpy as shown below [(55.8)(1) (2)(7.86). 1 µA/cm? = 0.129 = 0.46 mpy Imed
Transcribed Image Text:Example 3 A sample of zinc anode corrodes uniformly with a current density of 4.27 x 10" A/cm2 in an aqueous solution. What is the corrosion rate of zinc in mdd? Ans.: 1.25 mdd Penetration unit time can be obtained by dividing equation (8) by density of the alloy. The following equation can be used conveniently: Mi Corrosion rate, r = C. пр 9. ..... where p= density (g/cm3) i = current density (A/cm2) M = atomic weight (g• mol-1) n = number of electrons involved C = constant which includes F and any other conversion factor for units = 0.129 in mpy nding on units) = 3.27 in mm/y For instant, the above relationship can be used to establish the equivalent of corrosion current of 1 µA/cm with the rate of corrosion for iron in mpy as shown below [(55.8)(1) (2)(7.86). 1 µA/cm? = 0.129 = 0.46 mpy Imed
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