Example 3A sample of zinc anode corrodes uniformly with a current density of 4.27 x 10" A/cm2 in anaqueous solution. What is the corrosion rate of zinc in mdd?Ans.: 1.25 mddPenetration unit time can be obtained by dividing equation (8) by density of the alloy. Thefollowing equation can be used conveniently:MiCorrosion rate, r = C.пр9......wherep= density (g/cm3)i = current density (A/cm2)M = atomic weight (g• mol-1)n = number of electrons involvedC = constant which includes F and any other conversion factor for units= 0.129 in mpynding on units)= 3.27 in mm/yFor instant, the above relationship can be used to establish the equivalent of corrosion current of1 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 mpyImed

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Answered: Example 3 A sample of zinc anode…

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

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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Corrosion is defined as an activity that transforms refined metals into more chemically stable forms such as oxide, hydroxide, carbonate, or sulfide. It refers to the slow decomposition of things (typically metals); thanks to chemical and/or electrochemical reactions with their surroundings. Corrosion engineering is the science of preventing and controlling corrosion.

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