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Q1.A Zn electrode is corroding in a de-aerated electrolyte which has a pH of 4.0 and the activity of Zn ions of 0.004 at 25°C. (a) Determine the icorr of nickel. (b) Determine also ECorr The following data are provided: i,(H on Zn) = 10-6A/cm2 (cathode over potential) i,(O on Zn) = 10-14A/cm2 (anode over potential) b, = 0.012V/decade b. = -0.012V/decade Anodic: ZnàZn+2 +2e" Cathodic: H2à2H† +2e¯ korr (1) na=Ecorr-Ezev(Ni) = b, log io korr (2) nc=Ecorr-E#3 =b¿ log 10

Q1.A Zn electrode is corroding in a de-aerated electrolyte which has a pH of 4.0 and the activity of Zn ions of 0.004 at 25°C. (a) Determine the icorr of nickel. (b) Determine also ECorr The following data are provided: i,(H on Zn) = 10-6A/cm2 (cathode over potential) i,(O on Zn) = 10-14A/cm2 (anode over potential) b, = 0.012V/decade b. = -0.012V/decade Anodic: ZnàZn+2 +2e" Cathodic: H2à2H† +2e¯ korr (1) na=Ecorr-Ezev(Ni) = b, log io korr (2) nc=Ecorr-E#3 =b¿ log 10

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Q1.A Zn electrode is corroding in a de-aerated electrolyte which has a pH of 4.0 and the activity of Zn ions of 0.004 at 25°C. (a) Determine the icorr of nickel. (b) Determine also ECorr The following data are provided: i,(H on Zn) = 10-©A/cm² (cathode over potential) i,(O on Zn) = 10-1ªA/cm? (anode over potential) b, = 0.012V/decade b. = -0.012V/decade Anodic: ZnàZn+2 +2e¯ Cathodic: H2à2H* +2e¯ icorr (1) na=Ecorr-Erev(Ni) = ba log io korr (2) nc=Ecorr-EH2 = be log io
Transcribed Image Text:Q1.A Zn electrode is corroding in a de-aerated electrolyte which has a pH of 4.0 and the activity of Zn ions of 0.004 at 25°C. (a) Determine the icorr of nickel. (b) Determine also ECorr The following data are provided: i,(H on Zn) = 10-©A/cm² (cathode over potential) i,(O on Zn) = 10-1ªA/cm? (anode over potential) b, = 0.012V/decade b. = -0.012V/decade Anodic: ZnàZn+2 +2e¯ Cathodic: H2à2H* +2e¯ icorr (1) na=Ecorr-Erev(Ni) = ba log io korr (2) nc=Ecorr-EH2 = be log io
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