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. Determine the corrosion potential and corrosion rate of an iron pipe carrying 1N sulfuric acid at 0.2m/s at 25°C. Assume that the entire iron surface acts as cathode, that Tafel slopes are ±0.100 V, and that the exchange current densities for Fe/Fe and for hydrogen on iron are 103 and 10-A/m,

. Determine the corrosion potential and corrosion rate of an iron pipe carrying 1N sulfuric acid at 0.2m/s at 25°C. Assume that the entire iron surface acts as cathode, that Tafel slopes are ±0.100 V, and that the exchange current densities for Fe/Fe and for hydrogen on iron are 103 and 10-A/m,

Biochemistry
Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
Section: Chapter Questions
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12. Determine the corrosion potential and corrosion rate of an iron pipe carrying 1N sulfuric acid at 0.2m/s at 25°C. Assume that the entire iron surface acts as cathode, that Tafel slopes are +0.100 V, and that the exchange current densities for Fe/Fe and for hydrogen on iron are 10 and 10 A/m, respectively. 13. Determine the corrosion potential and corrosion rate of zinc in 1 N hydro- chloric acid. Assume that the entire zinc surface acts as cathode, that Tafel slopes are +0.100 V, and that the exchange current densities for zinc and for hydrogen on zinc are 0.1 and 10 A/m, respectively. 14. Show the complex-plane impedance spectra for the following electrochemi- cal cells: (a) The cell is represented by a single electrical resistance of value, R (2). (b) The cell is represented by a capacitance of value, C (F). (c) The cell is represented by an equivalent circuit with a resistance, R, (2), in series with a capacitance, C, (F). (d) The cell is represented by an equivalent circuit with a resistance, R, (2), in paral- lel with a capacitance, C, (F). (e) The cell is represented by the circuit shown in Fig. 5.11(a). Answers to Problems 1. -0.40 V. 2. (a) -0.58 V; (b) –0.52 V. 3. 0.90 V. 4. -0.188 V; active direction. 5. 2.3 x 10A; 0.0067gmd. 6. 0.134mm/y. 7. dicordpH = -2.3(0.059iom)/B. 8. B = 0.03 V; i, = 8 x 10 A/cm. 9. -0.719 V. 10. 2.73 gmd. 11. k = 0.0217/i 12. -0.17V (S.H.E.); 0.58mm/y. 13. -0.53 V (S.H.E.); 29.9mm/y.
Transcribed Image Text:12. Determine the corrosion potential and corrosion rate of an iron pipe carrying 1N sulfuric acid at 0.2m/s at 25°C. Assume that the entire iron surface acts as cathode, that Tafel slopes are +0.100 V, and that the exchange current densities for Fe/Fe and for hydrogen on iron are 10 and 10 A/m, respectively. 13. Determine the corrosion potential and corrosion rate of zinc in 1 N hydro- chloric acid. Assume that the entire zinc surface acts as cathode, that Tafel slopes are +0.100 V, and that the exchange current densities for zinc and for hydrogen on zinc are 0.1 and 10 A/m, respectively. 14. Show the complex-plane impedance spectra for the following electrochemi- cal cells: (a) The cell is represented by a single electrical resistance of value, R (2). (b) The cell is represented by a capacitance of value, C (F). (c) The cell is represented by an equivalent circuit with a resistance, R, (2), in series with a capacitance, C, (F). (d) The cell is represented by an equivalent circuit with a resistance, R, (2), in paral- lel with a capacitance, C, (F). (e) The cell is represented by the circuit shown in Fig. 5.11(a). Answers to Problems 1. -0.40 V. 2. (a) -0.58 V; (b) –0.52 V. 3. 0.90 V. 4. -0.188 V; active direction. 5. 2.3 x 10A; 0.0067gmd. 6. 0.134mm/y. 7. dicordpH = -2.3(0.059iom)/B. 8. B = 0.03 V; i, = 8 x 10 A/cm. 9. -0.719 V. 10. 2.73 gmd. 11. k = 0.0217/i 12. -0.17V (S.H.E.); 0.58mm/y. 13. -0.53 V (S.H.E.); 29.9mm/y.
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