(a) You are required to produce a BCC iron structure that will allow no more than 50 g of hydrogen to be lost per year through each square centimeter of the iron at 400°C. If the concentration of hydrogen at one surface is 0.05 H atom per unit cell and 0.001 H atom per unit cell at the second surface, evaluate the minimum thickness of the iron. (b) Zinc is to be diffused into the copper by dipping copper into molten zinc at 450 °C. Evaluate how long it would take to obtain 10 wt% zinc at a depth of 0.5 mm beneath the сорper surface. Justify is this commercially feasible? What are the potential technical problems that might encounter if the temperature is raised to 1000 °C? Use Table 1 for error function values as needed. At 450°C, the diffusion coefficient D= 6.3 × 1017 m²/s.

(a) You are required to produce a BCC iron structure that will allow no more than 50 g of hydrogen to be lost per year through each square centimeter of the iron at 400°C. If the concentration of hydrogen at one surface is 0.05 H atom per unit cell and 0.001 H atom per unit cell at the second surface, evaluate the minimum thickness of the iron. (b) Zinc is to be diffused into the copper by dipping copper into molten zinc at 450 °C. Evaluate how long it would take to obtain 10 wt% zinc at a depth of 0.5 mm beneath the сорper surface. Justify is this commercially feasible? What are the potential technical problems that might encounter if the temperature is raised to 1000 °C? Use Table 1 for error function values as needed. At 450°C, the diffusion coefficient D= 6.3 × 1017 m²/s.

Principles of Modern Chemistry

8th Edition

ISBN:9781305079113

Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Chapter22: Inorganic Materials

Section: Chapter Questions

Problem 52AP

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