(b) To protect an iron (Fe) rod of radius of 20 cm from being oxidized, a...
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(b) To protect an iron (Fe) rod of radius of 20 cm from being oxidized, a layer of chromium (Cr) is coated. Suppose the oxidation rate constant for Cr and Fe is respectively 2.510-8 cm/sec and 2x10-6 cm/sec. It is assumed that the oxidation rate constant (K) of iron under chromium oxide coating remains the same as it is in direct contact with air. Determine what is the minimum thickness of Cr coating is needed to protect Fe for 5 years (365 days per year) from oxidation up to a maximum thickness of 2 cm (i.e., the maximum thickness of Fe2O3 allowed is 2 cm)? Assume negligible atomic density change during the oxidation process. (8 points) (b) To protect an iron (Fe) rod of radius of 20 cm from being oxidized, a layer of chromium (Cr) is coated. Suppose the oxidation rate constant for Cr and Fe is respectively 2.510-8 cm/sec and 2x10-6 cm/sec. It is assumed that the oxidation rate constant (K) of iron under chromium oxide coating remains the same as it is in direct contact with air. Determine what is the minimum thickness of Cr coating is needed to protect Fe for 5 years (365 days per year) from oxidation up to a maximum thickness of 2 cm (i.e., the maximum thickness of Fe2O3 allowed is 2 cm)? Assume negligible atomic density change during the oxidation process. (8 points)
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To determine the minimum thickness of the chromium Cr coating needed to protect the iron Fe rod for 5 years while limiting the maximum thickness of Fe2O3 to 2 cm we can use Ficks second law of diffusi... View the full answer
Related Book For
Fundamentals Of Momentum Heat And Mass Transfer
ISBN: 9781118947463
6th Edition
Authors: James Welty, Gregory L. Rorrer, David G. Foster
Posted Date:
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