Foundations of Materials Science and Engineering
6th Edition
ISBN: 9781259696558
Author: SMITH
Publisher: MCG
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Chapter 13.10, Problem 65AAP
To determine
The time required for the sample to have a weight gain of
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Nickel experiences corrosion in an acid solution according to the reaction
Ni + 2H†
→ Ni²+ + H,
(a) The rates of both oxidation and reduction half-reactions are controlled by activation
polarization. Compute the rate of oxidation of Ni (in mol/cm2-s) given the following activation
polarization data:
For Nickel
For Hydrogen
V(H/H,) = 0 V
i, = 6 × 10-7 A/cm²
B = -0.10
V(NINP") = -0.25 V
io
= 10¬8 A/cm²
B = +0.12
(b) Compute the value of the corrosion potential.
Consider de-oxidation by the addition of
ferromanganese (60 percent Mn) to molten
steel at 1600°C.The initial oxygen content is
0.04 wt%. It has to be brought down to 0.02
wt%. Calculate the quantity of
ferromanganese required per tonne of steel.
The manganese content of steel before de-
oxidation is 0.1 wt%.
(MnO) + [Fe] = [Mn] + (FeO)
Given: K Mn at 1873 K = 0.4
K Fe-Mn at 1873 K = 0.156
Assumptions: Fe and Mn form ideal solutions
•You are case-hardening a tool made of BCC (α) iron in the presence of a carbonaceous material. A heat treatment at 600 oC for 100 minutes results in a carbon concentration of 0.75 wt% at a position 0.5mm below the surface. How long would it take to obtain the same concentration at the same position if the heat treatment were conducted at 900 oC?
x12/D1t1= x22/D2t2
Arrhenius equation: D=D0e^(〖-Qd〗∕RT)
Qd = Activation energy of diffusion
D0 = Pre-exponential diffusion factor
R = gas constant = 8.314 J/(mol*K)
Use the Arrhenius equation to calculate D1 and D2.
Calculate the time to satisfy the problem statement.
Chapter 13 Solutions
Foundations of Materials Science and Engineering
Ch. 13.10 - Prob. 1KCPCh. 13.10 - Prob. 2KCPCh. 13.10 - Which is in a lower energy state: (a) elemental...Ch. 13.10 - Give several examples of environmental...Ch. 13.10 - Prob. 5KCPCh. 13.10 - Prob. 6KCPCh. 13.10 - Prob. 7KCPCh. 13.10 - What is an exchange current density? What is the...Ch. 13.10 - Prob. 9KCPCh. 13.10 - Prob. 10KCP
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