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You are provided with some weight of specimen data as a function of time following exposure...

You are provided with some weight of specimen data as a function of time following exposure of

an alloy specimen to oxygen at high temperature.

(i) Determine whether or not the alloy follows a particular oxidation rate law during the

initial one hour period; if so, specify which one and determine the oxidation rate constant.

(ii) Is there any change in the oxidation rate law in the following 20 hour period? If so,

specify the new law and estimate the oxidation rate constant.

(iii) Account for the change in oxidation rate after 25 hours exposure and calculate the

relevant oxidation rate constant in the period : 25 hours to 100 hours.

Total surface area of specimen : 10cm²

Initial weight of specimen : 1000 mg

Oxidation time Weight of specimen Oxidation time Weight of specimen

(mg) (mg)

1 minute 1000.1 15 h 1023.2

2 minute 1000.2 20 h 1026.3

5 minute 1000.5 25 h 1029.0

20 minute 1001.9 30 h 1029.5

40 minute 1004.1 40 h 1030.0

60 minute 1005.9 50 h 1025.0

2 h 1008.3 70 h 1015.0

3 h 1010.2 80 h 1010.0

4 h 1011.5 100 h 1000.0

10 h 1018.7

(iv) If the corresponding scale thickness data are as follows, plot the relationship between y and t for the full period: 0 to 100 hours.

Oxidation time Scale thickness (µm)

0 minutes 0

5 minutes 0.5

40 minutes 3.9

60 minutes 5.8

10 hours 18.9

20 hours 26.0

25 hours 28.0

30 hours 28.5

Expert Solution

4. Pls follow the plot of q4 of thichness vs time

Amanda K answered 2 years ago

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