12) A container made of steel, having base dimensions of 100 x 150 mm and a wall thiickness of 10 filled to a height of 300 mm with a corrosive liquid. A current is produced due to an electrolytic cell. The current is 0.15 Amp. (Density of Fe: 7.8 g/cm, molecular weight of Fe: 55.85 g/mol, number of electrons transferred: 2) mm is (a) Determine the weight loss of the container after 1 year. (b) Determine the decrease of the container thickness after 1 year.

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Questions on Corrosion
12) A container made of steel, having base dimensions of 100 x 150 mm and a wall thickness of 10 mm is
filled to a height of 300 mm with a corrosive liquid. A current is produced due to an electrolytic cell.
The current is 0.15 Amp. (Density of Fe: 7.8 g/cm, molecular weight of Fe: 55.85 g/mol, number of
electrons transferred: 2)
(a) Determine the weight loss of the container after 1 year.
(b) Determine the decrease of the container thickness after 1 year.
13) The density of Al is 2.7 g/cm' and that of Al;O3 is about 4 g/cm'. Describe the characteristics of the
aluminum-oxide film. Compare with the oxide film that forms on tungsten. The density of W is 19.254
g/cm' and that of WO; is 7.3 g/cm'.
14) At 1000°C, pure nickel follows a parabolic oxidation curve given by the constant k= 3.9 × 10~12 cm³/s
in an oxygen atmosphere. If this relationship is nht affected by the thickness of the oxide, calculate the
time required for a 1 mm nickel sheet to oxidize completely.
Winde
Transcribed Image Text:Questions on Corrosion 12) A container made of steel, having base dimensions of 100 x 150 mm and a wall thickness of 10 mm is filled to a height of 300 mm with a corrosive liquid. A current is produced due to an electrolytic cell. The current is 0.15 Amp. (Density of Fe: 7.8 g/cm, molecular weight of Fe: 55.85 g/mol, number of electrons transferred: 2) (a) Determine the weight loss of the container after 1 year. (b) Determine the decrease of the container thickness after 1 year. 13) The density of Al is 2.7 g/cm' and that of Al;O3 is about 4 g/cm'. Describe the characteristics of the aluminum-oxide film. Compare with the oxide film that forms on tungsten. The density of W is 19.254 g/cm' and that of WO; is 7.3 g/cm'. 14) At 1000°C, pure nickel follows a parabolic oxidation curve given by the constant k= 3.9 × 10~12 cm³/s in an oxygen atmosphere. If this relationship is nht affected by the thickness of the oxide, calculate the time required for a 1 mm nickel sheet to oxidize completely. Winde
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