Corrosion Behavior of Austempered Ductile Iron
Zeinab Mohamed Hafez;
Abstract
This investigation aims to study the corrosion behavior of the austempered cast iron in stagnant and flowing seawater.
Different experimental techniques (weight loss and potentiodynamic measurements)
have been used to determine the corrosion behavior of austempered ductile cast iron under the conditions of
I. Different austempering temperatures (250 C and 375 C).
2. Different alloys addition (Mo and Ni).
3. Different solution velocities (0, 500, and 700 rpm).
4. Different solution temperatures (20, and 40c)
5. Different solid particles addition (sand and clay).
The optical microscopy and SEM have been used to recognize the degree and nature of the corrosive attack on the surface of the corroded specimens.
The results of the present investigation indicate that the corrosion rate decreases by austempering heat treatment and the corrosion rate of the ductile cast iron austempered at
250 °C is lower than of that austempered at 3 75 °C. The corrosion rate of austempered ductile iron decreases with the alloys addition and increases by increasing the solution velocity or temperature.
The comparison of corrosion rates of austempered ductile iron with and without alloying element was made with those of carbon steel and Ni -- resist alloy at the same conditions.
It was found that the corrosion rates of austempered ductile iron at different conditions is
lower than those of carbon steel but higher than of Ni -- resist alloy at the same conditions
The corrosion rates of both steel and ADI are affected by solid particles additions. The corrosion rate of steel in rotating solution increases with the presence of sand.
Different experimental techniques (weight loss and potentiodynamic measurements)
have been used to determine the corrosion behavior of austempered ductile cast iron under the conditions of
I. Different austempering temperatures (250 C and 375 C).
2. Different alloys addition (Mo and Ni).
3. Different solution velocities (0, 500, and 700 rpm).
4. Different solution temperatures (20, and 40c)
5. Different solid particles addition (sand and clay).
The optical microscopy and SEM have been used to recognize the degree and nature of the corrosive attack on the surface of the corroded specimens.
The results of the present investigation indicate that the corrosion rate decreases by austempering heat treatment and the corrosion rate of the ductile cast iron austempered at
250 °C is lower than of that austempered at 3 75 °C. The corrosion rate of austempered ductile iron decreases with the alloys addition and increases by increasing the solution velocity or temperature.
The comparison of corrosion rates of austempered ductile iron with and without alloying element was made with those of carbon steel and Ni -- resist alloy at the same conditions.
It was found that the corrosion rates of austempered ductile iron at different conditions is
lower than those of carbon steel but higher than of Ni -- resist alloy at the same conditions
The corrosion rates of both steel and ADI are affected by solid particles additions. The corrosion rate of steel in rotating solution increases with the presence of sand.
Other data
| Title | Corrosion Behavior of Austempered Ductile Iron | Other Titles | السلوك التاكلى لحديد الزهر الاوستيمبرى | Authors | Zeinab Mohamed Hafez | Issue Date | 2001 |
Attached Files
| File | Size | Format | |
|---|---|---|---|
| B17244.pdf | 1.79 MB | Adobe PDF | View/Open |
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