| Objective | To examine the consequences with respect to corrosion when a new pipe is joined to an old pipe. |
| Materials |
An old steel pipe |
| A new steel pipe | |
|
|
|
| Observation |
On joining an old steel pipe to a new steel pipe, corrosion is observed on the new pipe after a few days. Figure shows the corroded surface of a new pipe (right side) after two weeks exposure in 3.5 wt% NaCl solution. |
|
|
|
|
|
|
|
|
|
| Conclusion |
A new pipe should not be joined to an old pipe without proper insulation. |
