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The need for refurbishment
Corrosion
- Radiators can and frequently do suffer from internal corrosion when moisture and acidity build up in the insulating oil, causing them to rust from the inside out.
- External corrosion also occurs regularly, especially when the radiators are located in harsh environments; they are not galvanized; or, they have been coated initially with inadequate or inappropriate paint systems.
Erosion is evident on these radiators received for refurbishment
Delamination
- Painting protects radiators from deterioration.
- However, their fin structure makes it impossible to abrade all surfaces to ensure proper paint adhesion.
- As a result the new paint adheres by skin friction only and delamination is inevitable.
- Re-painting is therefore needed at times during the working life of a radiator.
- Incompatible paint systems may also result in delamination when:
- new paint coatings are sprayed on site on top of the old coating.
- galvanized surfaces are incorrectly prepared.
- the coating system has been incorrectly specified or applied.
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| Examples of fin structure on transformers and radiators | |
Design Faults
- Design problems in fin and header tank construction can also lead to problems with radiators.
- Welding may leave gaps between surfaces.
- Crevices, if not properly sealed, allow moisture to enter and corrosion to commence.
Repairs to corroded radiator fins in progress