7. Finishing treatments
They mainly concern welded joints (and heat-treated parts) which, depending on the process, may be coated with oxides. The presence of these oxides means the absence of a passive layer, and therefore greatly reduced corrosion resistance. With certain welding processes (resistance welding), the surface of the material is virtually unaltered, and brushing may suffice. Otherwise, a pickling-passivation treatment is required.
7.1 Stripping
When the welded joint or an entire part is covered with colored oxides, they must be removed to restore the alloy's passive character.
Several techniques can be used.
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Bath stripping
The typical composition is :
- ...
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Finishing treatments
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