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.

Bath stripping

The typical composition is :

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References

(1) - TALBOT (J.) - Les éléments chimiques et les hommes. - 1995, SIRPE Éditeur, France.
(2) - GUILLET (L.) - Rev. Met. 1904,-1-155, 1905 -2-350, 1906-3-372.
(3) - PORTEVIN (A.) -...

Standardization

French Standards Association (AFNOR)

Définition et classification des aciers (A 02-025) - NF EN 10020 - 09-00
Aciers inoxydables. Partie 1 : liste des aciers inoxydables (A 35-572-1) - NF EN 10088-1 - 09-05
Aciers inoxydables. Partie 2 : conditions techniques de livraison des tôles et bandes en acier de résistance à la corrosion pour usage général. (2e tirage, avril 1997) (A 35-573-2) - NF EN 10088-2...