Pickling is the removal of any high temperature scale and any adjacent low chromium layer of metal from the surface of stainless steel by chemical means. The lower chromium content gives lower corrosion resistance. To restore the best corrosion resistant performance, the damaged metal layer must be removed, exposing a fully alloyed stainless steel surface. Pickling solutions also remove contaminants such as ferrous and ferric oxide particles. All pickling operations result in metal removal, and the outcome is therefore to some degree a dulling of the visual brightness and perhaps also a significant reduction in dimensions.
For components which can be dipped you can use liquid Pickler SS.
Pickler SS also comes as paste form. It is a very convenient method for pickling Stainless Steel. This is a prepared mix in a stiff paste which enables it to be applied to small areas and to vertical or even overhanging surfaces. It is especially useful for pickling to remove heat tint following welding, the underlying chromium depleted layer as well as residual slag in 10-45 minutes.
If passivation is not carried out, stainless steel can rust due to surface free iron, and since chlorides are also often absorbed from the atmosphere, some ferric chloride will be produced. Prolonged contact with ferric chloride will eventually initiate pitting and crevice corrosion on the stainless steel surface.
PASSIFYER SS enhances the passivation process in a more uniform manner to restore the chrome oxide film and help to prevent future corrosion following installation of the fabricated product. It is used at room temperature, as supplied or can be diluted with one part of water. The time duration varies from 30 minutes to 60 minutes.
PASSIFYER SS also comes both in liquid and paste form.