Why To Pickle And Passivate

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Pickling Paste

   A UNIQUE PRODUCT FOR FUMELESs PICKLING AND PASSIVATION ON
   STAINLESS STEEL

WHY TO PICKLE AND PASSIVATE ON STAINLESS STEEL

Pickling passivation ensures corrosion resistance to components of stainless steel and thus considerably influences their life and usefulness.

The corrosion resistance of stainess steel is due to the presence of atleast thirteen percent chromium in the alloy. With oxygen, the chromium forms a dense chemically resistant passive layer of chromic oxide protecting the surface of the component against corrosion. The passive layer usually forms again after abrasion. The precondition to corrosion resistance and passive layer is a metallically pure surface with a sufficiently high percentage of chromium.

Every mechanical treatment damages the top layer of components i.e.
-contamination with Ferritic matter,
-change in the structure of the layers,
-development of inbuilt stress,
-reduction of chromium content.

Heat treatment like annealing and welding leads to scaling and discolouration. This not only deteriorates  the appearance of the component but also its corrosion resistance due to the presence of ferric oxides. A continuous passive layer of chromium oxide cannot form here. Hence it is a must to have a metalically
clean and pure surface by pickling before passivation. Corrosive strain on insufficiently passivated stainless steel leads to ;


- pitting corrosion,
- crevice corrosion,
- stress corrosion cracking,
- intercrystalling corrosion and
- corrosion resulting from contact with foreign metals.
Grinding Polishing K-2 Pickling


A dense passive layer can only form on metallically pure surfaces. Professionally pickled passivated stainless steel surfaces and welding seams;

- are metallically pure, free of scales and discolouration,
- have the full corrosion resistance of the component and
- have a decorative metallic appearance.



       

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