Chemical, electro-chemical and mechanical stainless steel surface treatment

|Stainless steel’s resistance to corrosion

Each second, almost 5 tonnes of steel are transformed into iron oxide! This shows just how important the corrosion phenomenon is for the industry.

Stainless steel has the remarkable property of being resistant to corrosion. A steel is said to be stainless if it contains a minimum of 10.5% chromium and a maximum 1.2% carbon.

By preferentially attaching itself to the iron on the steel’s surface, chromium is predominantly responsible for the stainless steel’s resistance to corrosion. This layer forms naturally on the surface of the stainless steel and is commonly called the “passive layer”.

 

|Technochim, tailor-made stainless steel treatments

To restore or keep the passive layer’s properties or limit the activation risks in some places, it may be necessary to carry out different surface treatments.

Chemical treatments

- Alkaline degreasing, acid degreasing or degreasing by solvent

- Fluonitric pickling

- Passivation with nitric acid or citric acid

- De-rouging

Electro-chemical treatments  

- Electrolytic polishing, electro-chemical polishing or electro-polishing

Mechanical treatments

- Shot blasting

- Mechanical polishing with different grains

- Brushing