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• Nature Of Business: TRADER
• Our Chemical R & D Lab:

PRODUCTS FOR SS SURFACE TREATMENTS
• Do You know:

S-2 CARE HELPS YOU TO RESTORE THE PROPERTIES OF STAINLESS STEEL
• By Mechanical Polishing the original surface of stainless steel get disturb as the ground surface of stainless steel is always having a tensile protective layer.
• After Mechanical abrasion ferrous ions got exposed in nature since, its necessary to do Passivation which causes a surface film formation on Stainless Steel Surface to lose its chemical reactivity.
• The corrosion resistance of stainless steel is due to passiveChromium – Rich complex oxide film that forms naturally on the surface of the Stainless Steel.

By S-2 Care, Pickling & Passivation process will assure the optimum restoration of the chrome oxide passive layer.

Why pickling & Passivation necessary:

Stainless Steel Behavior:
Stainless steel is essentially the group of iron alloy which exhibit significant resistance to corrosion. Stainless Steel is composed of at least 68% iron, 10.5% chromium and less than 1.2% carbon. The chromium properties provide stainless steel with superior corrosion resistance. Additional elements are: Nickel, Titanium, Copper and Molybdenum.

NOTE: The addition of Nickel makes steel “Stainless”.
Due to affinity of chromium it combines with oxygen & form Chromium-Oxide which becomes tenacious (strongly attached to the surface of SS) and self renewing. This layer is only about 130 angstroms (1A = 10-10m) thick and protects the base stainless steel from corrosion. The self renewing property of the film means that if the film gets removed or damaged (as happens when the surface is machined or scratched), the film forms again by itself! All that is required is oxygen which, as we know, is present in air ! This is what makes stainless steel special.

The iron particle rusts initially and chlorides from the atmosphere will then combine with the corrosion products forming ferric chloride which in turn makes stainless steel corrode.

PICKLING:

• As we know that the underground/base steel are coated with a thin film of Chromium Oxide which creates a barrier in the formation of rust and also to the moisture. But during various steel fabrication processes like heat treatment (heat tint), weld scale, Rust (discoloring oxide layer caused due to the expose of free ferrous atoms to the surrounding atmosphere).
• All these fabrication practices removes the Chromium Oxide layer from Stainless steel surface & cause the corrosion of stainless steel. To stop this contamination of ferrous ions and to increase corrosion resistance, We need to pickle the surface by the help of pickling process.

SUMMARY:
Pickling(Chemical de-scaling) of stainless steel is required to remove scale, heat tint & to create the self-repairing oxide film on surface which enables it to become more passive and corrosion resistant.

PASSIVATION:

• To remove the presence free ferrous ions, oxide-scale, rust ferrous particles, metal chips or other non-volatile deposits will promote pitting corrosion at the cells set up between the “free” iron and stainless steel. Mechanical action, embedded iron particles, or oxygen starvation can easily occur in the workshop or during fabrication. Surface-free iron particles, dust, grit, and iron-oxide contaminants arise from handling, fabrication/forming, welding, grinding, machining, paint, crayon marks, polishing, tumbling, and workshop cross contamination.
• This affects the chemical behavior of stainless steel or disturbs its surface free ions behavior. Due to which the contaminants penetrate the passive film, absorb and generate chlorides, ferric chloride, or produce inorganic chlorides by decomposition of organic compounds, such as PVC and marking materials. Passivation also aids in the rapid development of the passive surface layer on the steel.

SUMMARY:
Proper Passivation with a nitric acid-based agent will dissolve surface contamination and assist in the optimal restoration of the chrome-oxide passive layer. 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. Failure of stainless components due to corrosion can reach catastrophic proportions. The cost in time, materials, rectification, and lost production can be tremendous.