Learn What is Passivation of stainless steel, how Passivation is done, and how it improves corrosion resistance. Buy stainless steel washers online in india on www.fastdep.in
Why Passivate Stainless Steel? #
Passivation is a widely surface treatment process to improving corrosion resistance parts made of stainless steel, titanium and tantalum. For stainless steel parts passivation only occurs if the mixture of chromium is high enough.
The finished stainless steel parts may have iron compounds on the surface that are likely to chemically react with air, causing corrosion and leading to rust. These iron atom can be removed using Passivation chemical process.
- Chemical film barrier against rust
- Extended life of the product
- Removal of contamination from product surface
- Reduced need for maintenance
Passivation Process #
In passivation process the stainless steel are immersed in acid bath (nitric acid or citric acid) which dissolves free iron from the surface while leaving the chromium intact. The passivation process removes of free iron compounds or other foreign matter from the surface.
The acid bath creates higher proportion of chromium at the surface allows for the formation of a thicker, more protective chromium oxide layer. Removal of free iron from the surface removes opportunities for corrosion to start. The resulting passive layer provides a chemically non-reactive surface that protects against rust.
The Passivated stainless steel resists rust. Since there is not corrosive materials present at the top layer.
ASTM A967 and AMS 2700 are the industry standards for Passivating stainless steel, titanium and other materials
