Understanding Chemical Passivation
Passivation is the removal of contaminants from the surface grain boundaries of metals such as stainless steel to allow the growth of a natural, inert, oxide layer on the metal. Contaminants such as sulfides (used in manufacturing processes) and free iron inhibit the formation of the oxide layer that protects metals like stainless steel from corrosion. In chemical passivation, nitric or citric acid immersion is used to remove contaminants. When contaminants such as free iron are removed from the metal’s surface, they can no longer react with the atmosphere to form rust.
NEE Chemical Passivation Capabilities
|Nitric Passivation||Citric Passivation|
|Metal Alloys||All Grades of 300 Stainless Steel||All Grades of Stainless Steel|
|Part Sizes||Up to 60″ L x 48″ Dia.||Up to 30″ L x 24″ W|
|Available Corrosion Testing||Copper Sulfate Testing||Copper Sulfate Testing|
|Suitable for Laser-Etched Surfaces||NO||YES|
To thoroughly address your needs, NEE also offers passivation through electropolishing services for the full range of stainless steel alloys.
We are here to help
Tell us about your application requirements. Our knowledgeable staff is ready to meet your needs with the passivation processes best suited to your parts and application. Contact us today. Call 800-672-6616, or complete our brief inquiry form.
Learn more about Passivation Through Electropolishing.