e Chem offers Passivation systems for both Citric Acid and Nitric Acid based approaches
Equipment: Tanks and Scrubbing Systems (where needed)
Chemistry: Cleaners and Passivation Products
Environmental Regulatory assistance where required
What Is Passivation?
•Passivation is the process of making a material “passive” or unreactive by chemical removal of free iron on the exposed surface of the part.
•Stainless steel is stainless because of the protective oxides in the metal composition. If those oxides are removed by scouring, by reaction with bleach, or cutting, then the iron in the steel is exposed and can get rusted.
•Stainless steel is also vulnerable to contamination by tool/mild carbon steel, the kind found in on cutting bits, grinding wheels, buffing compounds, and steel wool.
•Both Citric and nitric acid passivation, while different mechanisms, protect the treated surfaces from unwanted oxidation/rusting. Standard: ASTM A967: Standard Specification for Chemical Passivation Treatments for Stainless Steel Parts.