Passivation
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By Chemically Removing Free Irons From The Surface Of Stainless Steel, The Passivation Process Adds A Thin Oxide “Film” Layer. Less Iron At The Surface Means More Chromium. More Chromium Means A Thicker Chromium Oxide Surface When The Stainless Steel Is Exposed To Air (Oxygen). Therefore That Thicker, Chemically Non-Reactive Surface Has More Protection Against Rust.
Per Common Passivation Specifications ASTM A380 And A967, Passivation Is “The Removal Of Exogenous Iron Or Iron Compounds From The Surface Of Stainless Steel By Means Of A Chemical Dissolution, Most Typically By A Treatment With An Acid Solution That Will Remove The Surface Contamination, But Will Not Significantly Affect The Stainless Steel Itself.” Further, ASTM A380 States Passivation Is “The Chemical Treatment Of Stainless Steel With A Mild Oxidant, Such As A Nitric Acid Solution, For The Purpose Of Enhancing The Spontaneous Formation Of The Protective Passive Film.” Therefore, A “Mild Oxidant”, Such As A Nitric Acid Or Citric Acid (Mineral Or Organic Acid Solution), Removes The Excess Iron And Associated Contaminants From The Surface Of The Stainless Steel And Allows The Formation Of A Chromic Oxide Layer When Exposed To Air, Which Thus Leads To Stainless Steel’s Corrosion-Resistant Properties. |
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Specs & Attributes
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