Corrosion Inhibitors. Background & Mechanisms. Applications & Formulating Strategies
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1 Corrosion Inhibitors for Waterborne Alkyd Technology 28 th Biennial Western Coatings Societies Symposium & Show Las Vegas, Nevada October 2007
2 Outline: Corrosion Inhibitors Background & Mechanisms Applications & Formulating Strategies Background & Mechanisms
3 Corrosion Inhibitors
4 What is Corrosion: The electrochemical deterioration of a metal due to the reaction with its environment involving the oxidation of a metal and the reduction of another material.
5 Corrosion Simplified: ELECTRON CONDUCTOR IONIC CONDUCTOR ELECTRON ACCEPTOR Ionic Conductance Electron Conductance
6 The Result: FACTORS INFLUENCING: Presence of Water Presence of Oxygen Presence of Ions Temperature e ph Grain Structure of Metal Stresses from Fabrication
7 Corrosion Cell Diagram: Electron Conductor: Metal Ionic Conductor: Water Electron Acceptor: Oxygen 3/2 O 2 n H 20 2HO 2 2 Fe 2+ Fe 2 O 3 H 2 0 4H + O 2 2 Fe 4 e Anodic Site Cathodic Site
8 How Can We Use Coatings to Protect Metal from Corrosion?:
9 PASSIVE Protect through the barrier properties of resin or pigment having low H 2 O transmission. (i.e. epoxies, chlorinated rubbers) ACTIVE Inorganic Inhibitive Pigments Organic Corrosion Inhibitors Ion Exchange Vapor Phase SACRIFICIAL Zinc-rich primers protect through the preferential oxidation of zinc metal
10 Passivation Mechanism (Active-Direct Inorganic Inhibitor) Specific Example: Zinc phosphate Zn 3 (PO 4 ) 2 - Hydrolysis ys s + - Insoluble FePO 4 Fe 2+ H 2 O Precipitate M x (OH) x Substrate Fe Anode e - Cathode
11 Applications & Formulating Strategies
12 Water Based Alkyds
13 Uses: Lower cost corrosion protection Light duty industrial applications Moderate performance on machinery, tanks, etc. Lower VOC compared to S/B Fast Drying Good adhesion to steel, plastic, & aluminum
14 Types: Water Reducible Alkyds (WRA) COO - COO - COO - COO- COO COO - - COO - COO - COO- COO - COO - COO - COO - Water Dispersible ibl Alkyds (WDA) ACRYLIC POLYMER SHELL ALKYD CORE
15 Properties: Feature Water Reducible Alkyd (WRA) Water Dispersible Alkyd (WDA) Ability to achieve low VOC + ++ High gloss + ++ Hydrolysis resistance + ++ Corrosion resistance ++ + Shear stability - ++ Gloss retention ti ++ + Dry time (wet edge/open time) - - Alkaline resistance - + Moisture resistance - - Gelling with basic pigments - + Drier kick-out resistance ++ - Yellowing - -
16 Hydrolysis of Alkyds: Reversible Reaction in the Presence of Water System ph is critical Amine selection is critical
17 Typical Formulation (Water Reducible Epoxy Ester) INGREDIENTS % WEIGHT FUNCTION Resydrol AX237w/70BG Resin Ammonium hydroxide 0.62 Amine Triethylamine 1.86 Amine Additol VXW Drier Troymax Antiskin B 0.18 Antiskin Patcote Defoamer De-Ionized Water 9.22 RO-4097 Kroma Red 8.32 Pigment Anticorrosive Pigment* 6.02 Corrosion Inhibitor Micro Talc AT Extra 5.23 Filler Millicarb 6.52 Filler Bartex Filler Aerosil Rheology modifier De-Ionized Water TOTAL Fast (25%) Amine Package Slow (75%)
18 Formulating with WRA s: Recommended system ph of Use 100% triethylamine (TEA) for excellent stability & good salt spray resistance. Use a blend of TEA and ammonium hydroxide for good stability & excellent salt spray resistance.
19 Changes to the Amine Package: Water Epoxy Ester - Cold Rolled Steel 2.0 mils hrs SS Best Stability Best Performance 100% Triethylamine 75:25 TEA and Ammonium Hydroxide
20 Stability vs. Amine Package: 4 Heat Aged Stability 50o C /25 50/50 25/75 TEA to Ammonium Hydroxide Ratio
21 Base Strengths via pka & ph: Amine Amine ph 20 C TEA (0.005 N aq. Solution) AMP (2-amino-2-methyl-1-propanol) Ammonia
22 Formulating with WRA s: Effect of Corrosion Inhibitor Zinc phosphate with low levels of zinc oxide showed better corrosion resistance (Salt Spray Testing). Better solvent resistance with Zn than Ca (MEK Double Rubs). Higher electrochemical impedance with Zn than Ca (EIS Testing). Synergy witnessed with organic inhibitor.
23 Formulating with WRA s: Role of zinc oxide Improves the cross link density of film It is an active cathodic inhibitor which works synergistically with zinc phosphate. Can react with mono- & di- carboxylic acid binder breakdown products
24 Corrosion Performance: ZnO 0% 0% 2% 17% MEK
25 Impedance Spectra (Bode Plots): Strontium zinc phosphosilicate p Calcium phosphosilicate Zinc phosphate Blank
26 Inorganic-Organic Corrosion Inhibitor Synergy: Water Reducible Alkyd - Cold Rolled Steel 1.0 mil hrs SS Blank 6% Mod ZnPO4 6% Mod ZnPO4 2% Organic CI
27 Summary: Balancing the amine package is key to formulating hydrolytically stable WR alkyd primers. Modified (i.e., containing ZnO) zinc phosphate pigments provide excellent e corrosion os o resistance sta compared to non-zinc or traditional zinc phosphate corrosion inhibitors. Salt spray and electrochemical impedance corrosion testing correlated well!
28 Acknowledgements Hexion Specialty Chemicals Melissa DeGroot, R&D Chemist Guy Lopez Senior Technical Specialist Natalie Wilson Technical Service Representative High Solids, Waterborne and Latex: Three Approaches to Compliance
29 Contact Information: Andrew Thorn HALOX Technical Service Manager Phone: (219) X 243 Fax: (219) Athorn@halox.com
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