APCS presentation on corrosion mechanism.pdf - Halox

What is Corrosion?The electrochemical deterioration of a metal due tothe reaction with its environment.RustFe 2 O 3 . H 2 O3/2 O 2n H 2 O2 Fe 2+2 H 2 O4 H + O 22 Fe 4 e -Anodic Site Cathodic Site

Metal◦ Passivation or adhesion Oxygen◦ Reduction of active oxygen Water◦ Water resistant systems Ions◦ Reduction of ion concentration and mobility

HALOX ® ChemistriesStrontium, Zinc PhosphosilicateAmino carboxylateZirconium CarbonateToluoyl Propionic Acid–Amine ComplexPhosphocarbonatesNitritesDi-hydroxybenzene derivativesSodium Aluminate Sol-GelBTSA SaltBenzothiazoyl succinic acidSol-Gel ChemistriesZinc PhosphateCalcium BorosilicatePolymeric amine saltBorate and Phosphate EstersCalcium phosphate - Anion Exchange

HALOX ® Chemistries Inorganic◦ Special mineral salt◦ Special mineral salt + ion exchange Organic◦ Organic acid + amine complexes◦ Specialty organic acid Hybrid◦ Inorganic + organic◦ Sol-gel technology

Very low water solubility and ion dissociationconstant

-+- + -+ +-++-+--M x (PO 4 ) y+HydrolysisPaint Film-Fe 2+H 2 OFePO 4PrecipitateM(OH) xSubstrateFeAnodee -Cathode

Effective through passivation of metalsurfaces Takes water to be effective Takes time to be effective, good for longterm corrosion inhibition; not effective onshort term, such as flash rust prevention. Effectiveness varies depending on solubilityof mineral in specific resin and additivesystem

Ion-scavengingmechanism inaddition topassivation of metalsurfaces Limiting two factorsof electro-chemicalreactionIon Scavenge

HALOX ® 510 HALOX ® 570 Passivation of metal surface Anti-oxidation through free radicalquenching

HALOX ® 650Substrate Passivation of metal Anti-oxidation through free radicalquenching

Built in Synergy◦ Inorganic/Organic Hybrid Multi-System Performance◦ Performs in both water andsolvent borne Excellent Passivation◦ Improved Wet Adhesion Outstanding blister resistance Enhanced barrier propertiesSNSOOOHHO

Improve crosslink density within coating layerto reduce water diffusion and ion mobility Improve adhesion between coating and metalsurfaces

Anti-corrosion has to have a systematicapproach, addressing multiple factorscontributing to corrosion No universal product works on all occasions Resin, coatings formulation and corrosioninhibitors all contribute to the anti-corrosionproperties of the coatings.