Evaluation of the Protective Properties of Novel Chromate-Free Polymer Coatings Using Electrochemical Impedance Spectroscopy

Processing, Adhesion and Corrosion-inhibiting Properties of Poly[2-methoxy-5-(2’-ethylhexyloxy)-1,4-phenylene vinylene], (MEH-PPV) on Aerospace Aluminum Alloys

“…An EAP derivative of poly(p-phenylene vinylene), specifically poly(2,5-bis(N-methyl-N-hexylamino)phenylene vinylene)(BAM-PPV) that was synthesized and coated onto an aluminum alloy (AA2024-T3) passed laboratory corrosion testing and survived a one-year field study. These studies confirmed that BAM-PPV provided corrosion protection for AA2024-T3 alloy via a passivation mechanism and can be used as a pretreatment coating replacement for CCC's [18][19][20].…”

Smart Inorganic and Organic Pretreatment Coatings for the Inhibition of Corrosion on Metals/Alloys

“…There are several proposed mechanism(s) by which CPs can potentially inhibit corrosion of aluminum alloys in corrosive aqueous environments. This compound, poly(2,5-bis(N-methyl-N-hexylamino)phenylene vinylene) (BAM-PPV), (Figure 3.5) was shown to have promise as a viable nontoxic, environmentally friendly alternative to CCCs as reported by Zarras et al [182][183][184][185][186][187][188] The neutral salt fog laboratory results showed that BAM-PPV coated on aluminum alloy could meet the military requirement as a replacement for CCCs. 176 Most of the investigations into the corrosion-inhibiting properties of CPs have contained either a nonconductive primer and/or topcoat for enhanced corrosion protection.…”

“…170,171 The corrosion protection mechanism for aluminum alloys is still under intense investigation. [178][179][180][181] Researchers at the Naval Air Warfare Center Weapons Division, China Lake, CA synthesized, 182-184 coated, and evaluated a CPs performance both in laboratory 103,185,186 and field testing environments, 187 which was directly compared to CCC. 172 These proposed mechanism(s) are as follows: (1) ennobling of the aluminum alloy, 173 (2) anodic protection/passivation, 174 (3) galvanic and ion-exchange release of oxygen reduction inhibitors, 175 and (4) barrier protection by the reduced form of the CP following an initial galvanic coupling.…”

Evaluation of the Protective Properties of Chromate-free Polymer Coatings on Steel and Aluminum Samples Using EIS

“…The first set of samples included steel panels coated with pentasiloxanes where different crosslinking/cure chemistries were compared for their effect on the protective properties of the coatings [1][2][3][4]. The second set contained Al 2024 coated with a BAMPPV (bisaminomethyl-polyphenylene vinylene) based powder coating that was developed as a replacement for coatings containing chromate [5]. Samples were exposed to 0.5 N NaCl and EIS data were recorded as a function of exposure time.…”