Polycarboxylate Inhibitors
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1 Polycarboxylate Inhibitors May 2018 Presented to: Potential Licensees NAVAIR Public Release Distribution Statement A: Approved for public release, distribution is unlimited Presented by: Craig Matzdorf NAWC-AD Senior Engineer
2 Background Polycarboxylate inhibitors show promise as inhibitors for improving the performance of Al-rich and other metalpigmented primers as well as on their own in primers and other applications Combinations of inhibitors have been discovered to perform synergistically Inhibitors have been assessed electrochemically in solution and as additives to Al-rich primer Additional polycarboxylate compounds are being studied by themselves and in combinations to optimize the best combinations for primer applications on steel, aluminum and both (mixed metals)
3 Definitions LP6-F58: base Al-rich composition with no additives. This composition is most sensitive to and most effective to highlight the effect of additives. LP6-FQ58: best Al-rich composition with alternative additives Inhibitor Blend 1: Mixture of Compounds 1 and 2 as shown in slide 7. Compounds 1 and 2 are two different polycarboxylates with the same cation. (focused on maximum corrosion resistance of aluminum and steel) LP-RED4.2: modified version of LP6-F58. Similar corrosion performance without additives. Inhibitor Blend 2: Blend 1 plus an additional compound (focused on maximum corrosion resistance of aluminum)
4 Results on Steel Coated with Al-rich Primer Phosphated steel panels after 30 cycles (days) of GMW (MIL-DTL Type IV test duration) LP6-F58 control LP6-FQ58 control LP6-F58 with Inhibitor Blend 1
5 Results on Aluminum Coated with Al-rich Primer 2024-T3 aluminum panels with Type II conversion coating after 83 days/cycles of GMW LP6-F58 control LP6-F58 with Inhibitor Blend 1 LP6-FQ58 control
6 Results on Aluminum Coated with Al-rich Primer 2024-T3 aluminum panels with Type II conversion coating after 2000 hours of ASTM B117 LP6-F58 control LP6-F58 with Inhibitor Blend 1 LP6-FQ58 control
7 Steel Electrochem Samples after Testing No inhibitor- anodic scan ph Compound 1- anodic scan ph Compound 2- anodic scan ph Blend 1- anodic scan ph No inhibitorcathodic scan ph Compound 1- cathodic scan ph Compound 2- cathodic scan ph Blend 1- cathodic ph
8 Blend 2 Results 2024-T3 aluminum panels with Type II conversion coating after 2000 hours of ASTM B117 and 104 cycles (2500 hours) GMW exposure LP-RED4.2 B117 control ASTM B117 GMW 14872
9 Electrochemistry of Inhibitors in Solution Polarization data and pictures show a large decrease in current output for steel and aluminum and impressive inhibition in 3.5% salt water solution (decrease in current) for Inhibitor Blend 2 Control Blend 2
10 Opportunity A wide variety of solubilities and chemical combinations is possible to tailor to applications of interest Compounds have low toxicity and support the elimination of hexavalent chromium and zinc from corrosion-inhibiting coatings
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