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Corrosion Performance of Chemically Modified Multiwall Carbon nanotube Epoxy-Amine Coating Systems on Steel Substrates

Corrosion Performance of Chemically Modified Multiwall Carbon nanotube Epoxy-Amine Coating Systems on Steel Substrates
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Carbon nanotubes are well-known for their ability to improve critical properties of polymeric materials. Our research objective is to quantify the influence of incorporating multi-walled carbon nanotubes (MWCNT) modified with amine, hydroxyl, or epoxy functionalities on the corrosion performance of epoxy amine coatings on steel substrates. 

Product Number: 41216-956-SG
Author: Greg W. Curtzwiler, Eric B. Williams, Christina M. Konecki, Steven M. Wand, James W. Rawlins
Publication Date: 2016
Industries: Corrosion Monitoring and Control , Coatings , Coatings and Linings
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Carbon nanotubes are well-known for their ability to improve critical properties of polymeric materials. Our research objective is to quantify the influence of incorporating multi-walled carbon nanotubes (MWCNT) modified with amine, hydroxyl, or epoxy functionalities on the corrosion performance of epoxy amine coatings on steel substrates. Coated substrates were exposed to ASTM B117 for 168 hours and were analyzed via optical imaging as a function of time. After 168 hours, the coatings were removed from the substrate and the substrate/coating interface was investigated by scanning electron microscopy (SEM) - energy dispersive X-ray spectroscopy (EDS). Coatings that contained MWCNTs reduced the rate of corrosion compared to coatings with without MWCNTs, however the corrosion resistance was statistically insignificant between formulations containing MWCNTs. SEM-EDS analysis showed a reduction in the frequency of corrosion products and corrosion-inducing NaCl at the coating/substrate interface of MWCNT formulations compared to without MWCNTs. It is hypothesized that the reduced amount of corrosive species at the coating/substrate interface is attributed to increased ion tortuosity from interactions between the permeating ions and the MWCNTs.

Carbon nanotubes are well-known for their ability to improve critical properties of polymeric materials. Our research objective is to quantify the influence of incorporating multi-walled carbon nanotubes (MWCNT) modified with amine, hydroxyl, or epoxy functionalities on the corrosion performance of epoxy amine coatings on steel substrates. Coated substrates were exposed to ASTM B117 for 168 hours and were analyzed via optical imaging as a function of time. After 168 hours, the coatings were removed from the substrate and the substrate/coating interface was investigated by scanning electron microscopy (SEM) - energy dispersive X-ray spectroscopy (EDS). Coatings that contained MWCNTs reduced the rate of corrosion compared to coatings with without MWCNTs, however the corrosion resistance was statistically insignificant between formulations containing MWCNTs. SEM-EDS analysis showed a reduction in the frequency of corrosion products and corrosion-inducing NaCl at the coating/substrate interface of MWCNT formulations compared to without MWCNTs. It is hypothesized that the reduced amount of corrosive species at the coating/substrate interface is attributed to increased ion tortuosity from interactions between the permeating ions and the MWCNTs.

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