Microcapsule-based self-protecting coatings
type: CreativeWork
description: Corrosion causes enormous damage to products and infrastructure on an annual basis. The most common approach to mitigate corrosion is to apply a protective coating (layer) to the targeted “substrate” well before placing the item in service. The protective coating acts as a passive layer between the protected substrate and the corrosive environment. Generally, the protective layer includes additive(s) that are “sacrificial” with a much higher propensity to corrode than the target substrate material. For steels typical additives include zinc compounds, manganese and other alloying elements. More recently, self-protective coatings have been introduced using microencapsulated anti-corrosion chemicals and compounds that are released on demand at the site of active corrosion. Once triggered via capsule release, the passive coating later is activated thereby intervening in the corrosion reaction and mitigating its effects. Unfortunately, the best ant-corrosion coatings are environmentally hazardous and in some cases carcinogenic (e.g. chromates). Is there a viable coating system that is based on the microcapsule motif, yet retains high performance and is environmentally friendly (green chemistries)? This is the central question of this thesis. Here we introduce and develop an environmentally-friendly, anti-corrosion protective polymer coating for use with steel substrates. The anticorrosive performance as assessed in controlled laboratory conditions using industry standards is on par with the best commercially available systems at a fraction of the cost. We take advantage of the natural “anti-corrosion” properties of lawsone, an extract of the hemp plant, and use this as the core payload for our anticorrosion microcapsules. The capsules are made an internal phase separation technique with a polyurethane shell wall and a maximum core loading of 8 wt% with respect to a benign core (carrier) solvent. In some cases a water-based epoxy coating was used containing no volatile or…
abstract: Corrosion causes enormous damage to products and infrastructure on an annual basis. The most common approach to mitigate corrosion is to apply a protective coating (layer) to the targeted “substrate” well before placing the item in service. The protective coating acts as a passive layer between the protected substrate and the corrosive environment. Generally, the protective layer includes additive(s) that are “sacrificial” with a much higher propensity to corrode than the target substrate material. For steels typical additives include zinc compounds, manganese and other alloying elements. More recently, self-protective coatings have been introduced using microencapsulated anti-corrosion chemicals and compounds that are released on demand at the site of active corrosion. Once triggered via capsule release, the passive coating later is activated thereby intervening in the corrosion reaction and mitigating its effects. Unfortunately, the best ant-corrosion coatings are environmentally hazardous and in some cases carcinogenic (e.g. chromates). Is there a viable coating system that is based on the microcapsule motif, yet retains high performance and is environmentally friendly (green chemistries)? This is the central question of this thesis. Here we introduce and develop an environmentally-friendly, anti-corrosion protective polymer coating for use with steel substrates. The anticorrosive performance as assessed in controlled laboratory conditions using industry standards is on par with the best commercially available systems at a fraction of the cost. We take advantage of the natural “anti-corrosion” properties of lawsone, an extract of the hemp plant, and use this as the core payload for our anticorrosion microcapsules. The capsules are made an internal phase separation technique with a polyurethane shell wall and a maximum core loading of 8 wt% with respect to a benign core (carrier) solvent. In some cases a water-based epoxy coating was used containing no volatile or…
author: Odarczenko, Michael T.
language: en
keywords: self-healing, self-protecting, anti-corrosion, polymer coating, corrosion, electrochemical, microcapsules, UV curable, lawsone
date published: 2018-09-04T20:36:42Z
date modified: 2026-07-22T22:24:38Z
provider: University of Illinois - Urbana-Champaign
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: University of Illinois at Urbana-Champaign

PropertyValue
property ID: Handle
value: http://hdl.handle.net/2142/101180