Design of Polymeric Corrosion Inhibitors Based on Ionic Coumarate Groups

Area of Science:

• Materials Science
• Corrosion Science
• Polymer Chemistry

Background:

• Corrosion of mild steel causes significant financial losses.
• Development of efficient, eco-friendly organic corrosion inhibitors is crucial.
• Existing inhibitors may face challenges like leaching and limited effectiveness in coatings.

Purpose of the Study:

• To synthesize and characterize monomeric ionic coumarate corrosion inhibitors.
• To integrate these inhibitors into polymeric acrylic UV coatings.
• To evaluate the anticorrosion performance of coumarate inhibitors integrated via different methods.

Main Methods:

• Synthesis of two methacrylic monomers and one nonpolymerizable ionic coumarate compound.
• Investigation of anticorrosion properties in chloride aqueous solutions using various techniques.
• Integration of coumarate compounds into acrylic UV polymer compositions (standalone, ionic attachment, covalent attachment).

Main Results:

• UV coatings with covalently or ionically attached coumarate groups exhibited superior anticorrosion performance.
• Coatings with coumarate compounds as nonreactive additives showed leaching issues, limiting their effectiveness.
• The study demonstrates the efficacy of combining polymer barrier properties with organic inhibitor functionality.

Conclusions:

• Polymeric corrosion inhibitors offer a powerful strategy for corrosion prevention.
• Covalent or ionic attachment of coumarate inhibitors to acrylic polymers enhances durability and performance.
• This approach effectively mitigates corrosion degradation in mild steel materials.