Beta-Radiation-Resistant Anticorrosion Coatings Based on Lignin.

Area of Science:

• Materials Science
• Surface Chemistry
• Radiation Physics

Background:

• Developing radiation-stable coatings is crucial for space exploration.
• Existing coatings degrade under beta radiation and corrosive conditions.
• Biobased materials offer sustainable alternatives for extreme environments.

Purpose of the Study:

• To present a novel lignin-based coating with exceptional radiation resistance and anticorrosion properties.
• To evaluate the stability and performance of lignin coatings on copper substrates after electron beam irradiation.
• To explore the potential of lignin as a sustainable material for protective coatings in harsh environments.

Main Methods:

• Application of lignin-based coatings to copper substrates.
• Exposure to 500 kGy electron beam irradiation in air.
• Structural analysis using spectroscopy, microscopy, and thermogravimetry.
• Anticorrosion efficiency testing in sulfuric acid and sodium chloride solutions.
• Measurement of adhesion strength and water contact angle.

Main Results:

• Lignin coatings maintained structural integrity and high anticorrosion efficiency (up to 99.8%) after irradiation.
• Thicker films (61 μm) showed superior protection compared to thinner films (9.5 μm).
• Irradiation enhanced adhesion strength and increased hydrophilicity of the coatings.
• Performance is attributed to lignin's aromatic structure and thermal cyclization, resisting radiation-induced degradation.

Conclusions:

• Lignin-based coatings demonstrate remarkable stability and protective capabilities under beta radiation.
• These biobased coatings are a viable, sustainable solution for protecting metal surfaces in extreme environments, including space.
• The findings support the use of lignin in developing advanced materials for challenging applications.