Damage-Tolerant Wood Layers for Corrosion Protection of Metal Structures

Area of Science:

• Materials Science
• Corrosion Engineering
• Sustainable Materials

Background:

• Developing mechanically robust and damage-tolerant corrosion protection layers is crucial for industrial applications.
• Existing high-performance corrosion protection layers often lack sufficient mechanical properties or sustainability.
• Achieving high modulus (>1.5 GPa) and tensile strength (>100 MPa) simultaneously in protective coatings remains a challenge.

Purpose of the Study:

• To investigate the potential of densified wood veneer as a component in advanced corrosion protection systems.
• To evaluate the mechanical properties, ion diffusivity, and self-recovery capabilities of wood-based corrosion protection structures.
• To demonstrate the efficacy of the developed wood corrosion protection structure (WCPS) in preventing steel corrosion.

Main Methods:

• Densification of wood veneer to achieve enhanced mechanical properties.
• Fabrication of a wood corrosion protection structure (WCPS) utilizing densified wood veneer as an intermediate layer.
• Evaluation of mechanical properties (Young's modulus, tensile strength) and corrosion resistance via salt spray testing.
• Assessment of metal ion diffusivity and self-recovery from mechanical damage.

Main Results:

• A 130 μm thick densified wood veneer achieved a Young's modulus of 34.49 GPa and tensile strength of 693 MPa.
• The WCPS demonstrated low diffusivity for metal ions and self-recovery from mechanical damage.
• Corrosion rate of low-carbon steel protected by WCPS was reduced by two orders of magnitude compared to state-of-the-art layers.
• The densified wood veneer proved to be a mechanically strong and sustainable alternative for corrosion protection.

Conclusions:

• Densified wood veneer can be engineered into a highly effective and sustainable corrosion protection layer.
• The developed wood corrosion protection structure (WCPS) offers superior mechanical strength, damage tolerance, and corrosion resistance.
• This research opens new avenues for sustainable corrosion protection design using engineered wood-based materials.