TiN Composite Carbon Dot Inhibitor

Effective in saline-alkali conditions

Forms a dense protective layer in saline-alkali environments with high chloride and strong alkali, providing efficient corrosion inhibition for carbon steel.

Peng, Qin · Xiang, Tengfei · Cai, Fei · Xia, Wei · Zhenya, Zhang · Gyawali, Gobinda · Zhang, Shihong

Journal of Colloid and Interface Science 2026

Specifications

Corrosion current density

{'zh': '0.649', 'en': '0.649'} μA/cm²

Cl⁻ diffusion coefficient

{'zh': '3.17 × 10⁻¹²', 'en': '3.17 × 10⁻¹²'} m²/s

Advantages

Effective in high-alkali saline media

In a harsh medium of 0.6 M KOH + 0.2 M NaOH + 3.5 wt% NaCl + saturated Ca(OH)₂, a dosage of 100 mg/L lowers the corrosion current density to 0.649 μA/cm².

Blocks chloride ion penetration

Molecular dynamics simulations show the Cl⁻ diffusion coefficient drops from 1.71 × 10⁻⁹ m²/s to 3.17 × 10⁻¹² m²/s, indicating the adsorbed layer effectively blocks chloride transport to the metal surface.

Forms a dense protective layer

Atomic force microscopy reveals a tightly-packed anti-corrosion layer established by TiN@Ma-CDs on the carbon steel surface, providing a physical barrier.

Applications

• Corrosion inhibitors：Adding 100 mg/L drastically reduces carbon steel corrosion current in saline-alkali conditions.
• Metal surface protective coatings：Forms a dense adsorbed layer on metal, replacing or reinforcing traditional coatings.
• Reinforced concrete protection：Tailored for high-alkali concrete pore solution, inhibiting chloride diffusion to protect rebar.
• Functional carbon dots：Carbon dots serve as a carrier for TiN, enabling superior corrosion inhibition under harsh conditions.