Vol. 42, Iss. 1

This study explores the development of a durable anti-corrosion coating for marine environments by chemically modifying water-based polyurethane (PU) with organosilicon. Polydimethylsiloxane (PDMS) was used as a functional monomer, reacting with methyl diisocyanate (MDI), polyethylene glycol 1000 (PEG1000), and dimethylolpropionic acid (DMPA) to synthesize an organosilicon-modified PU (SiPU) emulsion. The SiPU exhibited an initial decomposition temperature of 331 °C—91 °C higher than unmodified PU—and a slightly lower glass transition temperature (\(-32.8^\circ\)C), indicating improved thermal flexibility. Coatings prepared with PDMS-g-PA composites showed significantly higher impedance and larger Nyquist arcs after 35 days in 0.1 mol/L HCl. The 5% PDMS coating (P-5) achieved the highest adhesion grade (5A) and showed a 35.08% increase in bond strength. Under varying chloride conditions, P-5 maintained a stable open-circuit potential and lower corrosion current density over 30 days, confirming enhanced adhesion, thermal stability, and corrosion resistance.

This study selected reinforced water-based epoxy micaceous iron oxide intermediate coating (X1), water-based epoxy micaceous iron oxide intermediate coating (X2), and water-based epoxy zinc-rich primer (X3) as research objects, and systematically investigated the adhesion and corrosion resistance of the three water-based epoxy anti-corrosion coatings on different metal surfaces. Through adhesion testing and corrosion resistance experiments, the performance of different coatings was evaluated. Based on electrochemical test results, the corrosion resistance mechanism of the X1 coating was revealed. The X1 coating demonstrated the best overall performance. From day 0 to day 15, the charge transfer resistance of the X1 coating gradually increased, reaching a maximum value of 1653.85 \(\Omega\)·cm\(^{-2}\) on day 15, at which point the electrochemical corrosion reaction on the coating surface was slowest.

Environmentally friendly coatings drive systematic upgrades and value creation in industrial equipment protection. This paper combines the multiple key performance characteristics of environmentally friendly coatings in industrial equipment protection with experimental research and testing to study the optimal coating mixture ratio and actual application effects. Using modified cycloaliphatic amines as a base, solvent-free industrial equipment coatings and coatings are prepared, and comprehensive testing of surface structure, physical properties, and chemical properties is conducted to evaluate coating performance levels. Experiments show that within a curing time of 0–360 seconds, the coating viscosity remains stable, and as the temperature increases from 30°C to 90°C, the decrease in coating viscosity ranges between 0–10 Pa·s. When the mixing ratio of modified cycloaliphatic amine/epoxy resin coating is 10\%, the coating’s bond strength and adhesion are 50.46 and 16.99 MPa, respectively, with wear resistance of only 39.68 MPa. The water absorption rate and chloride penetration rate are both lower than those of other ratios. Additionally, the coating exhibits optimal hydrophobic performance in terms of contact angle and electrochemical corrosion resistance.