Study on Polydopamine‐Densified Waterborne Polyurethane Coatings and Their Corrosion Protection Performance on Al Alloy 3003 DOI Open Access
Bing Lei, Yao Yao,

T. Zhang

et al.

ChemistrySelect, Journal Year: 2025, Volume and Issue: 10(13)

Published: March 30, 2025

Abstract Al alloys are widely used, primarily due to their excellent electrical conductivity, thermal formability, and weldability. However, corrosion issues have limited further development. Organic coatings an important means of protection, yet as environmental awareness grows, waterborne anticorrosion (e.g., polyurethanes) gradually replacing traditional organic coatings. Compared with solvent‐based coatings, however, still face shortcomings in protective performance require modification. This study used polydopamine (PDA) modify a polyurethane (WPU) coating. Samples were immersed 3.5 wt.% NaCl solution, the properties before after modification evaluated by electrochemical impedance spectroscopy (EIS). After 30 days immersion NaCl, maximum |Z| 0.01 Hz PDA‐modified WPU was more than 8.0 × 10 5 Ω∙cm 2 , which is significantly higher 1.0 for unmodified WPU. Various characterization techniques demonstrated that PDA successfully addressed defects coating, improving its overall density. densification effectively slowed diffusion chloride ions other corrosive species, thereby enhancing coating's anti‐corrosion performance. work introduces new strategy enriches protection methods aluminum alloys.

Language: Английский

Study on Polydopamine‐Densified Waterborne Polyurethane Coatings and Their Corrosion Protection Performance on Al Alloy 3003 DOI Open Access
Bing Lei, Yao Yao,

T. Zhang

et al.

ChemistrySelect, Journal Year: 2025, Volume and Issue: 10(13)

Published: March 30, 2025

Abstract Al alloys are widely used, primarily due to their excellent electrical conductivity, thermal formability, and weldability. However, corrosion issues have limited further development. Organic coatings an important means of protection, yet as environmental awareness grows, waterborne anticorrosion (e.g., polyurethanes) gradually replacing traditional organic coatings. Compared with solvent‐based coatings, however, still face shortcomings in protective performance require modification. This study used polydopamine (PDA) modify a polyurethane (WPU) coating. Samples were immersed 3.5 wt.% NaCl solution, the properties before after modification evaluated by electrochemical impedance spectroscopy (EIS). After 30 days immersion NaCl, maximum |Z| 0.01 Hz PDA‐modified WPU was more than 8.0 × 10 5 Ω∙cm 2 , which is significantly higher 1.0 for unmodified WPU. Various characterization techniques demonstrated that PDA successfully addressed defects coating, improving its overall density. densification effectively slowed diffusion chloride ions other corrosive species, thereby enhancing coating's anti‐corrosion performance. work introduces new strategy enriches protection methods aluminum alloys.

Language: Английский

Citations

0