Sustaining Conversion Treatment For Automotive Applications

Abstract

This study consolidates two complementary research streams focused on boosting the efficiency, robustness, and sustainability of automotive surface treatments. The first stream examines triazole derivatives as performance accelerators in low-temperature zinc phosphating of microalloyed steel S420MC, targeting improved reaction kinetics, coating uniformity, and corrosion protection under energy-reduced operating conditions. The second stream evaluates an optimized electrophosphating route designed to deliver denser, more adherent conversion layers with enhanced stability for cataphoresis and downstream paint applications. Across both efforts, we synthesized tailored additives, benchmarked their behavior, and assessed coating evolution through electrochemical diagnostics, morphological mapping, and adhesion testing. Joint findings confirm that triazole-based accelerators refine phosphate crystal development, while electrophosphating provides controlled layer growth and superior interfacial integrity. When integrated, these two approaches deliver higher coating durability, improved primer compatibility, and stronger resistance to aggressive corrosion cycles compared with standard formulations. The combined workflow offers an industrially scalable pathway that addresses energy constraints, strengthens material performance, and reduces environmental impact across automotive manufacturing. The outcomes support strategic deployment of advanced chemical modifiers and controlled deposition technologies to future-proof coating lines and enable next-generation eco-efficient metal finishing solutions for high-strength steels in global operations.