Advances in Hexavalent Chromium Free Slurry Coatings for Corrosion Resistance Applications

Slurry coatings are liquid phase-applied systems that cure to form composite ceramic‑metallic layers with superior thermal stability and chemical resistance compared to traditional resin‑based coatings. Their formulations enable targeted performance properties—including aqueous corrosion protection, molten‑salt hot‑corrosion resistance, and controlled surface finish for air‑path components in turbomachinery and related high‑temperature environments. Recent development efforts have focused on redesigning these coatings to eliminate hazardous hexavalent‑chromium chemistries, replacing them with safer and more environmentally sustainable alternatives while maintaining or improving performance. This presentation will review current advancements in slurry‑coating technology, highlight application‑specific performance attributes, and discuss ongoing work toward next‑generation, environmentally responsible protective coating systems.