期刊
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
卷 61, 期 19, 页码 6481-6493出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.iecr.2c00504
关键词
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资金
- University Grants Commission, Government of India
- UGC, Government of India [F.4-2/2006 (BSR) /CH/18-19/0232]
A near-infrared reflective composite pigment was synthesized and successfully applied to a conversion coating on a hot-dip zinc-coated steel sheet. The coating exhibited a compact structure, high crystalline coverage, excellent corrosion resistance, good NIR solar reflectance, and thermal stability.
A near-infrared (NIR) reflective BiVO4-TiO2 composite pigment was synthesized using a combined precipitation-sol-gel process and successfully assimilated to a zinc phosphate conversion coating on a hot-dip zinc-coated steel sheet. The combination of BiVO4 with TiO2 resulted in reducing crystallite size and band gap, which improved the NIR reflectance. The BiVO4-TiO2 composite-based zinc phosphate coating presented a compact hierarchical structure with a high degree of crystalline coverage. The coating with enhanced yellow coloration exhibited good NIR solar reflectance (80.72%) with long-term NIR reflectivity and thermal durability. The composite-based zinc phosphate coating presented excellent corrosion resistance to the hot-dip coated mild steel with high charge transfer resistance (90.86 k Omega cm2) and low corrosion current density (0.33 mu A/cm2). The coating presented high durability during aggressive salt spray exposure and bend tests. The present coating formulation has a high potential for energy-saving applications in automobiles and buildings to reduce heat buildup.
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