Optimization of molybdenum content in HVOF-sprayed Cr3C2-NiCr coatings for enhanced molten salt corrosion resistance: A dual-effect mechanistic study

2026-06-11

PRE

Xiaoyu Jiao

Junhong Jia *

Runze Wei

Rui Deng

Jie Yang

Nairu He

Yun Shi

Dongsheng Li *

DOI：10.1016/j.corsci.2026.114014

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• Mo-doped Cr3C2-NiCr composite coatings fabricated by HVOF spraying. • 3 wt% Mo yields the highest activation energy and lowest corrosion rate in Na2SO4-NaCl at 700–800 °C. • A dense, adherent Cr2O3-NiCr2O4 scale with trace NiMoO4 (grain-boundary pinning) underpins the improved protection. • Excess Mo generates volatile/low-melting Mo oxides, disrupting scale continuity and degrading corrosion resistance.

Optimization of molybdenum content in HVOF-sprayed Cr3C2-NiCr coatings for enhanced molten salt corrosion resistance: A dual-effect mechanistic study

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