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Thermal and corrosion performance of low-melting-point nitrate/nitrite molten-salt phase change materials via synergistic substitution of LiNO3 with NaNO2-ca(NO3)2.

Number: 0039

Author(s) : WANG S., YANG X., LI Z., ZHANG X., ZHENG Y., ZHU Z., JIN H., SUN Y., LIU B.

Summary

To reduce reliance on costly LiNO₃-based melting-point reduction and mitigate freezing risks in thermal
energy storage systems, this study developed Li-free nitrate/nitrite molten-salt phase change materials using a
synergistic NaNO₂–Ca(NO₃)₂ strategy. Eight formulations were prepared by static fusion and evaluated for
phase-change behavior, thermal stability, heat storage capacity, and compatibility with 316L stainless steel.
The optimal composition, 15 wt.% Ca(NO₃)₂–50 wt.% KNO₃–5 wt.% NaNO₃–30 wt.% NaNO₂, exhibited a
principal melting endset temperature of 102.3 ℃, a melting enthalpy of 265.7 J·g⁻¹, a T₃% value of 637 ℃, an
average specific heat capacity of 1.824 kJ·kg⁻¹·K⁻¹, a volumetric storage density of 1.985 × 10⁹ J·m⁻³, and an
apparent corrosion rate of 0.0055 mm·year⁻¹. These results demonstrate that NaNO₂–Ca(NO₃)₂ synergy
provides an effective route for developing low-cost, low-melting molten-salt PCMs.

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  • Original title: Thermal and corrosion performance of low-melting-point nitrate/nitrite molten-salt phase change materials via synergistic substitution of LiNO3 with NaNO2-ca(NO3)2.
  • Record ID : 30035386
  • Languages: English
  • Subject: Technology
  • Source: 15th IIR Conference on Phase-Change Materials and Slurries for Refrigeration and Air Conditioning. Proceedings:  Xi'an China, September 16-18, 2026.
  • Publication date: 2026/09
  • DOI: http://dx.doi.org/10.18462/iir.pcm.2026.0039

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