In alkaline environments, WS₂ performs excellently at room temperature, resisting dilute NaOH or KOH (e.g., 1 M) with no reaction or mass loss over months. Its inertness stems from stable W-S bonds, unaffected by OH⁻ ions. Tests confirm no dissolution or degradation in pH 10-14 solutions.
Molten alkalis (e.g., NaOH at 500°C) decompose WS₂ into Na₂WO₄ and Na₂S, a reaction requiring heat and oxygen, not typical ambient use. Compared to MoS₂, WS₂’s stability is similar, both resisting cold bases. In applications like alkaline lubricants or coatings, WS₂ excels unless exposed to extreme heat, where protective measures are needed.
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