In acidic environments, WS₂ performs well under mild conditions but falters with strong oxidants. In dilute acids (e.g., 1 M HCl, H₂SO₄), it’s inert, showing no dissolution or mass loss over weeks due to its covalent structure. Tests (e.g., ICP-MS) detect no W or S ions, suiting it for acidic industrial settings (e.g., pump coatings).
Strong acids like concentrated HNO₃ or aqua regia react slowly, forming WO₃ and H₂S, with reaction rates rising with concentration and temperature (e.g., faster at 50°C). This degradation is minimal in dilute conditions (<0.01% loss/day), unlike metals (e.g., iron dissolves rapidly in HCl). Compared to MoS₂, WS₂ is slightly more resistant, but both withstand non-oxidizing acids well.
Performance depends on acid strength and exposure time—prolonged contact with oxidants limits use, but mild acidity poses no issue, supporting WS₂’s role in stable, low-corrosion applications.
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