WS₂ exhibits excellent corrosion resistance in neutral or mildly acidic environments due to its chemical inertness. It resists water, alcohols, dilute acids (e.g., HCl), and most organics at room temperature, with no detectable corrosion (mass loss <0.001% over months). This stems from strong W-S bonds and a lack of reactive sites, unlike metals prone to rust or galvanic attack.
In air, WS₂ is stable to 510°C; below this, humidity or salt spray (e.g., ASTM B117) causes no corrosion, outperforming steel or copper. Strong oxidants (e.g., HNO₃, aqua regia) degrade it slowly, forming WO₃, but this is chemical attack, not typical corrosion. Molten alkalis (e.g., NaOH at 500°C) decompose it, marking a limit. Compared to MoS₂, WS₂’s higher oxidation threshold enhances durability.
Applications like coatings or bearings leverage this resistance in humid or mildly acidic settings, though extreme conditions require protection. Corrosion tests (e.g., immersion, electrochemical) confirm its robustness where passivation isn’t needed.
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