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Specify physical vapor deposition (PVD) coatings like TiAlN or AlCrN (3-5μm thickness) for high-temperature applications above 800°C to prevent oxidation and diffusion wear. For acidic/alkaline environments, demand chemical vapor deposition (CVD) diamond coatings or electroless nickel-plating (50-100μm) with porosity testing (ferroxyl test ≤3 pores/cm²) to guarantee corrosion resistance.
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