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Ni60CuMo similar metco 16C, High hardness nickel-based alloy with better corrosion resistance
Nickel-Based Self-Fluxing Alloy
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Ni60CuMo similar metco 16C, High hardness nickel-based alloy with better corrosion resistance

Material Properties and Microscopic Mechanisms

· Corrosion Resistance:

· Sulfate Passivation: Added Cu (3%) promotes the formation of dense oxide films (e.g., CuO/Cu₂O) in low-concentration sulfuric acid (H₂SO₄), enhancing corrosion resistance.

· Chloride Resistance: Mo (3%) forms stable MoOCl₄²⁻ complexes with Cl⁻ ions, preventing chloride penetration and mitigating pitting/sress corrosion cracking (SCC).

· High-Temperature Oxidation: Mo forms a continuous (Ni,Mo)O phase with a melting point up to 1600°C, maintaining oxide film stability at 300–500°C.

· Sulfur Resistance and Lubricity:

· Mo-S Interactions: In sulfur-containing environments, Mo reacts with S to form molybdenum disulfide (MoS₂), a lamellar structure that reduces friction coefficients (0.05–0.1) and acts as a solid lubricant.

· Dynamic Load Endurance: MoS₂ softens under frictional heat, forming a transfer film that extends service life in dynamic friction applications.

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    Processing Technology Adaptability

    · Flame Welding:
    · Oxyacetylene Flame: Low cost, suitable for thick coatings (>1 mm), but prone to oxide inclusions.
    · Plasma Spray: Electric arc temperature 12,000–15,000°C, 85% powder utilization rate, high coating density for precision parts.
    · Laser Cladding Limitations:
    · Thermal Stress Issues: Ni60CuMo’s thermal expansion coefficient (13.8 μm/m·K) mismatch with substrates increases cracking risk.
    · Solutions: Gradient multi-layer cladding (0.1–0.2 mm per layer), substrate preheating to 150°C, or adding TiB₂ (0.5–1%) as crack inhibitor.

    Typical Application Cases

    · Offshore Platform Equipment:
    · Christmas Tree Valves: In mud environments with Cl⁻ ≤5000 ppm and pH 3–5, service life triples compared to stainless steel.
    · Subsea Pipe Fittings: MoS₂ lubrication reduces friction torque under deep-sea pressure, minimizing maintenance.
    · Chemical Storage Tanks:
    · In sulfuric acid storage tanks (≤10% concentration), combined with sacrificial anodes, achieves >10 years of maintenance-free operation.
    Spray welding treatment on the surface of the ball valve (1)

    Typical Application Cases

    · Offshore Platform Equipment:
    · Christmas Tree Valves: In mud environments with Cl⁻ ≤5000 ppm and pH 3–5, service life triples compared to stainless steel.
    · Subsea Pipe Fittings: MoS₂ lubrication reduces friction torque under deep-sea pressure, minimizing maintenance.
    · Chemical Storage Tanks:
    · In sulfuric acid storage tanks (≤10% concentration), combined with sacrificial anodes, achieves >10 years of maintenance-free operation.

    Spray welding treatment on the surface of the ball valve (2)

    Future Research Directions

    · Nanomaterial Reinforcement: Add 0.1–0.3% SiC nanoparticles to enhance hardness and wear resistance.
    · Eco-Friendly Coatings: Develop low-temperature plasma spraying to reduce VOC emissions.
    · Digital Simulation: Use CALPHAD to optimize composition design and predict failure modes under various working condition.
    (Note: Data based on ASTM standards and published literature; field validation required for specific applications.)
    This translation maintains technical accuracy while ensuring readability for international audiences. Let me know if further refinements are needed!

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