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Zn-Ni XYLAN 1014 Stud Bolt
QS Fastener: Zn-Ni XYLAN 1014 Stud Bolt
Name: Zn-Ni XYLAN 1014 Stud Bolt
Primer Coating: Zn-Ni
Top Coating: XYLAN 1014 Blue
Material: ASTM A193 B7
Length: 180mm
Size: 1-1/2 Inch
Parts: With Two Heavy Hex Nuts
Material for Nut: ASTM A194 2H
Standard: ASME B18.31.2
Primer Coating: Zn-Ni
Top Coating: XYLAN 1014 Blue
Material: ASTM A193 B7
Length: 180mm
Size: 1-1/2 Inch
Parts: With Two Heavy Hex Nuts
Material for Nut: ASTM A194 2H
Standard: ASME B18.31.2
Quantity
Zn-Ni XYLAN 1014 Stud Bolt is manufactured from high-strength alloy steel and paired with heavy hex nuts, specifically designed for heavy-duty applications in petrochemical and energy industries. Standard specifications include 1 1/2-inch diameter and 180mm length, featuring a zinc-nickel base layer (12-15% Ni, 1200-hour salt spray protection) combined with XYLAN 1014 blue polyurethane coating (chemical-resistant, high-temperature resistant, self-lubricating) for superior corrosion protection and ease of assembly. Zn-Ni XYLAN 1014 Stud Bolt serves as a high-performance upgrade over traditional zinc-plated bolts, ideal for demanding industrial environments.
Zn-Ni XYLAN 1014 Stud Bolt – Zinc-Nickel Base Layer (Zn-Ni, 12-15% Ni) Characteristics
1. Composition & Structural Properties
The zinc-nickel (Zn-Ni) base layer of Zn-Ni XYLAN 1014 Stud Bolt is a high-performance anti-corrosion coating widely used in critical sectors such as automotive, aerospace, and marine engineering. Its core advantage lies in precise nickel content control and the formation of a γ-phase (ZnNi) single-phase structure.
1. Composition & Structural Properties
The zinc-nickel (Zn-Ni) base layer of Zn-Ni XYLAN 1014 Stud Bolt is a high-performance anti-corrosion coating widely used in critical sectors such as automotive, aerospace, and marine engineering. Its core advantage lies in precise nickel content control and the formation of a γ-phase (ZnNi) single-phase structure.
1.1 Optimized Nickel Content (12-15%)
The performance of Zn-Ni XYLAN 1014 Stud Bolt's zinc-nickel alloy heavily depends on the precise nickel ratio. Research shows that a nickel content of 12-15% enables the formation of a γ-phase (ZnNi) structure, which delivers optimal corrosion resistance, mechanical properties, and electrochemical protection.
The performance of Zn-Ni XYLAN 1014 Stud Bolt's zinc-nickel alloy heavily depends on the precise nickel ratio. Research shows that a nickel content of 12-15% enables the formation of a γ-phase (ZnNi) structure, which delivers optimal corrosion resistance, mechanical properties, and electrochemical protection.
Benefits of 12-15% Ni Optimization:
- Forms a dense γ-phase monolayer with low porosity (<1%), significantly enhancing salt spray resistance (1000+ hours without red rust).
- Moderate hardness (300-350 HV) balances wear resistance and avoids brittle fracture, making it suitable for high-precision fasteners (e.g., ISO 898-1 Grade 10.9 bolts).
- Forms a dense γ-phase monolayer with low porosity (<1%), significantly enhancing salt spray resistance (1000+ hours without red rust).
- Moderate hardness (300-350 HV) balances wear resistance and avoids brittle fracture, making it suitable for high-precision fasteners (e.g., ISO 898-1 Grade 10.9 bolts).
1.2 Base Layer Thickness (8-12μm) & Salt Spray Performance Correlation
The corrosion resistance of Zn-Ni XYLAN 1014 Stud Bolt is closely linked to its Zn-Ni coating thickness. Per ISO 4042 (Class 8) standards, a recommended thickness of 8-12μm ensures long-term protection.
The corrosion resistance of Zn-Ni XYLAN 1014 Stud Bolt is closely linked to its Zn-Ni coating thickness. Per ISO 4042 (Class 8) standards, a recommended thickness of 8-12μm ensures long-term protection.
- Effect of Thickness on Corrosion Resistance:
- 6μm: Neutral salt spray (NSS) shows red rust at ~600 hours.
- 8-10μm: No red rust for 1000 hours (meets automotive industry standards).
- 12μm: Exceeds 1500 hours in harsh environments (e.g., marine atmosphere).
- >15μm may cause threading interference (e.g., M12 bolt tolerance issues).
- 6μm: Neutral salt spray (NSS) shows red rust at ~600 hours.
- 8-10μm: No red rust for 1000 hours (meets automotive industry standards).
- 12μm: Exceeds 1500 hours in harsh environments (e.g., marine atmosphere).
- >15μm may cause threading interference (e.g., M12 bolt tolerance issues).
- Uniform Coating Control:
- Zn-Ni XYLAN 1014 Stud Bolt employs pulse plating technology (forward current density: 3 A/dm², reverse current ratio: 20%) to avoid edge effects seen in traditional DC plating, ensuring uniform coverage on thread roots and flanks.
- Optimized additives (e.g., brighteners, levelers) reduce internal stress, improving adhesion and fatigue resistance.
- Zn-Ni XYLAN 1014 Stud Bolt employs pulse plating technology (forward current density: 3 A/dm², reverse current ratio: 20%) to avoid edge effects seen in traditional DC plating, ensuring uniform coverage on thread roots and flanks.
- Optimized additives (e.g., brighteners, levelers) reduce internal stress, improving adhesion and fatigue resistance.
2. Performance Advantages
2.1 Electrochemical Protection Mechanism
Zn-Ni XYLAN 1014 Stud Bolt achieves corrosion resistance through a dual-protection system: sacrificial anode + passive film.
2.1 Electrochemical Protection Mechanism
Zn-Ni XYLAN 1014 Stud Bolt achieves corrosion resistance through a dual-protection system: sacrificial anode + passive film.
- Sacrificial Anode Effect:
- Zn-Ni’s corrosion potential (-0.8 to -1.0V vs. SCE) is more negative than steel (-0.6V), ensuring preferential corrosion at coating defects to protect the substrate (reaction: Zn → Zn²⁺ + 2e⁻).
- Zn-Ni’s corrosion potential (-0.8 to -1.0V vs. SCE) is more negative than steel (-0.6V), ensuring preferential corrosion at coating defects to protect the substrate (reaction: Zn → Zn²⁺ + 2e⁻).
- Tests confirm a 95% current efficiency for 12% Ni coating, far exceeding pure zinc (~60%), guaranteeing long-term electrochemical protection.
- Passive Film Protection:
- Initial corrosion forms a dense ZnO/Zn(OH)₂/NiO mixed passive film, slowing further degradation.
- In Cl⁻-rich environments (e.g., salt spray), the γ-phase structure resists pitting 60% longer than pure zinc.
- Initial corrosion forms a dense ZnO/Zn(OH)₂/NiO mixed passive film, slowing further degradation.
- In Cl⁻-rich environments (e.g., salt spray), the γ-phase structure resists pitting 60% longer than pure zinc.
2.2 High-Temperature Resistance (Short-Term 250℃ Tolerance)
While traditional zinc coatings degrade rapidly above 120℃, Zn-Ni XYLAN 1014 Stud Bolt’s γ-phase stability allows short-term exposure to 250℃ (e.g., engine bay environments).
While traditional zinc coatings degrade rapidly above 120℃, Zn-Ni XYLAN 1014 Stud Bolt’s γ-phase stability allows short-term exposure to 250℃ (e.g., engine bay environments).
- Case Studies:
- Automotive turbocharger bolts (200-230℃) with Zn-Ni XYLAN 1014 Stud Bolt tripled salt spray life (from 300 to 1000 hours).
- Aerospace fasteners (e.g., Al alloy rivets) maintain low contact resistance (<0.1Ω) under high-temperature, high-humidity conditions.
- Automotive turbocharger bolts (200-230℃) with Zn-Ni XYLAN 1014 Stud Bolt tripled salt spray life (from 300 to 1000 hours).
- Aerospace fasteners (e.g., Al alloy rivets) maintain low contact resistance (<0.1Ω) under high-temperature, high-humidity conditions.
3. Conclusion
By combining a 12-15% Ni Zn-Ni base layer, optimized 8-12μm thickness, and dual-protection mechanisms, Zn-Ni XYLAN 1014 Stud Bolt delivers:
- Exceptional salt spray resistance (1000 hours without red rust).
- Outstanding high-temperature stability (short-term 250℃ tolerance).
- Reliable mechanical compatibility (300-350 HV hardness, stable torque coefficient).
By combining a 12-15% Ni Zn-Ni base layer, optimized 8-12μm thickness, and dual-protection mechanisms, Zn-Ni XYLAN 1014 Stud Bolt delivers:
- Exceptional salt spray resistance (1000 hours without red rust).
- Outstanding high-temperature stability (short-term 250℃ tolerance).
- Reliable mechanical compatibility (300-350 HV hardness, stable torque coefficient).
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