Dacromet Coating Process for Spring Surface Treatment
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Which Surface Treatment Process Provides the Best Corrosion Resistance?
Among various surface treatment methods for springs, Dacromet coating offers the highest level of corrosion resistance.

Principle of Dacromet Coating
Dacromet is a new type of anti-corrosion coating primarily composed of zinc powder, aluminum powder, chromic acid, and deionized water. It is applied through a fully enclosed circulation coating and baking process, forming a thin protective layer on the spring surface. This unique film-forming process results in a coating with special structural and functional properties.

Corrosion Resistance
Dacromet coating provides superior rust protection, exceeding that of traditional electro-galvanization, hot-dip galvanization, or conventional coatings by 7-10 times. Testing has shown that springs treated with Dacromet can withstand salt spray tests for over 1200 hours without developing red rust. This exceptional resistance is due to the overlapping structure of zinc and aluminum flakes, which create a multi-layered barrier that effectively blocks corrosive agents from reaching the spring's base material, significantly delaying corrosion.

Additional Advantages
Apart from its outstanding corrosion resistance, Dacromet coating offers several other benefits:

No Hydrogen Embrittlement: The process does not introduce hydrogen embrittlement, making it suitable for load-bearing components. This is particularly important for springs, which frequently endure stress and can suffer premature failure due to embrittlement in other coating methods.
Strong Adhesion: The coating adheres well to the metal base and provides a solid foundation for additional coatings, making it easier to apply paint or other protective layers.
High Penetrability: It can reach deep holes, narrow gaps, and other complex geometries, ensuring that all parts of the spring are effectively protected—an advantage over traditional electroplating, which struggles with complex shapes.

Die Springs and Industry 4.0

In the era of Industry 4.0, die springs are gradually becoming an integral part of smart manufacturing. No longer just passive components, they can now optimize production processes through data collection and analysis. For example:

•Predictive Maintenance: Sensors collect real-time data to accurately predict a spring’s lifespan and prevent unexpected failures.
•Big Data Optimization: Aggregating data from multiple springs enables analysis to optimize overall equipment performance.

Conclusion: Small Component, Big Future

Die springs may seem simple, but they play a vital role in ensuring the efficient operation of industrial equipment. From traditional load-bearing functions to smart, customized, and eco-friendly innovations, advancements in die spring technology are quietly driving industrial transformation. As technology continues to progress, these small “invisible heroes” are set to shine even brighter on the industrial stage.

Friction Springs: Power Meets Precision

Imagine a spring that doesn’t just store energy but masters it — that’s the magic of friction springs. Designed for the toughest challenges, they combine durability, efficiency, and innovation to deliver performance like no other.

Why Choose Friction Springs?

• Endless Endurance: Built to last millions of cycles under extreme conditions.
• Compact Powerhouse: High energy absorption in a space-saving design.
• Maintenance-Free Performance: Set it and forget it.
• Tailored for You: Customized solutions for every industry and challenge.

Applications That Inspire

From stabilizing industrial machinery to protecting aerospace systems, friction springs redefine reliability across industries.

Elevate your operations with the strength of friction springs. Let’s create something extraordinary — together. Contact us today! Miko.wang@raleigh-spring.com

51CrV4: A cost-effective chromium-vanadium alloy steel offering high tensile strength, fatigue resistance, and moderate corrosion resistance. Commonly used in automotive, industrial machinery, and clamping systems but requires surface treatments in corrosive environments.

17–7PH: Precipitation-hardened stainless steel known for excellent corrosion resistance, high strength, and fatigue resistance. Used in aerospace, defense, and marine applications due to its ability to perform in harsh and high-temperature conditions.

SUS 304: Austenitic stainless steel with outstanding corrosion resistance and good formability. Suitable for food processing, medical applications, and low-load systems where durability in moist or sanitary environments is critical.

Inconel 718: A nickel-chromium super-alloywith exceptional strength, heat, and corrosion resistance. Ideal for extreme environments like aerospace engines, turbines, and oil and gas equipment.

Key Considerations:

- Load Capacity: Inconel 718 and 17–7 PH are suited for high-stress systems, while 51CrV4 and X10CrNi18–8 work in less demanding scenarios.

- Corrosion Resistance: X10CrNi18–8 and Inconel 718 excel in corrosive environments; 51CrV4 is less resistant unless treated.

- Temperature Resistance: Inconel 718 leads for high-temperature applications; 17–7 PH is suitable for moderate temperatures.

- Fatigue Life: Cyclic applications require Inconel 718 or 17–7 PH for durability.

The selection of material depends on the environmental and mechanical demands of the application to ensure performance, longevity, and reliability.

Selection of Disc Springs
Selection is based on the following factors (STAMP methodology):
1. Size: Outer/inner diameter, thickness, and free height.
2. Temperature: Operational temperature ranges (room temperature, 150°C, 300°C, 600°C).
3. Application State: Load characteristics, vibration frequency, and preloading requirements.
4. Medium: Corrosion resistance and environmental factors like pH values.
5. Pressure: Operating pressure fluctuations and thermal expansion/contraction.
Installation Guidelines
1. Minimize the number of stacked springs to reduce frictional losses and deformation. Recommended stack length: L0 ≤ 3De.
2. Apply lubricants (e.g., grease or molybdenum disulfide) between springs to reduce friction.
3. For larger stacks, consider segmental arrangements to improve performance and longevity.
Contact me:Miko.wang@raleigh-spring.com