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.

Die Springs: The Unsung Heroes of Precision Manufacturing
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In recent years, the demand for high-precision and high-durability die springs has been on the rise as global manufacturing continues to evolve. As a crucial component in industrial mold systems, die springs play a vital role in automotive, aerospace, electronics, and plastic molding industries due to their high strength, fatigue resistance, and exceptional stability.

Technical Advantages of die Springs
Die springs are typically made from high-quality alloy steels such as chrome-silicon or chrome-vanadium steel, undergoing rigorous heat treatment and surface processing to ensure superior elasticity and durability. Compared to traditional compression springs, die springs can withstand higher loads and provide more stable rebound forces. Their compact design also helps save mold space, improving overall production efficiency.

Inconel 718
Composition Analysis
Inconel 718 is a nickel-based precipitation-strengthened alloy, with carefully balanced chemical elements that contribute to its excellent properties.

Nickel (Ni) content is about 53%, serving as the primary component to provide good corrosion resistance and high-temperature stability.
Chromium (Cr) content is about 19%, enhancing oxidation and corrosion resistance.
Iron (Fe) content is about 18%, maintaining structural stability while affecting the alloy's mechanical properties.
Niobium (Nb) content is about 5%, which forms the γ'' phase (Ni₃Nb) and γ' phase (Ni₃(Al,Ti)), playing a crucial role in precipitation strengthening.
Molybdenum (Mo) content is about 3%, improving strength and corrosion resistance in complex environments.
Titanium (Ti) content is about 0.9%, and Aluminum (Al) content is about 0.5%. These elements help form the strengthening phase and improve overall mechanical performance.