Melmag 75 Magnesium Alloy ,E FOUR

### **Melmag 75 Magnesium Alloy** **Product Overview** Melmag 75 is a high-purity magnesium alloy specifically formulated for applications requiring exceptional corrosion resistance and excellent mechanical properties. As a premium-grade magnesium-aluminum-manganese alloy, it offers superior performance in harsh environmental conditions while maintaining the excellent strength-to-weight ratio characteristic of magnesium alloys. The alloy is particularly designed for automotive, aerospace, and industrial applications where reliability in corrosive environments is paramount. This alloy is suitable for both die casting and sand casting processes, offering manufacturers flexibility in component production while ensuring consistent performance across different manufacturing methods. --- #### **1. Chemical Composition** Melmag 75 features a carefully balanced composition with stringent control over impurity elements. | Element | Composition (% by Weight) | | :---------------- | :-------------------------------- | | **Aluminum (Al)** | 6.5 - 7.5 % | | **Manganese (Mn)** | 0.15 - 0.35 % | | **Zinc (Zn)** | ≤ 0.08 % | | **Silicon (Si)** | ≤ 0.08 % | | **Copper (Cu)** | ≤ 0.008 % | | **Iron (Fe)** | ≤ 0.003 % | | **Nickel (Ni)** | ≤ 0.001 % | | **Other Impurities** | ≤ 0.01 % (each) | | **Magnesium (Mg)** | Balance | *Note:* The optimized **aluminum** content provides an excellent balance of strength and ductility, while the ultra-low levels of **iron**, **copper**, and **nickel** ensure exceptional corrosion resistance. **Manganese** serves to neutralize residual iron impurities, further enhancing the alloy's corrosion performance. --- #### **2. Physical & Mechanical Properties** Melmag 75 exhibits outstanding mechanical properties with superior corrosion resistance. **Physical Properties:** * **Density:** 1.79 g/cm³ (0.065 lb/in³) * **Melting Range:** 550 - 615 °C (1022 - 1139 °F) * **Coefficient of Thermal Expansion:** 26.1 μm/m·°C (20-200°C) * **Thermal Conductivity:** 68 W/m·K * **Specific Heat Capacity:** 1040 J/kg·K **Typical Mechanical Properties (As-Die Cast):** * **Ultimate Tensile Strength (UTS):** 220 - 240 MPa (32 - 35 ksi) * **Tensile Yield Strength (TYS):** 130 - 150 MPa (19 - 22 ksi) * **Elongation:** 6 - 10% * **Compressive Yield Strength:** 130 - 150 MPa (19 - 22 ksi) * **Shear Strength:** 135 - 155 MPa (20 - 22 ksi) * **Fatigue Strength:** 110 - 130 MPa (16 - 19 ksi) * **Hardness:** 65 - 75 HBW * **Modulus of Elasticity:** 45 GPa (6.5 × 10³ ksi) **Corrosion Performance:** * **Exceptional salt spray resistance** (> 600 hours to first corrosion) * **Superior general corrosion resistance** in various environments * **Excellent galvanic corrosion performance** with proper design * **Good stress corrosion cracking resistance** * **Maintains integrity in humid and marine environments** --- #### **3. International Standards & Specifications** Melmag 75 complies with major international standards for magnesium alloys. * **ASTM International:** **ASTM B94** (Standard Specification for Magnesium-Alloy Die Castings) * **ISO Standards:** **ISO 16220** (Magnesium and magnesium alloys - Castings) * **SAE International:** **SAE J465** * **JIS Standards:** **JIS H 5303** * **GB Standards:** **GB/T 19078** * **EN Standards:** **EN 1753** * **Proprietary Designation:** **Melmag 75** --- #### **4. Product Applications** Melmag 75 is widely used in demanding applications where corrosion resistance is critical. * **Automotive Industry:** * **Transmission Housings and Components** * **Engine Mounting Brackets** * **Steering Column Components** * **Electronic Control Unit Housings** * **Battery Enclosure Components for EVs** * **Aerospace & Defense:** * **Aircraft Instrument Housings** * **Avionics Equipment Casings** * **Communication System Enclosures** * **Military Equipment Components** * **Electronics & Telecommunications:** * **Server Rack Components** * **Network Equipment Housings** * **Outdoor Communication Devices** * **Portable Electronic Device Frames** * **Industrial & Consumer Applications:** * **Power Tool Housings** * **Outdoor Equipment Components** * **Marine and Coastal Equipment** * **Medical Device Enclosures** --- #### **5. Manufacturing Characteristics** **Casting Performance:** * Excellent fluidity for thin-walled castings (1.0-2.0 mm) * Good hot tearing resistance * Low solidification shrinkage * Excellent dimensional stability * Consistent mechanical properties **Secondary Processing:** * Excellent machinability with superior surface finish * Good weldability using standard techniques * Excellent paint adhesion characteristics * Responsive to various surface treatments * Compatible with common coating systems --- **Summary** **Melmag 75 Magnesium Alloy** represents a premium-grade magnesium alloy that sets new standards for corrosion resistance in magnesium casting applications. The alloy's sophisticated chemistry, characterized by **precisely controlled aluminum content** and **ultra-low impurity levels**, delivers exceptional performance in corrosive environments while maintaining excellent mechanical properties. Compliance with international standards including **ASTM B94** and **ISO 16220** ensures consistent quality and reliability across production batches. Melmag 75's balanced combination of strength, ductility, and superior corrosion resistance makes it an ideal choice for automotive, aerospace, and industrial applications where components must withstand harsh environmental conditions while providing weight reduction benefits. The alloy continues to enable new applications for magnesium in challenging service environments, offering engineers and designers a reliable, high-performance material solution that combines the inherent advantages of magnesium with enhanced durability and corrosion performance.

Packing of Standard Packing: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 3426 gallon liquid totes Special package is available on request.