Neutral pH Aluminum Polishing Liquid for Metal Surfaces

• Abrasive Selection: Silicon carbide (SiC) grits (80-2000) for initial grinding; aluminum oxide (Al₂O₃) or diamond pastes (1-0.1 μm) for final finishing.
• Key Parameter: Buffing wheel speed (1500-3000 RPM) to avoid overheating, which can cause discoloration.
• Advantage: Suitable for flat or slightly curved surfaces; minimal waste generation.

• Solution Composition: 60-70% phosphoric acid, 10-20% nitric acid, 5-10% sulfuric acid (by volume).
• Process Conditions: Temperature 80-120°C; immersion time 3-10 minutes.
• Precision Note: Achieves uniform results but may reduce dimensional accuracy by 0.01-0.05 mm.

• Electrolyte: Sulfuric acid (20-30%) + phosphoric acid (60-70%) solution.
• Operating Parameters: Voltage 10-20 V; current density 10-50 A/dm²; temperature 40-60°C.
• Benefit: Enhances corrosion resistance by forming a 2-5 μm thick oxide layer; meets ASTM B912 standards for aerospace use.

• Laser Settings: Power 50-200 W; scanning speed 500-2000 mm/s; spot size 50-100 μm.
• Surface Result: Achieves Ra values as low as 0.005 μm, suitable for optical components.
• Limitation: High equipment cost ($100,000+), making it viable only for high-value parts.

• Aerospace: Electropolished aluminum alloys (e.g., 7075-T6) for aircraft frames, requiring Ra < 0.05 μm to reduce drag.
• Automotive: Mechanical polishing for aluminum wheels (Ra 0.08-0.1 μm) and chemical polishing for engine components.
• Medical Devices: Laser-polished 6061 aluminum surgical tools, meeting ISO 13485 standards for biocompatibility.
• Electronics: Chemical polishing for heat sinks (e.g., 6063 aluminum) to improve thermal conductivity by 10-15%.

Aluminum parts polishing is a blend of art and science, requiring careful selection of techniques based on part design, material, and performance needs. Whether using cost-effective mechanical methods or precision laser polishing, adherence to process parameters and quality standards ensures optimal results. For industrial applications, partnering with ISO 9001-certified polishing services guarantees compliance with sector-specific requirements, from aerospace to medical devices.

For custom polishing solutions or technical support, contact our team of metallurgical engineers with 20+ years of expertise in aluminum finishing.