• 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%.

1. Pre-Cleaning: Remove oils and debris using ultrasonic cleaning (30 kHz, 5–10 minutes) with alkaline detergent (pH 10–11).

2. Surface Preparation: Use 120–400 grit sandpaper for mechanical pre-polishing; or etch with 10% sodium hydroxide (NaOH) for chemical processes.

3. Polishing: Select technique based on part geometry (see Table 1).

4. Post-Treatment:

• Rinse thoroughly with deionized water (18 MΩ·cm).

• Passivate with chromic acid (5–10% solution) to prevent oxidation.

5. Quality Inspection: Use a profilometer (e.g., Mitutoyo SJ-210) to verify Ra values; perform salt spray testing (ASTM B117) for corrosion resistance.

Our Company

Zhongshan Shanfeng CNC Welding Aluminum Products Co., Ltd

We offer a vast array of products and solutions for customers that value quality and efficiency, in Aluminum CNC machining and components. We supply markets in United States, Canada, Austrial, and other countries.

We were founded in 2005 and located to Room 10, No. 147-3, Tanbei West Second Road, Lisheng Community, Xiaolan Town, Zhongshan City Guangdong Province. By offering a variety of metal finishing services, we are able to be a one-stop shop for our customers. While our main industries we provide processing for consist of aerospace, military, medical; we also work with commercial industries that require a high end cosmetic finish on all their products. Precision Metal Processing has the fastest turn around delivery while still maintaining incredible quality and competitive pricing.

At our company (Zhongshan Shanfeng), customer satisfaction comes first. We are fully dedicated to bringing wholesome aluminum metal solutions in wallet-friendly packages to each of our customers; and we do so without compromise to safety, quality, or performance.