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Surface Finishing for New-Energy & Automotive Parts: Corrosion Resistance, Wear Resistance & Appearance Control

Created on 05.21

Meta Description: Professional surface finishing solutions for new-energy and automotive parts, focusing on corrosion resistance, wear resistance and appearance quality control to meet industry standards. #new-energy part surface finishing #automotive part coating #corrosion resistance surface treatment #automotive interior finishing

New-energy (battery components, charging piles) and automotive parts (interior/exterior, powertrain components) operate in harsh environments—high temperature, humidity, friction, and chemical corrosion—placing strict requirements on surface finishing. Surface finishing not only ensures the appearance consistency of parts but also enhances corrosion resistance, wear resistance, and service life, which is critical for product safety and compliance (automotive industry standards: ISO 12944, ASTM B117). Based on industrial OEM experience in new-energy and automotive fields, we share targeted surface finishing solutions and quality control methods.

1. Surface Finishing Requirements for New-Energy Parts

New-energy parts (battery casings, busbars, charging pile components) focus on corrosion resistance, electrical conductivity, and insulation performance, with strict environmental protection requirements (RoHS, REACH compliant).

• Battery Casings (Aluminum Alloy/Stainless Steel): Anodizing (aluminum alloy) or passivation (stainless steel) + waterproof coating; requirements: salt spray corrosion resistance ≥1000h, no corrosion, no rust.

• Busbars (Copper Alloy/Aluminum Alloy): Electroplating (tin, silver) or passivation; requirements: good electrical conductivity, corrosion resistance ≥48h salt spray test, no oxidation.

• Charging Pile Components (Stainless Steel/Plastic): Sandblasting + anti-corrosion coating (plastic parts: spray painting; metal parts: PVD coating); requirements: weather resistance, UV resistance, corrosion resistance in outdoor environment.

2. Surface Finishing Requirements for Automotive Parts

Automotive parts are divided into interior and exterior parts, with different finishing focuses: interior parts focus on appearance, tactile feel and environmental protection; exterior parts focus on corrosion resistance, wear resistance and weather resistance.

Automotive Exterior Parts (Bumpers, Door Handles, Wheels)

• Metal exterior parts (wheels, door handles): PVD coating or electroplating + clear coat; requirements: wear resistance (≥5000 cycles friction test), corrosion resistance ≥1000h salt spray, UV resistance (no yellowing for 2000h).

• Plastic exterior parts (bumpers): Sandblasting + anti-stone impact coating + spray painting; requirements: impact resistance, weather resistance, color difference ΔE ≤1.5.

Automotive Interior Parts (Dashboard, Door Panels, Handles)

• Plastic interior parts (dashboard, door panels): Texture spraying or soft-touch painting; requirements: environmental protection (VOC ≤50g/L), soft tactile feel, scratch resistance.

• Metal interior parts (air vents, handles): Anodizing or sandblasting; requirements: matte surface, no sharp edges, corrosion resistance ≥240h salt spray.

3. Key Quality Control Points for Surface Finishing

• Pre-treatment: Degrease, derust, and activate parts to ensure coating adhesion; avoid bubbles and peeling caused by oil stains and oxide layers.

• Process Parameter Control: Strictly control coating thickness, temperature, and time; for example, anodizing temperature of automotive aluminum parts should be 18-22℃ to ensure uniform film thickness.

• Testing Standards: Conduct salt spray test (corrosion resistance), friction test (wear resistance), cross-cut test (adhesion), and color difference test (appearance) to meet automotive/new-energy industry standards.

• Environmental Protection: Use environmentally friendly coatings and chemical agents (chromate-free passivation, low-VOC paint) to comply with RoHS and REACH standards.

We provide customized surface finishing solutions for new-energy and automotive parts, strictly complying with industry standards, ensuring part performance and appearance quality, and supporting batch stable production.