Salt Spray Testing for Electric Vehicles: Ensuring Durability of Battery Systems and Powertrain Components

The rapid growth of electric vehicles introduces new corrosion challenges. Battery enclosures, high-voltage components, and charging infrastructure must maintain integrity despite exposure to road salts, moisture, and thermal cycling. Salt spray test chambers play a vital role in qualifying these critical systems.

Specific Corrosion Risks in EVs

Battery trays and enclosures are often made from aluminum or coated steel and must resist both external corrosion and potential internal degradation. High-voltage connectors, busbars, and cooling system components are particularly sensitive to corrosion, which can affect electrical performance and safety. Charging stations and connectors also require robust protection against environmental exposure.

Testing Focus Areas

Key components typically evaluated include:

• Battery pack enclosures and structural trays

• High-voltage connectors and cable assemblies

• Electric motor housings and cooling plates

• Power electronics enclosures

• Charging port components and infrastructure

Adapting Testing Protocols for EV Requirements

While traditional ASTM B117 testing remains useful, EV applications often demand longer test durations and more rigorous post-test functional evaluation (insulation resistance, contact resistance, and sealing performance). Cyclic corrosion testing that includes temperature and humidity variations provides better simulation of real-world conditions experienced by vehicles.

Supporting Safe and Reliable Electrification

As the industry moves toward higher energy densities and longer warranties, corrosion testing becomes even more critical. Reliable salt spray and environmental test chambers enable manufacturers to validate designs and materials with confidence, supporting both regulatory compliance and customer expectations for durability.