ECA Subsurface Corrosion Detection

Evident Industrial Resources

Application Notes

Aircraft around the globe are repeatedly subjected to drastic temperature changes, which cause condensation and humidity to collect on the inside of the aluminum skin. This humid environment between layers leads to hidden corrosion that must be detected and repaired during regular in-service inspections.

As a part of its series of aerospace solutions, Evident proposes an innovative fastener and subsurface corrosion inspection technique, which propels eddy current technology into previously uncharted territory. This new technology detects, sizes, and evaluates the depth of corrosion between the aluminum layers of commercial and military aircraft, providing efficient and reliable results.

Internal Subsurface Corrosion Area

Area and Depth Color Calibration

In this particular example, corrosion detection gives these values:

PINK= 40% corrosion depth

RED= 30% corrosion depth

YELLOW= 20% corrosion depth

BLUE= 10% corrosion depth

OmniScan MX ECA/ECT

Performs eddy current array testing inspections. The test configuration supports 32 sensor coils (up to 64 with an external multiplexer) working in bridge or transmit-receive mode. The operating frequency ranges from 20 Hz to 6 MHz with the option of using multiple frequencies in the same acquisition.