The contrast sensitivity of neutron radiographic detection of corrosion products in aluminium is nearly one order of magnitude better than with soft (30 kV) X-ray radiography. With neutron radiography quantitative measurements of the depth of surface corrosion of aluminium objects can be effectively performed. Experimentally it has been confirmed that through I cm thick Al slab approximately 0.1–0.2 mm thick layer of corrosion products can easily be detected. Neutron radiography can thus be a valuable nondestructive method for the detection and quantitative evaluation of corrosion on aluminium structures. Aluminium honeycomb structures can thus be simultaneously inspected for corrosion nests, moisture and defects in adhesive layer.