A Laboratory Approach to the Mechanism of Attack on the Wire-on-Bolt Device Used for Atmospheric Corrosion Studies

While searching for the elucidation of the role of galvanic and crevice effects on the corrosion process of wire-on-bolt specimens used for atmospheric corrosion assessments, an experimental procedure was carried out. This experiment included the exposure of samples to a CEBELCOR chamber, followed by mass-loss measurements and electrochemical and morphological characterization. Results showed that the influence of the crevice can be as important as the galvanic effect, mainly in the Al-Fe system, and that the morphology of the corrosion products and the aeration conditions within the crevice strongly influence the whole process.