Abstract
A new design for an experimental set-up is proposed for monitoring the contact angle, droplet height, base diameter, corrosion rate and volume loss under a single droplet of NaCl placed gently on carbon steel surface. The monitoring results indicated that the contact angle and droplet height decreased while the volume losses and the corrosion rate increased as holding time progressed. The droplet diameter remains practically constant over a holding lifetime of the drop. A mechanism describing the successive stages of a corrosion process under a single droplet of NaCl is proposed.