Abstract
An experimental method has been developed for selective depassivation of small regions on an otherwise passive metal surface with the use of a focused laser radiation. A nitrogen pumped dye laser provided a pulsed beam which was focused to a diameter of approximately 5 μm. The method was used to create corrosion sites on iron immersed in a solution of 0.1 M Na 2B 4O 7 containing NaCl in the range of 0.01 to 0.03 M. It was found that the corrosion rate was controlled by transport through a covering of corrosion products which precipitated over the site. The corrosion current from single sites increased with the square root of time, and with a proportionality factor that depended upon both the applied potential and chloride ion concentration.
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