Abstract
The wire beam electrode (WBE) method was employed to study water-line corrosion of carbon steel under static condition. It was found that, it was the thin electrolyte film that aggravated the corrosion of steel in water-line area, not the difference of oxygen concentration. The difference of oxygen concentration decided the location of cathode, which was near waterline, and the regularity of vertical current distribution under waterline. Besides, it was also found that, in water-line area, the peak of corrosion rate was located at about half of the region just below the waterline.
Highlights
The air-liquid-solid interface is the area where heavy corrosion always happens
Jeffrey[3,4] studied the corrosion of long vertical steel strips in the marine tidal zone
The trend of variations was similar to that in fully immersed zone. This illustrated the corrosive condition of the big wire beam electrode (WBE) was fairly stable, though it was an oxygen concentration cell, without thin electrolyte film, the corrosion could not be aggravated
Summary
The air-liquid-solid interface is the area where heavy corrosion always happens. This kind of corrosive phenomenon is widely found. Jeffrey[3,4] studied the corrosion of long vertical steel strips in the marine tidal zone It showed that the steel right near waterline had slightly corroded, the heaviest corrosion happened about at 250mm above the waterline and 200mm below the waterline. Jeffrey thought it was the alternant distribution of cathode and anode. Our study was to reveal the water-line corrosion mechanism of carbon steel in static 3.5% NaCl solution by the WBE technique. In the current distribution map, the ticks in x and y axis were column and row number of the microelectrode in the WBE, respectively
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