Abstract
The electrochemical observation of AA 5083 alloy, which has been used as a structural material in high speed ship, was carried out in flow condition of 3.0% NaCl solution at 20°C through rotating disc type apparatus, which is easy to control flow velocity. As a result, it has been observed that the corrosion behavior of AA5083 alloy is affected by the changes in corrosion surface and hydrodynamic flow pattern transiting from laminar to turbulent flow. The surface oxide film was almost left in laminar condition (below 2000 rpm, Re≤1.7×105) and was disrupted partially due to the eddy flow in transition condition (at 3000 rpm, 1.7×105 Re≤3.5×105). The overall attack was observed by the removal of surface oxide film in turbulent condition (above 4000 rpm, Re≥3.5×105). It was also supported by the sharp change in open-circuit potential (OCP) and the changes in the anodic polarization behavior at transition region.
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