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Evaluation of corrosion resistance by electrochemical method for Ni-Cr-Mo-V steel
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 Title & Authors
Evaluation of corrosion resistance by electrochemical method for Ni-Cr-Mo-V steel
Kwon, Jae-Do; Moon, Yun-Bae;
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 Abstract
When the structures are exposed to their own an application for a long period, a number of variables such as strength properties and corrosion resistance, so on are expected to change. In the present investigation the corrosion behavior and resistance for the original and degraded materials of Ni-Cr-Mo-V steel were evaluated under the conditions of pH 3, 6, 9 and 12 in a distilled water environment. The electrochemical polarization technique was employed in this investigation. Based upon the experimental results obtained, the following conclusions were drawn. A severe and uniform corrosion was observed for both original and degraded materials under the condition of pH 3. At pH 6 and pH 9, these materials showed the degradation by a pitting corrosion. The materials under pH 12 environment were degraded by a uniform corrosion. The corrosion rate per year were the highest in the pH 3 environment, followed by pH 12, pH 6 and pH 9 environment in order. The corrosion resistance was decreased from the original material, slow cooled material (10.deg. C/hr) and step cooled material in order.
 Keywords
Corrosion Resistance;Electrochemical Polarization;Original Material;Degraded Material;
 Language
Korean
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