Comparison of influences of NaCl and CaCl2 on the corrosion of 11% and 17% Cr ferritic stainless steels during cyclic corrosion test |
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Authors: | Won-Jin Beom Chan-Jin Park Han-Jin Ryu |
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Affiliation: | a Department of Materials Science and Engineering, Chonnam National University, 77, Yongbong-ro, Buk-gu, Gwangju 500-757, Republic of Korea b Stainless Steel Research Group, Technical Research Lab., POSCO, 1, Goedong-dong, Nam-gu, Pohang 790-785, Gyeongbuk, Republic of Korea |
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Abstract: | During the drying stage of the cyclic corrosion test on ferritic stainless steels in the NaCl environment, the current abruptly increased and then decreased to nearly zero, indicating that pits are initiated as the salt concentration is increased, which are then repassivated when the surface is completely dry. During the wet stage, the current remained high, suggesting that pits mainly propagate during the wet stage. In contrast, in the cyclic corrosion test in the CaCl2 environment, the current was highest during the drying stage, indicating that the electrolyte is not completely dried and corrosion mainly propagates during the drying stage. |
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Keywords: | A Stainless steel B Polarization C Atmospheric corrosion C Pitting corrosion |
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