Effect of Cr on Aqueous and Atmospheric Corrosion of Automotive Carbon Steel
This study investigated the effect of Cr alloying element on the corrosion properties of automotive carbon steel (0.1C, 0.5Si, 2.5Mn, Fe Bal., composition given in wt.%) in aqueous and atmospheric conditions using electrochemical measurement and cyclic corrosion tests. Three steels with 0, 0.3, and...
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doaj-f85c8991d87f48b797786c38e858fd932021-05-31T23:29:20ZengMDPI AGMaterials1996-19442021-05-01142444244410.3390/ma14092444Effect of Cr on Aqueous and Atmospheric Corrosion of Automotive Carbon SteelSang-won Cho0Sang-Jin Ko1Jin-Seok Yoo2Yun-Ha Yoo3Yon-Kyun Song4Jung-Gu Kim5Department of Materials Science and Engineering, Sungkyunkwan University, 2066 Seobu-Ro, Jangan-Gu, Suwon-Si 16419, KoreaDepartment of Materials Science and Engineering, Sungkyunkwan University, 2066 Seobu-Ro, Jangan-Gu, Suwon-Si 16419, KoreaDepartment of Materials Science and Engineering, Sungkyunkwan University, 2066 Seobu-Ro, Jangan-Gu, Suwon-Si 16419, KoreaPOSCO Global R&D Center, Steel Solution Research Laboratory, 100 Songdogwahak-Ro, Yeonsu-Gu, Incheon 21985, KoreaPOSCO Global R&D Center, Steel Solution Research Laboratory, 100 Songdogwahak-Ro, Yeonsu-Gu, Incheon 21985, KoreaDepartment of Materials Science and Engineering, Sungkyunkwan University, 2066 Seobu-Ro, Jangan-Gu, Suwon-Si 16419, KoreaThis study investigated the effect of Cr alloying element on the corrosion properties of automotive carbon steel (0.1C, 0.5Si, 2.5Mn, Fe Bal., composition given in wt.%) in aqueous and atmospheric conditions using electrochemical measurement and cyclic corrosion tests. Three steels with 0, 0.3, and 0.5 wt.% Cr were studied by electrochemical impedance spectroscopy. Polarization resistance (R<sub>p</sub>) of 0.3 Cr and 0.5 Cr steels was higher than that of 0 Cr steel, and the R<sub>p</sub> also increased as the Cr content increased. Therefore, Cr increases the corrosion resistance of automotive carbon steel immersed in a chloride ion (Cl<sup>−</sup>)-containing aqueous solution. In the cyclic corrosion test results, Cl<sup>−</sup> was concentrated at the metal/rust interface in all of the steels regardless of Cr content. The Cl<sup>−</sup> was uniformly concentrated and distributed on the 0 Cr steel, but locally and non-uniformly concentrated on the Cr-added steels. The inner rust layer consisted of β-FeOOH containing Cl<sup>−</sup> and Cr-goethite, while the outer rust layer was composed of amorphous iron oxyhydroxide mixed with various types of rust. FeCl<sub>2</sub> and CrCl<sub>3</sub> are formed from the Cl<sup>−</sup> nest developed in the early stage, and the pitting at CrCl<sub>3</sub>-formed regions are locally accelerated because Cr is strongly hydrolyzed to a very low pH.https://www.mdpi.com/1996-1944/14/9/2444automotive steelatmospheric corrosionelectrochemical impedance spectroscopycyclic corrosion testiron oxide |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Sang-won Cho Sang-Jin Ko Jin-Seok Yoo Yun-Ha Yoo Yon-Kyun Song Jung-Gu Kim |
spellingShingle |
Sang-won Cho Sang-Jin Ko Jin-Seok Yoo Yun-Ha Yoo Yon-Kyun Song Jung-Gu Kim Effect of Cr on Aqueous and Atmospheric Corrosion of Automotive Carbon Steel Materials automotive steel atmospheric corrosion electrochemical impedance spectroscopy cyclic corrosion test iron oxide |
author_facet |
Sang-won Cho Sang-Jin Ko Jin-Seok Yoo Yun-Ha Yoo Yon-Kyun Song Jung-Gu Kim |
author_sort |
Sang-won Cho |
title |
Effect of Cr on Aqueous and Atmospheric Corrosion of Automotive Carbon Steel |
title_short |
Effect of Cr on Aqueous and Atmospheric Corrosion of Automotive Carbon Steel |
title_full |
Effect of Cr on Aqueous and Atmospheric Corrosion of Automotive Carbon Steel |
title_fullStr |
Effect of Cr on Aqueous and Atmospheric Corrosion of Automotive Carbon Steel |
title_full_unstemmed |
Effect of Cr on Aqueous and Atmospheric Corrosion of Automotive Carbon Steel |
title_sort |
effect of cr on aqueous and atmospheric corrosion of automotive carbon steel |
publisher |
MDPI AG |
series |
Materials |
issn |
1996-1944 |
publishDate |
2021-05-01 |
description |
This study investigated the effect of Cr alloying element on the corrosion properties of automotive carbon steel (0.1C, 0.5Si, 2.5Mn, Fe Bal., composition given in wt.%) in aqueous and atmospheric conditions using electrochemical measurement and cyclic corrosion tests. Three steels with 0, 0.3, and 0.5 wt.% Cr were studied by electrochemical impedance spectroscopy. Polarization resistance (R<sub>p</sub>) of 0.3 Cr and 0.5 Cr steels was higher than that of 0 Cr steel, and the R<sub>p</sub> also increased as the Cr content increased. Therefore, Cr increases the corrosion resistance of automotive carbon steel immersed in a chloride ion (Cl<sup>−</sup>)-containing aqueous solution. In the cyclic corrosion test results, Cl<sup>−</sup> was concentrated at the metal/rust interface in all of the steels regardless of Cr content. The Cl<sup>−</sup> was uniformly concentrated and distributed on the 0 Cr steel, but locally and non-uniformly concentrated on the Cr-added steels. The inner rust layer consisted of β-FeOOH containing Cl<sup>−</sup> and Cr-goethite, while the outer rust layer was composed of amorphous iron oxyhydroxide mixed with various types of rust. FeCl<sub>2</sub> and CrCl<sub>3</sub> are formed from the Cl<sup>−</sup> nest developed in the early stage, and the pitting at CrCl<sub>3</sub>-formed regions are locally accelerated because Cr is strongly hydrolyzed to a very low pH. |
topic |
automotive steel atmospheric corrosion electrochemical impedance spectroscopy cyclic corrosion test iron oxide |
url |
https://www.mdpi.com/1996-1944/14/9/2444 |
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