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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 p ) of 0.3 Cr and 0.5 Cr steels was higher than that of 0 Cr steel, and the R p also increased as the Cr content increased. Therefore, Cr increases the corrosion resistance of automotive carbon steel immersed in a chloride ion (Cl - )-containing aqueous solution. In the cyclic corrosion test results, Cl - was concentrated at the metal/rust interface in all of the steels regardless of Cr content. The Cl - 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 - and Cr-goethite, while the outer rust layer was composed of amorphous iron oxyhydroxide mixed with various types of rust. FeCl 2 and CrCl 3 are formed from the Cl - nest developed in the early stage, and the pitting at CrCl 3 -formed regions are locally accelerated because Cr is strongly hydrolyzed to a very low pH.

Effect of Cr on Aqueous and Atmospheric Corrosion of Automotive Carbon Steel