Aqueous corrosion behaviors of the low-alloy steels with small amounts of Cr, Cu, Ni and Ca in synthetic tap water were studied byelectrochemical corrosion tests (potentiodynamic polarization tests, electrochemical impedance spectroscopy (EIS)) and analytical techniques(XPS, EPMA). Potentiodynamic polarization test represented that all curves showed active corrosion behavior and corrosion potential wasshifted to noble direction and corrosion rate tended to decrease as the result of alloying. Results of EIS measurement showed that the morethe content of element, the larger the polarization resistance. It can be seen that these results were caused by the formation of a coherentprotective film, which contained alloying elements. Actually,

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