Aqueouscorrosionbehaviorsofthelow-alloysteelswithsmallamountsofCr,Cu,NiandCainsynthetictapwaterwerestudiedbyelectrochemicalcorrosiontests(potentiodynamicpolarizationtests,electrochemicalimpedancespectroscopy(EIS))andanalyticaltechniques(XPS,EPMA).Potentiodynamicpolarizationtestrepresentedthatallcurvesshowedactivecorrosionbehaviorandcorrosionpotentialwasshiftedtonobledirectionandcorrosionratetendedtodecreaseastheresultofalloying.ResultsofEISmeasurementshowedthatthemorethecontentofelement,thelargerthepolarizationresistance.Itcanbeseenthattheseresultswerecausedbytheformationofacoherentprotectivefilm,whichcontainedalloyingelements.Actually,