Combating the corrosion effect on the steel structure of car body from sea water of local areas in Nigeria is the thrust of this research. Low carbon steel corrosion inhibition in seawater environment was investigated with sodium carbonate (Na₂CO₃). Steel samples were immersed in 400 dm³ seawater from Ureje community area in Ado Ekiti Nigeria with 0.01M and 0.1M Na₂CO₃ as the inhibitor. The electrochemical method of corrosion measurement was adopted for the study. The electrochemical behaviour was investigated with PGSTAT 101 Metrohm Potentiostat using Saturated Ag/AgCl Electrode as the counter electrode. The polarization curves were fixed at ±1.5 mV. Potentiodynamic polarization parameters obtained gave inhibition efficiency of Na₂CO₃ on the low carbon steel as 40.4% and 98.6% at 0.01M and 0.1M respectively. Thus, sodium carbonate formed an active corrosion inhibitor for low carbon steel in Ureje seawater environment. It could be introduced into the seawater in the stated concentration for a cleansing of steel structure in the car body.