A new method of studying the corrosion inhibition mechanism of rare earth metal(REM) on LC4 Al alloy with the spilt cell technique was studied. The principle and experimental method of the spilt cell technique were analyzed. By measuring the change of net-electric current between the two electrodes caused by the change of the amount of oxygen in the solution and the addition of CeCl_3, the influence of corrosive performance of CeCl_3 on LC4 super-power aluminum alloy in the 0.1 mol·L -1 NaCl solution was investigated. Meanwhile, the conditional changes of pH values, CeCl_3 solution, additire and time of performance were also studied. Finally, the features of electrode surface were revealed by using SEM and X-ray energy-dispersive spectrometry (EDS). By combining these with other electric chemical techniques, such as potential-time curve, polarization curve et al. A new method of studying the corrosion inhibition mechanism of rare earth metal (REM) on LC4 Al alloy with the spilled cell technique was studied. The principle and experimental method of the spilled cell technique were analyzed. By measuring the change of net-electric current between the two electrodes caused by the change of the amount of oxygen in the solution and the addition of CeCl_3, the influence of corrosive performance of CeCl_3 on LC4 super-power aluminum alloy in the 0.1 mol·L -1 NaCl solution was investigated. , the conditional changes of pH values, CeCl_3 solution, additire and time of performance were also studied. Finally, the features of electrode surfaces were revealed by using SEM and X-ray energy-dispersive spectrometry (EDS). By combining these with other electric chemical techniques, such as potential-time curve, polarization curve et al.