In this study, corrosion inhibition of the additively manufactured AlSi10Mg was investigated in 3.5% NaCl solution with the addition of 1% and 3% NH4NO3. The potentiodynamic polarization and electrochemical impedance spectroscopy tests were performed in order to reveal the corrosion behavior of the AlSi10Mg. The corrosion inhibition behavior of the AlSi10Mg was determined by analyzing the Tafel curves, phase angle/frequency curves and equivalent circuit results. Moreover, microstructures of the produced sample and corroded surfaces were investigated with light metal microscopy. It was stated that the corrosion rate value of the AlSi10Mg is reduced with the presence of NO3- in 3.5% NaCl solution. On the other hand, the surface/solution interaction was reduced by adding NH4NO3 into 3.5% NaCl solution. It can be clearly emphasized that using 3% NH4NO3 is quite effective in improving the corrosion behavior of AlSi10Mg in 3.5% NaCl.