Attempts have been made to obtain the manganese spinel (MnAl₂O₄) by using corrosion of manganese and aluminium chloride as catalysis. Particle diameter range of 10 − 350 micrometers was obtained when the corrosion product was hydrolyzed and calcinated at the temperature of 1573 K or more. The powder was identified as MnAl₂O₄ spinel by XRD diffraction analysis. Corrosion synthesis as one of the inorganic synthesis is explained from the viewpoint of electrochemical phenomena and considered its merits and demerits in the case of making the spinel of MnAl₂O₄.