抄録
An organic compound acting as a soft base is readily chemisorbed on a metal acting as a soft acid, resulting in high inhibition efficiency of the compound for corrosion of the metal in an acid solution. With respect to the corrosion of Ti in 3M HClO4 and of Mn in 0.3M HClO4, the inhibition efficiency of the compounds of which polar atoms belong to the 6B or 7B group in the periodic table was confirmed to be closely related to the hard and soft acids and bases principle (HSAB principle). Softnesses of the metals as the acids were also estimated by using the relation-ship between the efficiency and the principle.
