Correlation Analysis of the Inhibiting Effects of Various Organic Reagents on the Dissolution of Aluminum in 1,1,1-Trichloroethane.

Using data from a previous paper1) and such physical properties of organic reagents as melting point, boiling point, density, molecular weight and refractive index, as obtained from handbooks, the relationships between physical properties and the inhibiting effects of various organic reagents on the dissolution of aluminum in 1,1,1trichloroethane (CCl3CH3) were subjected to correlation analysis, and the choice of inhibitor was investigated from the standpoint of physical properties.The results are summarized as follows : 1) In the case of ethers and esters, the inhibiting effect increased with melting point, boiling point, molecular weight (number of carbon atoms) and density.2) In the case of phenols, alcohols, nitrocompounds, amines, ketones, nitriles and amides, physical properties had no influence on the inhibiting effect.3) In the case of monohydric alcohols, contrary to the result described in 1) above, the inhibiting effect had a tendency to decrease with increasing boiling point, molecular weight and density, that is, methyl and ethyl alcohols with a small molecular weight had a large inhibiting effect.4 ) The refractive indexes of the organic reagents used had no influence on the inhibiting effect.