Basic Aluminum Chloride Research Articles

Kinetics of precipitation of aluminium 8-quinolinolate from basic aluminium chloride

AlCl 3 precipitates quantitatively as Al(8-quinolinolate) 3 at 20° in 0·5 hr, whereas the amount of aluminium precipitating from Al 2(OH) 5Cl ( 5 6 basic) as 8-quinolinolate depends on time and temperature with an apparent activation energy of 27·9 ± 1·4 kcal. This behaviour is interpreted as due to equilibria between polynuclear aluminium cations in the 5 6 basic solution.

Pitting corrosion of aluminium in sodium chloride solutions

AbstractThe anodic corrosion process in an artificial pit in aluminium undergoing active corrosion in dilute sodium chloride has been examined by pH and potential measurements and by schlieren observations. Evidence is produced that corrosion continues and spreads mainly in a downwards direction due to the special ability of aluminium chloride solutions to activate passive aluminium surfaces, thus extending the area of active metal along the flow path of this solution.It is shown that the anodic solution can dissolve large amounts of aluminium hydroxide yet still exhibit this behaviour. Insoluble anodic products, postulated by previous workers, would seem to occur in a minor degree, if at all, inside of the pit itself; any anodic hydrogen evolution would probably produce a basic aluminium chloride solution, not a mixture of hydroxide and stoicheiometric chloride.

アルミニウム化合物の研究 (第7報)

The properties of basic aluminum sulfate, formed by the combination of hydroxoaluminum ion and sulfate ion in the basic aluminum chloride solution, differs according to the degree of ionic condensation. The substances formed by combination with ions of greater degree of corsdensation are in globular form in the majority, generally possess smooth appearance, rapidly dissolve in dilute hydrochloric acid, and easily liberate the sulfate ion with alkali to form aluminum hydroxide. On the other hand, the substances formed by combination with ions of lower degree of condensation do not show such properties. Titration of basic aluminum sulfate in paste form with alkali showed that the pH curve does not show almost any jump but the solution obtained by separation of that paste does. Therefore, there is a great difference in the pH of a solution containing the paste and that of a solution separated from it. The pH of the solution, during the formation of basic aluminum sulfate in the solution, lowers irrespective of the manner of its preparation and n.