Aromatic carboxylic acids and hydroxy compounds have been long recognized as important corrosion inhibitors. Subramanyam, et al.,1 and Makwana, et al.,2 have successfully shown that benzoic acid and its derivatives are effective inhibitors for steel and aluminum in HCl, respectively. Phenol has been reported by Desai and his co-workers3 to be an effective corrosion inhibitor for copper in alkali solution. It has, therefore, been of interest to investigate the applicability of these compounds for aluminum nitric acid systems as corrosion inhibitors.
The purpose of the present investigation is to assess the inhibitive efficiency of benzoic acid and its hydroxy and nitro derivatives for 1060 and 3003 aluminum alloys in 20% nitric acid and to provide some insight into the possible mechanism of inhibition.
The experimental solutions of nitric acid were prepared from Analar grade (BDH) nitric acid. All of the chemicals used as additives were...
