
%0 Journal Article
%A Berzins, A 
%A Lowson, RT 
%A Mirams, KJ 
%T Aluminium corrosion studies. III. Chloride adsorption isotherms on corroding aluminium
%J Australian Journal of Chemistry
%D 1977/09/01
%V 30
%N 9
%P 1891-1903
%K 
%R https://doi.org/10.1071/CH9771891
%U https://www.publish.csiro.au/paper/CH9771891 
%X The adsorption isotherms for chloride on a corroding aluminium surface have been measured by using 36Cl as a radioactive tracer. The amount of chloride adsorbed, wCl, was a function of chloride concentration, [Cl], and time, t, according to                           log WCl = 0.64(log[Cl]+log t)-7.8   where wCl is expressed as g cm-2, [Cl] as mol l-1 and t as minutes. Superimposed on the general curve was a fine structure which correlated with the stages of development of a corroding aluminium surface. The adsorption was localized to corroding pit sites. Addition of nitrate or sulphate delayed but did not prevent the uptake of chloride; the hydroxide ion was considered to have a similar effect. It was concluded that a corroding aluminium surface has a variety of adsorption sites with different adsorption properties; only a minority of these sites are potential or active sites for pitting corrosion. 
