- Wong, D. and Cocks, F.H., The use of zinc to control aluminum corrosion in aqueous glycol solutions,
Corrosion (USA), vol. 36 no. 11
pp. 587 - 91 .
(last updated on 2007/04/10)
Aluminum and its alloys are highly susceptible to pitting corrosion in aqueous glycol solutions, especially when chloride and heavy metal ions (Cu+2 and Fe+3) are present. One approach to controlling such corrosion is the use of scavengers to remove the deleterious species from solution, and the role of zinc as an effective heavy metal ion scavenger has been confirmed. In addition, it was discovered that zinc powder in suspension is capable of stopping aluminum pitting corrosion in aqueous glycol solutions containing chloride ions. Zinc is not expected to act as a chloride ion getter. However, it has been established that zinc also gives a protective effect through a cathodic protection mechanism produced by the zinc powder contacting the aluminum surface and concomitantly lowering the open-circuit potential of the aluminium sample to below its critical pitting potential