Corrosivity of long-term fire retardant Fire Trol® 931 and Fire Foam® 103 on aluminium alloys and steel

The aim of this paper is to evaluate the corrosion behaviour of aluminium and steel alloys in contact with Fire Trol® 931 and Fire Foam® 103 using electrochemical measures. Complementary results about morphology are obtained with microscopy before and after corrosion tests. Structure and composition of the corrosion products on the electrode surface are also analysed. In these solutions the corrosion rate of aluminium is low, whereas steel alloy shows a moderate corrosion. The anodic reaction of corrosion phenomenon favours the deposit of a Prussian blue layer on the metallic samples surface. This layer reduces the corrosion phenomenon on both aluminium and steel alloys.