Abstract
Several methods of protection of aluminium alloys to corrosion in contact with diss milar metals, that is inserting of zine plate, cadmium plate and calking paste, are compared about their effect combined to the painting.Tests were carried out in respect to the change of appearance and the decrease of tensile properties of aluminium alloys after corrosion in 5.85%NaCl + 0.3%H2O2 solution for 1 month and 3 months. To the panel plate of 52S-O or ND-O one band of mild steel or brass was attached by means of mild steel r vets. Many combinations of vehicles and pigments as calkcng paste were compared on the effect of protection from contact corrosion, resulting that the paste of alkyd resin containing aluminium powder, zinc powder and zinc-chromate were proved to be the most effective. After this, when aluminium alloy plate is not painted, inserting of zinc plate is the most effective, while the consumption of zinc is comparatively large. When aluminium alloy plate is painted, inserting zinc plate unfavourably destroies the paintcoats. So the calking of paste between aluminum and dissimilar metal band before finish painting is the best.
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