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Example of screening of systems<br />
12 weeks exposure with salt 4, “Maritime solution” + AlCl 3 to pH 4<br />
4<br />
Rank<br />
Adhesive<br />
delamination<br />
Corrosion on<br />
bare surface<br />
Ranking<br />
3<br />
2<br />
1<br />
Delamination<br />
Corrosion<br />
0<br />
1<br />
2<br />
0%<br />
0-5%<br />
5-15%<br />
No corrosion<br />
No surface<br />
corrosion, some<br />
pitting corrosion<br />
Surface<br />
corrosion, no or<br />
very limited<br />
pitting<br />
0<br />
1 2 3 4 5 6 7 8<br />
Material No.<br />
Systems responds differently and ranking is obtained.<br />
3<br />
4<br />
15-30%<br />
>30%<br />
Surface and<br />
pitting corrosion<br />
Surface<br />
corrosion and<br />
extensive pitting<br />
and general<br />
corrosion (><br />
30% of surface)<br />
Date: 2004-01-13 • Page: 24 • Hydro Aluminium