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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

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