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Example of screening of systems 12 weeks exposure with salt 4, “Maritime solution” + AlCl 3 to pH 4 4 Rank Adhesive delamination Corrosion on bare surface Ranking 3 2 1 Delamination Corrosion 0 1 2 0% 0-5% 5-15% No corrosion No surface corrosion, some pitting corrosion Surface corrosion, no or very limited pitting 0 1 2 3 4 5 6 7 8 Material No. Systems responds differently and ranking is obtained. 3 4 15-30% >30% Surface and pitting corrosion Surface corrosion and extensive pitting and general corrosion (> 30% of surface) Date: 2004-01-13 • Page: 24 • Hydro Aluminium
Tested materials Adhesive Heat curing epoxy, XD 4600, Dow Surface Hot AC (alternated current) anodised 3105 (Material 2) – Iron rich metal, reactive surface layer converted? 5754 passivated (Material 4) – ? Date: 2004-01-13 • Page: 25 • Hydro Aluminium
Page 1 and 2: Hydro Aluminium Light Metal Surface
Page 3 and 4: Introduction Maybe little of a gene
Page 5 and 6: Accelerated lap shear testing A ra
Page 7 and 8: Failure surfaces, after 1 year on t
Page 9 and 10: Main ageing notes Outdoor, wit
Page 11 and 12: Mud weight vs. Relative humidity No
Page 13 and 14: pH values measured for the salt sol
Page 15 and 16: Test conditions Test plates were c
Page 17 and 18: Average weight loss for the differe
Page 19 and 20: Average pit depth after four weeks
Page 21 and 22: Requirements on a corrosion screeni
Page 23: Salt solutions Salt no. 1 2 3 4 5 6
Page 27 and 28: 5754 passivated, 3 months exposure
Page 29 and 30: Summary, salt solution tests Acidi
Page 31 and 32: Baseline testing, ambient condition
Page 33 and 34: Failure modes (2) Interfacial failu
Page 35 and 36: TEM, Altered layer on etch (2) Long
Page 37 and 38: Summary, environmental fatigue test
Page 39: Conclusion Durable bonded joints r

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