Subject Passivation Based on Trivalent Chromium - SurTec

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Colour of chromitAL

After passivation

The layer is faintly blue-yellow. At a

sharp angle the iridescence is visible.

After salt spray test, 168 h

The untreated surface is corroded,

the chromitAL - layer is unchanged.

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<strong>Passivation</strong> Process – Layer Formation Activation of the surface: 2 Al + 6 H 3 O + 2 Al 3+ + 6 H 2 O + 3 H 2 The activation is assisted by fluorides. Deposition of the passivation layer: x Cr 3+ + y Al 3+ + z OH - Cr x Al y (OH) z Aluminium <strong>Passivation</strong> Layer (SurTec 650)

Colour of chromitAL After passivation The layer is faintly blue-yellow. At a sharp angle the iridescence is visible. After salt spray test, 168 h The untreated surface is corroded, the chromitAL - layer is unchanged.

Page 1 and 2: Passivation <stron
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Page 5: Passivation Proces
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Subject Passivation Based on Trivalent Chromium - SurTec

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