Corrosion of dental aluminium bronze in neutral saline and saline lactic acid
To compare the corrosion behaviours of two aluminium bronze, dental casting alloys during a standard immersion test and for immersion in neutral saline. Cast specimens of aluminium bronzes with 1.4 wt% Fe (G) and 4 wt% Fe (N) were subject to progressively longer periods (up to in total 7 days) immer...
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Veröffentlicht in: | Dental materials 2006-09, Vol.22 (9), p.793-798 |
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Hauptverfasser: | , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | To compare the corrosion behaviours of two aluminium bronze, dental casting alloys during a standard immersion test and for immersion in neutral saline.
Cast specimens of aluminium bronzes with 1.4
wt% Fe (G) and 4
wt% Fe (N) were subject to progressively longer periods (up to in total 7 days) immersed in 0.1
M saline, 0.1
M lactic acid solutions and examined by scanning electron microscopy with EDX analysis. Immersion in 0.1
M neutral saline was for 7 days.
In the acidic solution, exposed interdendritic volumes in alloy N corroded completely away in 7 days with dissolution of Ni-enriched precipitate species as well as the copper-rich matrix. Alloy G begins to corrode more slowly but by a similar mechanism. The number density of an Fe-enriched species is insufficient to maintain a continuous galvanic potential to the copper matrix, and dissolution becomes imperceptible. In neutral saline solution, galvanic action alone caused pit-etching, without the dissolution of either precipitate species.
The upper limit for the total dissolution of metallic ions in the standard immersion test can be set at 200
μg
cm
−2. Aluminium bronze dental alloys can be expected to release both copper and nickel ions into an acidic oral environment. |
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ISSN: | 0109-5641 1879-0097 |
DOI: | 10.1016/j.dental.2005.11.007 |