𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Tarnish and corrosion evaluation of a blue gold-based alloy

✍ Scribed by O. Carvalho; D. Soares; A. Fonseca; F. S. Silva


Book ID
102937325
Publisher
John Wiley and Sons
Year
2009
Tongue
German
Weight
507 KB
Volume
60
Category
Article
ISSN
0947-5117

No coin nor oath required. For personal study only.

✦ Synopsis


Abstract

The use of some coloured gold alloys is dependent on the physical stability of the material when subjected to a corrosion media. This paper is concerned with the effect of two common detrimental environments (sweat and sulphuric solutions) on the stability of a blue gold‐base alloy. Changes in physical properties, namely colour and brightness, were evaluated with time. It was observed that, for sulphuric solution, significant changes were obtained even for small immersion times. For the artificial sweat solution, changes occur, but the alloy is significantly more resistant. The alloy corrosion mechanisms are presented for both types of solutions. The products of corrosion were characterized by optical and SEM/EDS microscopy and by XPS spectroscopy. A comparison of the corrosion mechanisms, between the two immersion solutions, is also presented.


πŸ“œ SIMILAR VOLUMES


In vitro corrosion and tarnish character
✍ Vaidyanathan, T. K. ;Prasad, A. πŸ“‚ Article πŸ“… 1981 πŸ› John Wiley and Sons 🌐 English βš– 633 KB

## Abstract Analysis of the anodic polarization and alternate immersion test response of 16 precious metal alloys with compositions similar to those of commercial dental golds indicate that alloys containing high (Ag + Cu) contents are likely to be more corrosion and tarnish prone. It also appears

Study of a purple gold-based alloy resis
✍ O. Carvalho; D. Soares; A. Fonseca; F. S. Silva πŸ“‚ Article πŸ“… 2009 πŸ› John Wiley and Sons 🌐 German βš– 445 KB

## Abstract The stability of some coloured gold alloys is dependent on the environment. In this work, the effect of a sulphuric solution on the physical properties of a purple gold‐based alloy is studied. Changes in the physical properties of the samples namely colour, brightness and reflectance we