A facile chemical screening method for the detection of stress corrosion cracking in 9 carat gold alloys

Neumeyer, B.; Hensler, John H.; O’Mullane, Anthony P.; Bhargava, Suresh K.

doi:10.1007/bf03214936

Cited by 1 publication

(2 citation statements)

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“…Rapson [3] stated that the susceptibility of 14 carat quaternary Au-Ag-Cu-Zn alloys to SCC was influenced considerably by both the Zn content and heat treatment. Neumeyer and co-workers [10] compared the SCC behaviour of a series of 9 carat gold alloys with varying compositions of Ag, Cu and Zn. Their studies revealed that SCC behaviour appeared to be related to differences in Zn content rather than Cu content, for alloys containing the same Au and Ag content.…”

Section: Effect Of Composition On the Corrosion Behaviour Of Gold Alloysmentioning

confidence: 99%

“…Numerous studies have been conducted on the mechanisms and consequential effects of stress corrosion cracking (SCC), a well-known form of environmental attack in low carat gold jewellery, particularly below 14 carat gold content [3][4][5][6][7][8][9][10]. While there appears to be less information available on other forms of corrosion, such as pitting and intergranular corrosion, the concepts of selective leaching of alloying elements to modify alloys for decorative purposes has been around for many years [11,12].…”

Section: Introductionmentioning

confidence: 99%

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The electrochemical corrosion behaviour of quaternary gold alloys when exposed to 3.5 % NaCl solution

2013

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Lower carat gold alloys, specifically 9 carat gold alloys, containing less than 40 % gold, and alloying additions of silver, copper and zinc, are commonly used in many jewellery applications, to offset high costs and poor mechanical properties associated with pure gold. While gold is considered to be chemically inert, the presence of active alloying additions raises concerns about certain forms of corrosion, particularly selective dissolution of these alloys. The purpose of this study was to systematically study the corrosion behaviour of a series of quaternary gold-silvercopper-zinc alloys using dc potentiodynamic scanning in saline (3.5 % NaCl) environment. Full anodic/cathodic scans were conducted to determine the overall corrosion characteristics of the alloy, followed by selective anodic scans and subsequent morphological and compositional analysis of the alloy surface and corroding media to determine the extent of selective dissolution. Varying degrees of selective dissolution and associated corrosion rates were observed after anodic polarisation in 3.5 % NaCl, depending on the alloy composition. The corrosion behaviour of the alloys was determined by the extent of anodic reactions which induce (1) formation of oxide scales on the alloy surface and or (2) dissolution of Zn and Cu species. In general, the improved corrosion characteristics of alloy #3 was attributed to the composition of Zn/Cu in the alloy and thus favourable microstructure promoting the formation of protective oxide/chloride scales and reducing the extent of Cu and Zn dissolution.

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Section: Effect Of Composition On the Corrosion Behaviour Of Gold Alloysmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The electrochemical corrosion behaviour of quaternary gold alloys when exposed to 3.5 % NaCl solution

2013

View full text Add to dashboard Cite

show abstract

A facile chemical screening method for the detection of stress corrosion cracking in 9 carat gold alloys

Cited by 1 publication

References 15 publications

The electrochemical corrosion behaviour of quaternary gold alloys when exposed to 3.5 % NaCl solution

The electrochemical corrosion behaviour of quaternary gold alloys when exposed to 3.5 % NaCl solution

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