An unusual phenomenon observed when anodising CP titanium to produce coloured surfaces for jewellery and other decorative uses

Bartlett, L.

doi:10.1016/j.optlastec.2005.06.026

Cited by 33 publications

(25 citation statements)

References 7 publications

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“…This is consistent with the findings of Anon [18] and Nazim [19] who used electrolysis on more reactive metals such as zinc and brass. It is slightly surprising that anodising was unsuccessful as it is known in the anodising industry that fingermarks can produce defects in the anodising of goods, and anodising is used artistically and commercially to produce interference colours [22]. One possible explanation is the high resistance of the protective oxide film due to the low vacancy defects and hence higher potential or longer time may be required for these passive metals.…”

Section: Anodisingmentioning

confidence: 99%

The interaction of fingermark deposits on metal surfaces and potential ways for visualisation

Wightman

Emery

Austin

et al. 2015

Forensic Science International

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The interaction of fingermark deposits on metals has been examined by a variety of techniques. Visualisation by film growth has been the main area of investigation through: thermal oxidation, anodising, peroxide solution, and the interaction with vapour of iodine and ammonium sulphide. Corrosion of the underlying metal has also been examined as an alternative means of visualisation. Confocal microscopy was used to look at the film thickness and corrosion products around the prints. Scanning electron microscopy and energy dispersion of X-rays (SEM-EDX) examined a number of metal samples to investigate film growth and the elemental distribution. The observations suggest that differential oxidation was occurring as well as corrosion into the metal. Fingermark deposits on metals can corrode into the metal depending on the reactivity of the metal and leave a recoverable mark. However, fingermark deposits can also alter the rate of chemical reaction of the substrate metal by oxidation. In some cases organic matter can inhibit reaction, both when forming an oxide layer and when corroding the metal. However, signs of third level detail from pore contact may also be visible and the monovalent ions from salts could also influence film growth. Whilst further work would need to be carried out to decide whether any of these techniques may have application in fingermark recovery, this study does suggest that fingermarks on metals may be recoverable after incidents such as fires or immersion in water.

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Section: Anodisingmentioning

confidence: 99%

The interaction of fingermark deposits on metal surfaces and potential ways for visualisation

Wightman

Emery

Austin

et al. 2015

Forensic Science International

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“…Oxygen generated at the anodic surface then combines with the titanium to form titanium oxide. As the oxide thickens it increasingly acts as an electrical insulator between the electrolyte and the anode until the point where there are too few OH-ions available to support further growth, The oxide thickness at which this occurs is primarily a function of the applied voltage but there have been a large number of studies on the properties of the oxide films [13][14][15][16], which have showed that the composition and microstructure of the anodic oxides are also strongly dependent on other factors such as electrolyte concentration, temperature and anodic surface conditions [17]. This means there are a lot of variables to control for an artist.…”

Section: Introductionmentioning

confidence: 99%

“…The additional oxides created during laser treatment were said to be part of a deeper layer which was not significant for appearance. Carey et al [21] drew attention to the potential of lasers in the Jewellery industry, but Bartlett noted the unpredictability of the evenness of colours developed in this way, attributing it to 'flower oxides' [17].…”

Section: Introductionmentioning

confidence: 99%

Laser surface colouring of titanium for contemporary jewellery

O’Hana¹,

Pinkerton²,

Shoba³

et al. 2008

Surface Engineering

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This paper describes work which emerged through a need to understand more about the potential of laser surface engineering for use in the creative industries. The method of creation of contemporary jewellery pieces and the resultant 'Ocular' jewellery series are described from the points of view of an artist and an engineer. The work demonstrates how laser controlled oxide growth on commercially pure titanium under ambient conditions can be used as an artistic tool by producing even, defined colours or by reproducing a simulation of freehand drawings on a titanium surface. It also asks the question: how different are artists from scientists and engineers?

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“…Based on the experimental observation, it was showed that the passive film formed on titanium surface in low concentrations of acetic acid range which from 0.001 to 0.1 M ( figure 1(b-d)). The flower-like structures [29] were visible on the substrates which anodised in 1 M acetic acid. Moreover, upon increase concentration of acetic acid the surface morphologies shown the concentration of the flower was developed and increased as shown in figure 1e -1f.…”

Section: Resultsmentioning

confidence: 99%

Scanning Electron Microscope for Characterising of Micro- and Nanostructured Titanium Surfaces

Aeimbhu¹

2012

Scanning Electron Microscopy

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An unusual phenomenon observed when anodising CP titanium to produce coloured surfaces for jewellery and other decorative uses

Cited by 33 publications

References 7 publications

The interaction of fingermark deposits on metal surfaces and potential ways for visualisation

The interaction of fingermark deposits on metal surfaces and potential ways for visualisation

Laser surface colouring of titanium for contemporary jewellery

Scanning Electron Microscope for Characterising of Micro- and Nanostructured Titanium Surfaces

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