<i>The Mackenzie King Record</i>. J. W. Pickersgill

Wittke, Carl

doi:10.1086/238902

Cited by 1 publication

(2 citation statements)

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“…Therefore, the electrochemical reactions, i.e., chromate reduction and Al dissolution, can still take place and the CCC continues to grow. [13][14][15][16][17] Once the first layer of condensed polymeric particles has been formed, the process of gelation and film formation can still continue, because the permeability and the ionic conductivity of the gels are relatively high due to their open structure and high water retention. 3͒, at least up to 60 s of immersion.…”

Section: Resultsmentioning

confidence: 99%

“…4,5 For some applications, as car wheels and window frames, adequate chromatefree treatments have been developed and are already in use. [13][14][15][16][17] In addition, the morphology of relatively thick chromate films resembles the cracking of mud on the micrometer level. Recently, a new approach has been taken in the development of new surface treatments providing corrosion protection for aluminum equivalent to the chromate one.…”

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confidence: 99%

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Chromate Conversion Coating on Aluminum Alloys

Campestrini¹,

Goeminne²,

Terryn

et al. 2004

J. Electrochem. Soc.

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The formation of chromate conversion coatings ͑CCCs͒ on commercially pure Al ͑AA1050͒ during immersion in a chromic/ hydrofluoric acid solution has been investigated. A film formation mechanism is proposed based on the combination of open circuit potential measurements and surface analysis techniques, such as Auger electron spectroscopy and atomic force microscopy. It is suggested that the conversion of the Al surface takes place in three distinct stages: activation of the surface, initiation of the film formation, and growth of the conversion layer. In addition to the classical approach, a sol-gel model was considered for the initiation and growth of the film. The effect of the free fluoride and chromic acid concentration was studied using a thermodynamic model, whereas the influence of the Al oxide film was investigated by forming an anodic barrier layer prior to the conversion process. It was shown that the rate-determining step in the CCC formation is the activation of the Al surface. Therefore, the morphology and structure of the conversion layer is determined not only by the bath composition but also by the thickness of the Al oxide film.

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%