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PCD - A new white colour in Cosmetic Industry:Trivalent chromium (Cr(III)).

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Last February, Serge Brigot gave a conference on PCD - Packaging Of Perfume Cosmetics & Design about "A new white colour in Cosmetic Industry:Trivalent chromium (Cr(III))."
http://www.pcd-congress.com

Il existe plusieurs technologies pour chromer une pièce electrochimiquement,en effet sur une pièce sur laquelle on a déjà déposé du cuivre puis du nickel ,il est possible de chromer à partir d'une solution de chrome hexavalent c’est-à-dire de la forme 6+ du chrome ou à partir d'une solution de chrome trivalent (forme 3+ du chrome).
Dans les deux ,le métal déposé est chrome au degré d'oxydation 0.
La première technique est la plus ancienne et communément exploitée dans le monde ,la deuxième technologie est plus recente .
Le chrome sous sa forme 6+ est classe CMR alors que le 3+ n'est pas classe .
La couleur du métal déposé (le chrome en l'occurrence dans les deux cas) est dit blanc bleute dans le premier cas ,alors qu'il est plus blanc dans le second.
Il convient de tester ces deux dépôts métalliques afin de déterminer si les différences de comportement sont acceptables ,ce que l'on peut présager dans le cadre de la Parfumerie Cosmétique.

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PCD - A new white colour in Cosmetic Industry:Trivalent chromium (Cr(III)).

  1. 1. A NEW WHITE COLOUR IN COSMETIC INDUSTRY: TRIVALENT CHROMIUM (CR(III)). Conference by Serge Brigot for Graindorge at PCD in February, 2015
  2. 2. DON’T MISS THE 2016 EDITION WITH MORE THAN 90 SPEAKERS! GET YOUR BADGE STARTING SEPTEMBER ON WWW.PCD- CONGRESS.COM
  3. 3. Some Definitions: • Chromium (0)White metal with high corrosion and tarnish resistance. • Chrome plate  process using the Hexavalent chromium form Cr(VI) in electrolytic solution to obtain the chrome metal form (0). (decorative,automotive,mecanical use,) • Chromatation  Chemical conversion ,using the hexavalent form,use to increase the corrosion resistance after Zinc electroplating for example, (Automotiv in the past,military use …) Only chrome metal = without any Cr(VI) Cr(VI) on the top
  4. 4. Toxicological Profile for Hexavalent Chromium • Formula: Chromic trioxyde: Cr03, • Physical state,appearance: Odourless,dark red crystals,flakes or granular powder : • Chemicals Properties: the substance decompose above 250 °C to chromic oxide and oxygen,which increases fire azard,The substance is a strong oxidant and reacts violently with combustible and reducing materials causing fire and explosion hazard. • Hazard Pictograms: • Risks: the substance is corrosive to the eyes,skin and the respiratory tracts.Corrosive on ingestion,This substance is carcinogenic to human,may cause heritable genetic damage to human germ cells,Toxic for human reproduction or development. O - Comburant T+ - Très toxique
  5. 5. Trivalent Chrome Hexavalent Chrome alternative
  6. 6. Toxicological Profile for Chrome sulfate (trivalent chrome) • Formula: Cr2(SO4)3,6H2O • Hazard and Pictogram: ? • Risks: ?
  7. 7. Comparaison hexavalent/trivalent chrome - Work Station - Hexavalent Trivalent Carcinogenic Not carcinogenic Lead Compound Formation Without any lead compound formation Standard Rectifier for electric power High tension Rectifier High tolerance for Metallics Impurities Not at all tolerance for M.I 3 steps for waste treatment 1 step
  8. 8. Trivalent Chrome Métal Maximal concentrations in the bath Nickel < 100 ppm Cupper < 10 ppm Iron < 60 ppm Zinc < 5 ppm Lead < 10 ppm The electrolytic bath need more cleaning treatment. Tolerance for Metallics Impurities:
  9. 9. Comparative Degree of white colour by Lab measurement. -8 -6 -4 -2 0 2 4 6 8 -1 -0,9 -0,8 -0,7 -0,6 -0,5 -0,4 -0,3 -0,2 -0,1 0 0,1 0,2 0,3 0,4 0,5 0,6 0,7 0,8 0,9 1 Hex. Chrome L=83,69 Silver L=97,49 Chrome 3 L=80,05 Nickel L=81,56 White bronze L=83,94 Red Yellow Blue Green L*: Black (0)  White (100) a*: Green (-)  Red (+) b*: Blue (-)  Yellow (+)
  10. 10. Conclusions • Sustainable developement,important reduction of the impact on the environment. • Cost of plating a few higher. • Important step in the reduction of CMR substances. • The etching step in the attack of ABS is still using the Cr(VI) form ,but we can be hopeful of a good outcome in that regard.

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