L'anticorrosion, les défis du futur in GALVANO ORGANO, N° 807 (12/2011)

[article]  inGALVANO ORGANO > N° 807 (12/2011) . - p. 28-30 Titre : L'anticorrosion, les défis du futur Type de document : texte imprimé Année de publication : 2011 Article en page(s) : p. 28-30 Langues : Français (fre) Catégories : Aéronautique Anticorrosion Chrome hexavalent Sol-gel, Procédé Index. décimale : 620.112 Résistance et autres propriétés des matériaux, essais non destructifs Résumé : C'est l'intitulé de la journée organisée le 24 mars dernier par le CRITT-MDTS et ses partenaires, Certech et Gegena, à Charleville-Mézières, un des deux sites du CRITT-MDTS. Retour sur les conférences avec le point de vue des universitaires et des industriels sur les enjeux de la corrosion. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12929 [article]

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Automatic on-line determination of trace chromium(VI) in chromium(III)-bearing samples by reverse adsorption process / Minghua Liu in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 86, N° 1 (01-02/2002)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 86, N° 1 (01-02/2002) . - p. 1-5 Titre : Automatic on-line determination of trace chromium(VI) in chromium(III)-bearing samples by reverse adsorption process Type de document : texte imprimé Auteurs : Minghua Liu, Auteur ; Xinsheng Zhang, Auteur Année de publication : 2002 Article en page(s) : p. 1-5 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorbants et adsorbants Adsorption Analyse par injection en flux continu L’analyse par injection en flux continu (Flow Injection Analysis FIA) consiste, dans son principe le plus simple, en l’injection d’un petit volume (µL) d’une solution échantillon dans un fluide en mouvement ; ce liquide transporteur, qui se déplace de façon continue, n’est pas segmenté, et la zone formée par l’injection répétée de l’échantillon est ainsi transportée vers un détecteur afin d’enregistrer les variations d’un paramètre physique ou physico-chimique caractéristique de l’échantillon ou, le plus souvent, de l’un de ses éléments constitutifs. Analyse quantitative (chimie) Chrome hexavalent Chrome trivalent Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Increasingly stringent environmental standards makes it necessary to determine chromium(VI) ion in chromium(III)-bearing samples. However, high concentrations of Cr3+ ion significantly interferes with the determination of trace amounts of Cr(VI). A simple flow-injection manifold, which has dual functions of adsorption and determination, was therefore developed to remove Cr(III) interference and to determine trace Cr(VI) automatically. Reverse adsorption tests were conducted by applying an adsorption column in the flow injection manifold for on-line removal of Cr3+ ion prior to determination. A new spherical cellulose adsorbent, SCAM-1, was used as the adsorption column filling. Tests of precision, recovery and linear range were also conducted to evaluate the above method. The results show that the variation coefficients are less than 4.0 % with recoveries ranging from 95.2 % to 104.8 %. Three calibration curves were obtained over the concentration range of 0.052 to 52.0 mg/L. The detection limit of the method developed for Cr(VI) ion is 0.009±0.0003 mg/L. Moreover, tolerable concentrations of co-existing Cr(III) can reach 312.0 g/L. Consequently, the manifold and the proposed method are ready for automatic on-line determination of trace Cr(VI) when present in large amounts of Cr(III). Note de contenu : - EXPERIMENTAL PROCEDURE : Reageants - Instruments and apparatus - Flow injection manifold - RESULTS AND DISCUSSION : Effect of the DPC reagent - Flow injection variables - Linear tests - Precision tests - Recovery tests - Detection limit - Comparison tests - Determination of Cr(VI) in chromium(III)-bearing samples - Table 1 : Properties of SCAM-1 - Table 2 : Operating conditions - Table 3 : Results of the statistical treatment performed on the pairs of data obtained by FIA - Table 4 : Results of precision tests - Table 5 : Recovery study of Cr(VI ) added to various samples - Table 6 : Analytical results of chromium(III )-bearing samples En ligne : https://drive.google.com/file/d/1TzqR4wGhw-ph34Ytgz9xgSuM71VmJ7AK/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40189 [article]

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Chromate (Cr6+)-free surface treatments for active corrosion protection of aluminum alloys: a review / Shri Shri Prakash in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 1 (01/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 1 (01/2024) . - p. 105-135 Titre : Chromate (Cr6+)-free surface treatments for active corrosion protection of aluminum alloys: a review Type de document : texte imprimé Auteurs : Shri Shri Prakash, Auteur ; J. N. Balaraju, Auteur Année de publication : 2024 Article en page(s) : p. 105-135 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aluminium -- Alliages Anticorrosifs Anticorrosion Chrome hexavalent Métaux -- Oxydation anodique Métaux -- Revêtements protecteurs Revêtement de conversion Sol-gel, Procédé Index. décimale : 667.9 Revêtements et enduits Résumé : For many decades, chromium and its derivatives have been the integral part in the corrosion protection of structural parts and have a wide application in the aircraft industry. It is used in the pre-treatment of aluminum substrate in the form of anodization or conversion coating and in the primer layer as a chromate additive. However, harmful impact of hexavalent chromium (Cr6+) compounds on the human health and the environment has triggered the need to find alternative corrosion protection measures. Finding an alternative to chromate is an arduous effort as chromates are known to provide a corrosion protection under extreme environmental conditions over a very wide range of pH. Active corrosion protection ability, commonly known as self-healing ability, is a hallmark of chromates. In a pursuit to realize an eco-friendly coating system, there are efforts worldwide to find alternatives both for primer component and for the pre-treatment process. This review focuses on work that has been carried out to replace Cr6+ in the pre-treatment process. Importance is given to those alternative pre-treatment processes that have the potential to provide active corrosion protection and possibly replace chromic acid-based anodization and conversion coatings. Note de contenu : - Introduction - Eco-friendly alternatives with active corrosion protection - Transition metal ions - Cerium-based solutions - Table 1 : Summary of the coating development and corrosion performance of the coatings with Cr3+-based sealing formulation - Table 2 : Summary of the coating development and corrosion performance of the coatings with transition metal ions added to anodizing bath - Table 3 : Summary of the coating development and corrosion performance of the coatings with transition metals added as a corrosion inhibitor to the sealing bath - Table 4 : Summary of the coating development and corrosion performance of the anodic coating with cerium as a corrosion inhibitor added to the sealing bath - Table 5 : Summary of the coating development and corrosion performance of the hybrid sol-gel coatings DOI : https://doi.org/10.1007/s11998-023-00831-1 En ligne : https://drive.google.com/file/d/1zoy-3zC6Ro32of8jMsyuV9AV3spMzcVq/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40438 [article]

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Chrome adsorption characteristics of Yue village soil fertilized with tannery sludge / Ding Shaolan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 98, N° 4 (07-08/2014)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 98, N° 4 (07-08/2014) . - p. 163-166 Titre : Chrome adsorption characteristics of Yue village soil fertilized with tannery sludge Type de document : texte imprimé Auteurs : Ding Shaolan, Auteur ; Dong Lingxiao, Auteur ; Pan Dong, Auteur Année de publication : 2014 Article en page(s) : p. 163-166 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adsorption Boues résiduaires Chrome hexavalent Chrome trivalent Déchets industriels -- Recyclage Déchets organiques -- Recyclage Tannage -- Déchets Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Tannery sludge used in agriculture contains much organic matter like a high-quality organic fertilizer. However, the excess chrome in tannery sludge limits its expanding use in agriculture. The absorption of chrome in different forms was studied in soil at different chrome concentrations and pHs. The research indicated that both Cr(III) and Cr(VI) were easily fixed by adsorption when they entered the soil. Adsorption of Cr(III) corresponded to Freundlich adsorption isothermal pattern, while that of Cr(VI) accorded with a Langmuir adsorption isothermal pattern. pH was the vital factor which effected the adsorption of Cr(III) and Cr(VI). Most of the chrome in tannery sludge would settle in the soil when it was used as a fertilizer in agriculture, because the chrome is mainly Cr(III). Note de contenu : - EXPERIMENTAL PROCEDURES : Materials and apparatus - Experiment - RESULTS AND DISCUSSION : Soil adsorption capacities of different chrome concentrations - Cr(III) and Cr(VI) adsorption isotherm in soil En ligne : https://drive.google.com/file/d/1Zysfx20C_LDXEkHxkVBEWlgYfjuNN4OR/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21816 [article]

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Chromium and leather : a review on the chemistry of relevance for allergic contact dermatitis to chromium in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 2 (Année 2020)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 2 (Année 2020) Titre : Chromium and leather : a review on the chemistry of relevance for allergic contact dermatitis to chromium Type de document : texte imprimé Année de publication : 2020 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Air -- Humidité Allergies Antioxydants Chrome hexavalent Chrome trivalent Dermatite de contact Eczéma professionnel Normalisation Spéciation (chimie) Toxicologie Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : As other causes decline in importance, chromium-tanned leather has become a more important source for chromium allergy, which affects around 1% of the general population. The aim of this review is to give suggestions on how to minimize the risk of leather-related allergic contact dermatitis, which can be elicited in chromium-allergic persons by hexavalent and trivalent chromium released from leather. Hexavalent chromium is the more potent chromium form and requires a lower skin dose to elicit allergic reactions. It is formed on the surface of some, antioxidant-free, leathers at dry conditions (< 35% relative humidity) and is influenced by the tanning process and other conditions, such as UV irradiation, contact with alkaline solutions, and leather age. Trivalent chromium is the dominant form released from chromium-tanned leather and its released amount is sufficient to elicit allergic reactions in some chromium-allergic individuals when they are exposed repetitively and over longer time (days – months). A low initial test result (< 3 mg/kg) for hexavalent chromium with the current standard test (ISO 17075) does not guarantee a low release of chromium from the leather or a low release of hexavalent chromium under typical exposure conditions during the service life of the leather. Information, labels, and certificates regarding leather products are often insufficient to protect chromium-allergic individuals. Correct labelling and information on the possible content of different allergens, as well as different tanning alternatives for certain leather products, are crucial. Note de contenu : - INTRODUCTION : Chromium speciation – toxicological considerations - Chromium tanning - Chromium allergy and allergic contact dermatitis (ACD) - Relevant chemical speciation of chromium for ACD - Prevalence of chromium allergy - Severity and persistence of chromium allergy and ACD - TRIVALENT VERSUS HEXAVALENT CHROMIUM FROM AN ALLERGIC PERSPECTIVE : Release of trivalent and hexavalent chromium from leather - Allergic reactions to trivalent and hexavalent chromium, and chromium-tanned leather - THE FORMATION OF HEXAVALENT CHROMIUM DURING USE OF CHROMIUM-TANNED LEATHER : Age of chromium-tanned leather article in use - Environmental factors during use of leather articles - OBSTACLES RELATED TO THE STANDARD TEST FOR HEXAVALENT CHROMIUM IN LEATHER (ISO 17075) - PRACTICAL IMPLICATIONS FOR CHROMIUM-ALLERGIC INDIVIDUALS AS CONSUMERS OF LEATHER PRODUCTS - ALTERNATIVES TO CHROMIUM-TANNING FROM AN ALLERGY PERSPECTIVE - Table 1 : Summary of selected data on the prevalence of chromium allergy in the general population and different clinical/occupational groups in different continents and countries. The data are merged for Europe, Asia, and North America. A detailed overview is given in the supplementary file, Table S - Table 2 : Most important tanning, leather, and exposure factors/conditions for the release of trivalent and hexavalent chromium from chromium-tanned leather DOI : https://doi.org/10.1186/s42825-020-00027-y En ligne : https://link.springer.com/content/pdf/10.1186/s42825-020-00027-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37453 [article]

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Comparative study of four different flavonoid compounds-containing plant extracts functionalised waste wool for accelerating aqueous chromium(VI) reductive removal / Jiayu Gu in COLORATION TECHNOLOGY, Vol. 138, N° 1 (02/2022)  

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Comparison of the inhibition efficiency of natural and synthetic phenolic antioxidants on Cr(VI) formation / Alper Kilikli in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 3 (03/2017)  

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Complete inhibition of hexavalent chromium formation from chrome-tanned leather with combined inhibitors / Koki Ogata in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 101, N° 1 (01-02/2017)  

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Consequences of banning chromium VI in leather articles / Catherine A. Money in LEATHER INTERNATIONAL, Vol. 214, N° 4825 (10/2012)  

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Contribution à la labellisation "écoproduit" de cuirs tannés aux sels de chrome : Etude de la mobilité du chrome / Richard Martinetti / 1994

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Cr(VI) Formation in double-face sheepskins : Effect of chromium level and ironing / Bahri Basaran in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 91, N° 1 (01-02/2007)  

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Le cuir / Thierry Poncet in CTC ENTREPRISES, (12/2019)  

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Determination of antioxidant properties of commonly used vegetable tannins and their effects on prevention of Cr(VI) formation / Cigdem Kilicarislan Ozkan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 99, N° 5 (09-10/2015)  

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Determination of chromium(VI) with bordeaux red by flow injection spectrophotometry in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 92, N° 3 (05-06/2008)  

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Determination of hexavalent chromium in leather by ion-exchange chromatography. Direct method versus post-column derivatisation method / Irene Compte in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 105, N° 4 (07-08/2021)  

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Determination of trace chromium (VI) ion chrome tanning agents by flow injection / Zhang Xinshen in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 84, N° 6 (11-12/2000)  

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Effect of some non functional surfactants and electrolytes on the hexavalent chromium reduction by glycerol : a mechanistic study / Ankita Basu in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 48, N° 6 (11-12/2011)

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Environmentally friendly Zn–Al layered double hydroxide (LDH)-based sol–gel corrosion protection coatings on AA 2024-T3 / R. Subasri in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)  

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Experimental study of emulsion liquid membrane separation of Cr (VI) using trioctylamine as the carrier / Ding Shaolan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 88, N° 4 (07-08/2004)  

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Experimental study of separating cr(VI) using a mixed carrier emulsion membrane / Ding Shaolan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 89, N° 3 (05-06/2005)  

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