High-Purity Electrolytic Chromium

Ferrante, Margherita; Good, P. C.; Block, Frank E.; Yee, Danny

doi:10.1007/bf03378036

Cited by 2 publications

(1 citation statement)

References 4 publications

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“…Complex fluoride catalysts have the advantage of giving higher current efficiencies at higher temperature of operation, whereas sulfate-catalyzed baths decrease markedly in efficiency at higher temperature [86][87][88][89].…”

Section: Mixed Catalysts and Self-regulating Bathsmentioning

confidence: 99%

Electrodeposition of Chromium

Mandich¹,

Snyder²

2010

Modern Electroplating

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Electroplated chromium deposits rank among the most important plated metals and are used almost exclusively as the final deposit on parts. Without the physical properties offered by electroplated chromium deposits, the service life of most parts would be much shorter due to wear, corrosion, and the like. Parts would have to be replaced or repaired more frequently, or they would have to be made from more expensive materials, thus wasting valuable resources.The thickness of electroplated chromium deposits falls into two classifications: decorative and functional. Decorative deposits are usually under 0.80 mm in thickness. They offer a pleasing, reflective appearance while also providing corrosion resistance, lubricity, and durability. Decorative chromium deposits are typically plated over nickel but are occasionally plated directly over the substrate of the part.Functional ''hard chrome'' deposits have a thickness customarily greater than 0.80 mm and are used for industrial, not decorative, applications. In contrast to decorative deposits, functional chromium is usually plated directly on the substrate and only occasionally over other electrodeposits, such as nickel. Industrial coatings take advantage of the special properties of chromium, including resistance to heat, hardness, wear, corrosion, and erosion, and a low coefficient of friction. Even though it has nothing to do with performance, many users want their functional chromium deposits also to be decorative in appearance. Functional deposits are also used on parts such as cutting tools and strip steel and are even thinner than decorative deposits.The most common and oldest commercial type of chromium process utilizes hexavalent chromium (Cr 6 þ ) in an aqueous solution containing one or more catalysts. The

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Section: Mixed Catalysts and Self-regulating Bathsmentioning

confidence: 99%

Electrodeposition of Chromium

Mandich¹,

Snyder²

2010

Modern Electroplating

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Zur Gewinnung von hochreinem Chrommetall durch Elektrolyse wäßriger Chrom (VI)‐oxyd‐Lösungen

Rothmann

Keil

Richter

1964

Chemie Ingenieur Technik

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Sehr reines Chrom kann durch Elektrolyse wäßriger Chrom(VI)‐oxyd‐Lösungen erhalten werden. Versuche über den Einfluß von verschiedenen Fremd‐Ionen auf Ausbeute und Reinheit des Metalls und über weiter Arbeitsbedingungen — vor allem die Werkstoff‐Frage — für eine Dauerelektrolyse im kg‐Maßstab werden beschrieben. In Dauerelektrolysen über mehrere tausend Stunden konnten Chrom‐Platten mit 250 bis 500 ppm Sauerstoff, 10 ppm Stickstoff, 10 ppm Schwefel und weiteren metallischen Verunreinigungen, deren Gesamtmenge 10 ppm nicht überschreitet, hergestellt werden. Das Chrom enthält etwa 40 bis 60 ml Wasserstoff pro 100 g Metall und weist eine Vickershärte HV10 von 500 bis 600 kg/mm2 auf. Durch eine Vakuumbehandlung kann der Wasserstoff‐Gehalt auf 1 bis 3 ml/100 g Metall erniedrigt werden. Dabei vermindert sich die Vickershärte HV10 auf 150 kg/mm2. Aus Dendriten und zerkleinertem Metall lassen sich Preßkörper herstellen.

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High-Purity Electrolytic Chromium

Cited by 2 publications

References 4 publications

Electrodeposition of Chromium

Electrodeposition of Chromium

Zur Gewinnung von hochreinem Chrommetall durch Elektrolyse wäßriger Chrom (VI)‐oxyd‐Lösungen

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