The Electrodeposition of Zinc Chromium Alloys and the Formation of Conversion Coatings without use of Chromate Solutions

Watson, Andy; Su, Yuanzhang; El‐Sharif, M.; Chisholm, C. U.

doi:10.1080/00202967.1993.11870976

Cited by 17 publications

(4 citation statements)

References 7 publications

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“…It is well known that amorphous metal, or metallic glass, is very difficult to fabricate using conventional manufacturing processes. Several researchers have found that amorphous Cr deposits can be obtained from a trivalent Cr bath containing complex agents such as urea and formic acid [11,13]. In contrast, the Cr deposit plated from a hexavalent Cr sulfate bath shows a crystalline structure [14].…”

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confidence: 99%

Characterization of Cr–Ni multilayers electroplated from a chromium(III)–nickel(II) bath using pulse current

et al. 2007

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confidence: 99%

Characterization of Cr–Ni multilayers electroplated from a chromium(III)–nickel(II) bath using pulse current

et al. 2007

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“…It is assumed that their buffering action suppresses the increase in pH near the cathode [14]. According to other authors the ammonium ions do not act as a buffer, but rather as ligands, thus affecting the acidity of the aqua-chromium (III) complexes [15]. Titration curves of electrolytes based on Cr(III) show that precipitation of chromium hydroxide does not occur up to a pH of about 6.…”

Section: Introductionmentioning

confidence: 98%

“…H 3 BO 3 is also a component of weakly acidic electrolytes for deposition of Zn coatings. According to Watson et al in electrolytes for Zn-Cr alloy deposition it plays the role of a ligand, which affects the acidity of the aqua-chromium complexes [15].…”

Section: Introductionmentioning

confidence: 99%

Deposition of Zn–Cr alloy coatings from sulfate electrolyte: effect of polypropylene glycol 620 and glycine and combinations thereof

et al. 2008

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The effect of polypropylene glycol with molecular mass 620 (PPG 620) and glycine as additives in electrodeposition of Zn-Cr alloy coatings from acidic sulfate electrolyte containing (NH 4 ) 2 SO 4 and H 3 BO 3 , at ambient temperature, without agitation is investigated. PPG 620 inhibits the Zn reaction causing significant proximity of the deposition potentials of Zn and Cr, and a co-deposition at a less negative potential of -1.8 V (vs. Hg/Hg 2 SO 4 ) as compared to the case when polyethylene glycol 1500 (PEG 1500) is used. Depending on the deposition conditions, alloy coatings containing up to 23 mass % Cr can be obtained. Glycine itself does not facilitate the co-deposition of Cr and Zn. Added to the electrolyte containing PPG 620, glycine causes a decrease of the Cr content in the alloy. However, the alloy coatings deposited in the presence of both additives are denser, have better overall appearance and good adherence to the steel substrate. Moreover, glycine increases the buffer capacity of the electrolyte. At short deposition times, the alloy coatings consist mainly of bcc C x -(Zn, Cr) phase with lattice parameter about 3.035 (3) Å and mean crystallite size of the order of 25 nm. Cr content in the coatings can be controlled by changing the concentration of Cr(III) and pH of the electrolyte as well as the current density. Depending on the working conditions, the cathode current efficiency is within 35-55%.

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“…Publications on researches on this subject are limited, fragmentary and incoherent, although literature references to the use of chromium-containing zinc alloys in industry can be found [1,2,[4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Zn-Cr Alloy Coatings: Electrodeposition and Properties

Osuchowska

Buczko

Olkowicz³

2021

Journal of KONBiN

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The electrodeposition process of Zn-Cr alloy coatings under the conditions of direct and pulsed current is discussed. The Cr content in the obtained alloy coatings, the current efficiency of the process, surface morphology, structure and wettability as a function of deposition parameters, such as current density, were determined. The Zn-Cr alloy coatings of good quality contained up to 20 wt.% Cr (for direct current) and up to 9 wt.% Cr (for pulse current). All the obtained coatings had a structure typical of zinc coatings (h.c.p.) and had a hydrophobic character. The morphology of the coatings changed significantly under the influence of changes in deposition conditions.

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The Electrodeposition of Zinc Chromium Alloys and the Formation of Conversion Coatings without use of Chromate Solutions

Cited by 17 publications

References 7 publications

Characterization of Cr–Ni multilayers electroplated from a chromium(III)–nickel(II) bath using pulse current

Characterization of Cr–Ni multilayers electroplated from a chromium(III)–nickel(II) bath using pulse current

Deposition of Zn–Cr alloy coatings from sulfate electrolyte: effect of polypropylene glycol 620 and glycine and combinations thereof

Zn-Cr Alloy Coatings: Electrodeposition and Properties

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