Corrosion behavior of Cr electrodeposited from Cr(VI) and Cr(III)-baths using direct (DCD) and pulse electrodeposition (PED) techniques

Saravanan, Gengan; Mohan, S.

doi:10.1016/j.corsci.2008.10.005

Cited by 67 publications

(23 citation statements)

References 15 publications

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“…formic acid, glycine, urea, dimethyl formamide, sodium citrate, etc.) maybe used [6]. The Cr-C deposits could be obtained from trivalent chromium-base baths containing formic acid.…”

Section: Introductionmentioning

confidence: 99%

Characterization of as-deposited and annealed Cr–C alloy coatings produced from a trivalent chromium bath

Ghaziof¹,

Golozar²,

Raeissi³

2010

Journal of Alloys and Compounds

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“…formic acid, glycine, urea, dimethyl formamide, sodium citrate, etc.) maybe used [6]. The Cr-C deposits could be obtained from trivalent chromium-base baths containing formic acid.…”

Section: Introductionmentioning

confidence: 99%

Characterization of as-deposited and annealed Cr–C alloy coatings produced from a trivalent chromium bath

Ghaziof¹,

Golozar²,

Raeissi³

2010

Journal of Alloys and Compounds

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“…Time dependence of R f parameter is evident and can be seen it decreases after 24 hours. For all coatings resistance values are greater than observed for hexavalent chromium coatings in other works, which are of the order of 1x10 4 W cm2 [22]; this indicates to corrosion performance of coatings obtained with trivalent chromium is good with respect to traditional chromium plating.…”

Section: Thickness and Cathode Efficiencymentioning

confidence: 56%

“…Figure 7 shows the impedance spectra in the Bode representation for electrodeposited chromium, after one and twenty four hours immersed in 3% NaCl. The Nyquist impedance plots (not showed) form depressed semicircles, as observed in [22]. A high impedance modulus close to 1MW for the first hour at low frequencies for all experiments is a common feature of these coatings.…”

Section: Thickness and Cathode Efficiencymentioning

confidence: 70%

Corrosion Resistance of Decorative Chromium Films Obtained From Trivalent Chromium Solutions

Suárez

Olaya

Suárez

et al. 2012

J. Chil. Chem. Soc.

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In this work, the resistance to corrosion of chromium films obtained from trivalent chromium solutions of different compositions and the influence of solution compounds on the coatings electrochemical behavior and the microstructure were studied. The chromium coatings were obtained from trivalent solutions in a chloride-based bath with different complexing agents adding also sodium hypophosphite and aluminum chloride. UV-vis spectroscopy was carried out on all solutions before and after plating to observe changes in the chromium complexes chemical state due to the plating process. Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray (EDX) were performed to examine the coatings surface morphology and composition; respectively. The coulometric method was used for measuring coating thickness. Electrochemical impedance spectroscopy (EIS) was done using 3% NaCl as electrolyte and using a three-electrode cell with a standard calomel electrode (SCE) as reference. Bright chromium films were obtained from all baths however, differences were observed concerning morphology, thickness and corrosion resistance depending on the composition of the forming solution.Keywords: Trivalent chromium, plating, microstructure, corrosion resistance. [9,11] have studied the effect of the operating conditions such as the pH, temperature, current density and adding agents on the cathodic efficiency, morphology and structure of deposits, obtaining a response variable dependence in all cases.Other authors have reported the effect of reaction conditions during Cr +3 complexation in previous works [2][3], as well as the effect of sodium formate and acetate present in the solution on the chromium film morphology and corrosion resistance. In this work sodium hypophosphite and aluminum chloride were added to the basic formate and formate plus acetate baths to study the electrochemical behavior of the chromium films. Electrochemical impedance spectroscopy (EIS) was used to study the electrochemical behavior of the chromium coatings. The coating morphology and composition were studied by Scanning electron microscopy (SEM) and Energy dispersive X-ray (EDX) and films thickness was measured by the coulometric method [12] which also allow us to calculate the cathode efficiency. EXPERIMENTAL DETAILS Experimental designThe underlying goal of this study was to correlate chromium coating corrosion resistance to a set of factors such as: complexing, addition agents and time exposition to a corrosive environment. The Minitab software was used for designing and analyzing the experiments; Variance analysis (ANOVA) was used for analyzing the experimental results. The experimental order was randomized to ensure against the effect of time-related variables and also to satisfy statistical requirements independence of the observations. Each experiment was carried out with two replicates, until experiments were completed according to the design layout. ElectroplatingAll chemicals used were Sigma Aldrich reagent grade. Solutions were formulated wit...

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“…Pulse electrodeposition was done using Dynatronix (USA) DPR20-5-10 Model. The pulse parameters and formula used were given in our previous studies [18].…”

Section: Preparation Of Deep Eutectic Solvent and Electrochemical Depmentioning

confidence: 99%

Structure, composition and corrosion resistance studies of Co–Cr alloy electrodeposited from deep eutectic solvent (DES)

Saravanan

Mohan

2012

Journal of Alloys and Compounds

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Corrosion behavior of Cr electrodeposited from Cr(VI) and Cr(III)-baths using direct (DCD) and pulse electrodeposition (PED) techniques

Cited by 67 publications

References 15 publications

Characterization of as-deposited and annealed Cr–C alloy coatings produced from a trivalent chromium bath

Characterization of as-deposited and annealed Cr–C alloy coatings produced from a trivalent chromium bath

Corrosion Resistance of Decorative Chromium Films Obtained From Trivalent Chromium Solutions

Structure, composition and corrosion resistance studies of Co–Cr alloy electrodeposited from deep eutectic solvent (DES)

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