Effect of Preadsorption of Organic Additives on the Appearance and Morphology of Electrogalvanized Steel Sheets

Nakano, Hiroaki; Ura, Takashi; Oue, Satoshi; Kobayashi, Shígeo

doi:10.2355/isijinternational.54.1653

Cited by 16 publications

(21 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The effect of the organic additives on the microstructure of the Zn deposit is related mainly com the formation of a more compact coating and more refined grains. This behavior is related to the adsorption of additives on the cathode surface during electrodeposition; the additives can retard grain growth and increase the nucleation rate, resulting in finer grain and compacts deposits [13][14][15][16][17]24 .…”

Section: Introductionmentioning

confidence: 99%

“…The organic additives initially preadsorbed on steel sheets successively adsorb onto the deposited Zn coating as well 24 . The adsorption of additives on the cathode surface during electrodeposition occurs through free electron containing radicals.…”

Section: Introductionmentioning

confidence: 99%

“…Hydrophilic groups (-O-SO 3 Na) act as radicals for adsorption of sodium lauryl sulfate. S act as radical for adsorption of thiourea 20,24 .…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Glycerol Effect on the Corrosion Resistance and Electrodeposition Conditions in a Zinc Electroplating Process

et al. 2019

View full text Add to dashboard Cite

Zinc electrodeposition is an economical process of Zn coating compared to conventional galvanic process. The galvanizing process is used in various industrial sectors to protect ferrous alloys during the corrosion process. In buildings, the galvanizing process is widely used to coat mortar protective screens. The electrodeposition of zinc has a relatively low cost compared to other coating materials for the same purpose; however, its corrosion resistance is lower than that of most protective deposits. This study evaluated the effect of adding glycerol to the electrodeposition bath on the corrosion resistance, deposition efficiency, morphology and microstructure of the zinc electrodeposit in concentrations ranging from 0.03 to 0.82 M. The electrodeposition was performed on carbon steel AISI 1020 with a current density of 10 mA.cm-2. The electroplating solution composition was 0.10 M ZnCl 2 , 2.80 M KCl and 0.32 M H 3 BO 3. Electrodeposition time was 17.56 min, 5 µm thick coating, equivalent to the mass of 7.166E-3 g of zinc on the steel surface. Evaluation of the corrosion resistance was performed by means of the electrochemical tests of Anodic Voltammetry, Potentiodynamic Polarization and Electrochemical Impedance Spectroscopy (EIS) as well as Weight Loss tests in NaCl 0.5 M in 4 (four) different period of immersion. The morphology and microstructures of electrodeposited were analyzed using the techniques of Scanning Electron Microscopy (SEM) and Spectrometry X-Ray Diffraction (XRD). The presence of glycerol in the electrodeposition bath decreased the deposition efficiency; however, it increased corrosion resistance and promoted the formation of more compact and refined electrodeposited coatings. Moreover, the results showed that the corrosion rate does not vary linearly with the addition of glycerol.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Glycerol Effect on the Corrosion Resistance and Electrodeposition Conditions in a Zinc Electroplating Process

et al. 2019

View full text Add to dashboard Cite

show abstract

“…It is important to control the crystal orientation of zinc as it affects the lightness, 1,2) glossiness, 1) surface roughness, 3,4) and press formability 4,5) of the electrogalvanized steel sheets. Therefore, there have been numerous studies regarding how the orientation is affected by electrolysis conditions, 3,[6][7][8][9] types of electrolytes, 10,11) addition of inorganic [12][13][14] and organic [15][16][17][18] compounds to the solutions, and preadsorption [19][20][21][22] of organic additives onto the iron substrate.…”

Section: Introductionmentioning

confidence: 99%

Effect of Surface Textures of Iron Substrate on the Crystal Orientation Relationship between Electrodeposited Zinc and Iron

et al. 2019

Self Cite

View full text Add to dashboard Cite

To investigate the effect of iron texture on the crystal orientation relationship between iron and zinc, Zn deposition was performed galvanostatically at 1 500 A/m 2 at a charge density of 1.48 × 10 4 C/m 2 onto high-purity electrolytic iron and cold rolled steel sheets in an agitated sulfate solution at 40°C. Fe with a large grain size showed an orientation relationship of {110}Fe//{0001}Zn. However, when the angle of inclination between the {110}Fe plane and the surface of electrolytic Fe was increased, the deviation in the orientation relationship {110}Fe//{0001}Zn increased. This result suggests that the orientation relationship of {110}Fe//{0001}Zn is difficult to maintain during the deposition when the inclination angle of the {110}Fe plane from the surface of electrolytic Fe increases. As a result, the epitaxial growth of Zn changes to random growth. Zn deposited on cold rolled steel sheets with a small grain size showed an orientation of {0001}, regardless of the orientation of Fe. This indicates that the orientation of the deposited Zn is more affected by the overpotential for deposition than by the orientation of steel sheets at the initial stage of deposition. Although strain was introduced into the high-purity electrolytic Fe with sandblasting, the orientation relationship of {110}Fe//{0001}Zn did not change remarkably, showing that the strain of Fe substrate has little effect on the orientation relationship between Fe and deposited Zn.

show abstract

“…The surface of the platelet crystals was smooth, similar to the morphology of Zn deposited from sulfate solution. 22) Because this deposit was composed of the intermetallic compound Fe 5 Zn 21 and single-phase Zn, the morphology seems to be close to that of deposited Zn.…”

Section: Structure Of the Deposited Znfe Alloysmentioning

confidence: 99%

Electrodeposition Behavior of Zn–Fe Alloy from Zincate Solution Containing Triethanolamine

et al. 2015

Self Cite

View full text Add to dashboard Cite

The electrodeposition behavior of ZnFe alloys has been investigated at 308 K at current densities of 10500 A·m ¹2 and a charge of 5 © 10 4 C·m ¹2 in an unagitated zincate solution containing triethanolamine, which forms a stable complex with Fe 2+ ions. The content of Fe in the deposit changed significantly depending on the current density. At current densities lower than 20 A·m ¹2 , the content of Fe was approximately 90 mass%, that is, the ZnFe alloy exhibited normal co-deposition, whereby the electrochemically more noble Fe deposited preferentially. At current densities higher than 100 A·m ¹2, however, anomalous co-deposition was observed, whereby the less noble Zn deposited preferentially. The current density at which the Fe content in the deposit changed significantly corresponded to that at which the cathode potential in the total polarization curve abruptly shifted to a less noble region than the equilibrium potential for Zn deposition. Iron deposition and H 2 evolution were significantly suppressed by the co-existence of Zn 2+ ions in the region of anomalous co-deposition at higher current densities, showing the formation of an inhibitor to deposition arising from Zn 2+ ions in the cathode layer. The current efficiency for alloy deposition was not close to zero even in the region of normal co-deposition, and the Fe content in the region of anomalous co-deposition was close to the composition reference line, which shows deposition behavior different from that in sulfate solutions. In the region of normal codeposition at lower current densities, underpotential deposition of Zn occurred with Fe. TEM analysis revealed that ZnFe alloys deposited at lower current densities comprised the stable intermetallic compound Fe 5 Zn 21 . The activity coefficient of Zn in the deposit appears to remarkably decrease because of this formation of stable Fe 5 Zn 21 .

show abstract

Effect of Preadsorption of Organic Additives on the Appearance and Morphology of Electrogalvanized Steel Sheets

Cited by 16 publications

References 19 publications

Glycerol Effect on the Corrosion Resistance and Electrodeposition Conditions in a Zinc Electroplating Process

Glycerol Effect on the Corrosion Resistance and Electrodeposition Conditions in a Zinc Electroplating Process

Effect of Surface Textures of Iron Substrate on the Crystal Orientation Relationship between Electrodeposited Zinc and Iron

Electrodeposition Behavior of Zn–Fe Alloy from Zincate Solution Containing Triethanolamine

Contact Info

Product

Resources

About

Effect of Preadsorption of Organic Additives on the Appearance and Morphology of Electrogalvanized Steel Sheets

Cited by 16 publications

References 19 publications

Glycerol Effect on the Corrosion Resistance and Electrodeposition Conditions in a Zinc Electroplating Process

Glycerol Effect on the Corrosion Resistance and Electrodeposition Conditions in a Zinc Electroplating Process

Effect of Surface Textures of Iron Substrate on the Crystal Orientation Relationship between Electrodeposited Zinc and Iron

Electrodeposition Behavior of Zn&ndash;Fe Alloy from Zincate Solution Containing Triethanolamine

Contact Info

Product

Resources

About

Electrodeposition Behavior of Zn–Fe Alloy from Zincate Solution Containing Triethanolamine