Zn–Ni Electrophosphating on galvanized steel using cathodic and anodic electrochemical methods

Darband, Ghasem Barati; Afshar, Abdollah; Aliabadi, A.

doi:10.1016/j.surfcoat.2015.12.089

Cited by 18 publications

(16 citation statements)

References 20 publications

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“…There are two major electrochemical parameters that can be extracted from polarization curves, E corr (thermodynamic parameter) and i corr (kinetically parameter). These two parameters are helpful to analyze and compare the corrosion behavior of samples in a similar condition [2,3,16,52,53]. Based on Fig.…”

Section: Electrochemical Studymentioning

confidence: 99%

“…According to porosity values, porosity of the coating is decreased by adding nanoparticle, increasing the concentration of nanoparticle results in the porosity reduction and the lowest estimated porosity is for HZ 2 coating equal to 5% which is in accordance with FESEM observations. Of note is that generally a low value of coating porosity results in a better corrosion resistance [52], maybe this is another reason for increased electrochemical properties of composite coatings. Finally, the electrochemical study of synthesized coatings suggest that HA, HT and HZ coatings of this study show great corrosion resistance against simulated body fluid solution and protect the substrate.…”

Section: Electrochemical Studymentioning

confidence: 99%

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Synthesizing and comparing HA–TiO2 and HA–ZrO2 nanocomposite coatings on 316 stainless steel

Poorraeisi

Afshar

2019

SN Appl. Sci.

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In this research, hydroxyapatite coating and composite hydroxyapatite coatings containing nanoparticles were fabricated using a single step electrodeposition method. To investigate the effect of compositing agent type on hydroxyapatite structure, two different compounds (titania and zirconia) were used. Each compound was used at two different concentrations to observe the effect of compositing agent content on matrix structure. Pure hydroxyapatite was deposited with a water based Calcium-Phosphate (Ca-P) solution with pH = 4.2. To deposit composite coatings, a merged solution was prepared by merging CaP solution with aqueous TiO 2 (ZrO 2) suspension. Prepared coatings were analyzed using thickness measurement, XRD, FTIR, FESEM, polarization test and immersion in SBF solution. In the first step, XRD, FTIR and FESEM results proved the formation of hydroxyapatite using CaP solution and analysis of composite coatings proves the existence of nanoparticles in the coatings as compositing agent and the coating procedure was successful. Thereafter, polarization and immersion results indicate that composite coatings show superior properties than pure hydroxyapatite. The properties of hydroxyapatite matrix are influenced not only by the type of the compositing agent but also by the content of the additive. Adding nanoparticles changes different characteristics of pure HA, such as (1) decreasing the thickness of the coating, pure hydroxyapatite was 5.5 µm and the thickness of HA-ZrO 2 (ZrO 2 : 6 mM = HZ 2) composite coating was 4.4 µm; (2) increasing the crystallinity (Xc), Xc for HZ 2 coating is 86% and Xc for pure HA is 80%; (3) obvious changes in morphology has occurred and new morphologies of HA are observed which has not been mentioned in the literature previously; (4) composite coatings have more positive E corr than pure HA, E corr. of HZ 2 coating is − 0.23 which is the most positive one and E corr. of HA is − 0.41; (5) composite coatings have smaller porosity ratio than pure HA; (6) Pure and composite coatings are bioactive, but composite coatings show different bioactivity behavior.

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Section: Electrochemical Studymentioning

confidence: 99%

Section: Electrochemical Studymentioning

confidence: 99%

Synthesizing and comparing HA–TiO2 and HA–ZrO2 nanocomposite coatings on 316 stainless steel

Poorraeisi

Afshar

2019

SN Appl. Sci.

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“…It is reported that by adding nickel ions to coating bath, plate-shaped crystals are formed. 70 Phosphate coating morphology changes by the addition of niobium, ammonium oxalate and benzotriazole which is also observed in conventional chemical phosphating method. 75 The iron-manganese phosphate composite coating through cathodic electrochemical method revealed that the coating is dense and uniform, and the crystals of created coating are plane-shaped and diskshaped.…”

Section: Phosphate Coating Mechanism Formation Through Anodic Electromentioning

confidence: 77%

“…Other cations can also be used in the electrolyte to obtain di®erent phosphate composite coating. Barati et al 70 applied zinc-nickel phosphate composite coating on galvanized steel by employing cathodic electrochemical method and concluded that nickel and nickel phosphate with zinc phosphate are deposited on the surface of galvanized steel at the same time. Narayanan et al 59 has also created zinc-iron composite phosphate coating by using steel anode during the dissolution of the coating and releases iron ions.…”

Section: Phosphate Coating Formation Mechanism Via Cathodic Electrochmentioning

confidence: 99%

“…5 Generally, during cathodic electrochemical operations, the applied cathodic current will accelerate the coating formation and also the application of cathodic current prevents the dissolution of the substrate and forms a coating with high density and high uniformity. Barati et al 70 demonstrated that zinc-nickel phosphate composite coating generated via cathodic electrochemical reaction is dense and its crystals are in°ower-like and plate-like form. Flowerlike and plate-like crystals are a sign of Hopeite, reported by Jegannathan et al 63 and Kuwait et al 68 Figure 6 illustrates phosphate composite coating on aluminum substrates at various current densities.…”

Section: Phosphate Coating Mechanism Formation Through Anodic Electromentioning

confidence: 99%

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Electrochemical Phosphate Conversion Coatings: A Review

Darband

Aliofkhazraei

2017

Surf. Rev. Lett.

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Deposition of phosphate conversion coating using electrochemical methods have many advantages such as low phosphating temperature, low energy cost and good properties of fabricated coating and in recent times increasingly employed for deposition of phosphate coating. Deposition mechanism of coating which is fabricated using electrochemical methods is different from those obtained by conventional chemical methods, consequently, the properties of electrophosphate coating is also different from those conventional phosphate coating. In this paper, recent understanding of deposition mechanism of electrophosphate coating is reviewed. The microstructure, composition, thickness and corrosion behavior of electrophosphate coatings and effect of different factors of those properties were also reviewed.

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Characteristics of Zinc Phosphate Coating Activated by Different Concentrations of Nickel Acetate Solution

Abdalla

Hussain

Rahmat

et al. 2016

Metall Mater Trans A

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Zn–Ni Electrophosphating on galvanized steel using cathodic and anodic electrochemical methods

Cited by 18 publications

References 20 publications

Synthesizing and comparing HA–TiO2 and HA–ZrO2 nanocomposite coatings on 316 stainless steel

Synthesizing and comparing HA–TiO2 and HA–ZrO2 nanocomposite coatings on 316 stainless steel

Electrochemical Phosphate Conversion Coatings: A Review

Characteristics of Zinc Phosphate Coating Activated by Different Concentrations of Nickel Acetate Solution

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