Characterization of the microstructure and texture of functionally graded nickel-Al2O3 nano composite coating produced by pulse deposition

Lajevardi, Seyed Ahmad; Shahrabi, T.; Szpunar, Jerzy A.; Rouhaghdam, A. Sabour; Sanjabi, S.

doi:10.1016/j.surfcoat.2013.06.111

Cited by 27 publications

(11 citation statements)

References 25 publications

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“…Gradual decrease in duty cycle led to higher nanoparticles in the coating surfaces according to refs. [31,49,50]. It has been shown in other research studies [17,31] that the duty cycle is inversely related to the percentage of nanoparticles in the coating which is confirmed by the obtained results.…”

Section: Microstructure and Chemical Composition Of The Coatingssupporting

confidence: 87%

“…Thereby, reducing the coating adhesion to the substrate results drop in some properties such as wear resistance [29,30]. To prevent this, researchers have suggested a functionally graded nanocomposite coating [30][31][32]. In fact, this coating is one of the functionally graded materials (FGM) with the concentration gradient of the alloy composition and the strengthener ceramic particles.…”

Section: Introductionmentioning

confidence: 99%

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Study on wear and corrosion properties of functionally graded nickel–cobalt– $$(\hbox {Al}_{2}\hbox {O}_{3})$$ ( Al 2 O 3 )

2019

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Functionally graded nickel-cobalt coatings with/without alumina nanoparticles were pulse electrodeposited on a carbon steel substrate by a continuous decrease in duty cycle from 95 to 10% at different frequencies of 100, 500 and 1000 Hz. The effect of pulse parameters on the nanoparticle content, chemical composition, microstructure, corrosion properties and tribological behaviour of coatings was studied. Energy-dispersive X-ray spectroscopy analysis showed that the amount of cobalt is gradually reduced and the content of alumina nanoparticles is increased from the substrate/coating interface to the surface. Based on the electrochemical studies in 3.5 wt% NaCl, the nanocomposite coatings gain the highest corrosion resistance at the lowest frequency. Also, the hardness of coatings gradually increased. Evaluation of the tribological behaviour of coatings by a pin-on-disk wear test showed that the nanoparticles have a positive effect on wear resistance and improve it by increasing frequency.

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Section: Microstructure and Chemical Composition Of The Coatingssupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Study on wear and corrosion properties of functionally graded nickel–cobalt– $$(\hbox {Al}_{2}\hbox {O}_{3})$$ ( Al 2 O 3 )

2019

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“…In the first step of applying FG coating, the first layer was applied with high duty cycle (88%) and in the final layer it was with low duty cycle (11%). This kind of duty cycle application has been adjusted according to the effect of pulse parameters reported previously [13,15], for more adsorption of particles in the coating surface and low fraction in the vicinity of the interface. In the second step, frequency alterations were used to change the volume fraction of particles and it was increased from 50 to 6400 Hz in eight steps.…”

Section: Methodsmentioning

confidence: 99%

“…Employing the capability of the PC, investigators have recently succeeded to apply functionally graded coatings (FG) from a bath by continuous reduction of duty cycle [12]. The decrease of duty cycle led to increase in volume fraction of nanoparticles in a metallic matrix of FG coating [13]. In this method, a layer with high duty cycle has been deposited first on the substrate surface, and duty cycle decreased in latter layers.…”

Section: Introductionmentioning

confidence: 99%

Ni–Fe–Al2O3 electrodeposited nanocomposite coating with functionally graded microstructure

2016

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In this study, a Ni-Fe-Al 2 O 3 nanocomposite coating was deposited on the substrate of low-carbon steel by electrodeposition from a sulphate-based bath. The effects of frequency and duty cycle were investigated to produce the functionally graded (FG) coating. For this purpose, first, the coatings with duty cycle-decreased method (DDM) were deposited in eight steps from 88 to 11%. At the second step, frequency-increased method (FIM) was utilized from 50 to 6400 Hz during eight steps. Assessing of coatings was carried out by scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), potentiodynamic test, Vickers microhardness test and wear test. Microstructure evaluations gained by SEM and EDS demonstrated that the continuous alterations of duty cycle contribute for manufacturing of FG coatings, so that the maximum particle fraction was in the free surface of the coating and its amount was gradually decreased to the interface. These investigations showed that FIM had no effect on production of graded structure. Corrosion and wear tests indicated high corrosion and wear resistance of DDM coatings in comparison to FIM coatings. Investigating the best coatings obtained from both above methods exhibited 50 and 20% reduction in corrosion current density and wear rate, respectively, for DDM specimen in comparison to FIM sample.

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“…Due to the constant chemical composition of matrix for these layers, identification of individual layer is difficult as there is no contrast among the layers. The variation of frequency may change the texture and grain size of deposited layers [28]. Increasing the frequency by enhancing the nucleation rate can reduce the grain size of deposits [29].…”

Section: Methodsmentioning

confidence: 99%

Ni–Fe–Mn–(nano)Al2O3 Coating with Modulated Composition and Grain Size

Torabinejad

Mahmood

Rouhaghdam

2016

Trans Indian Inst Met

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Composition modulated nanocomposite of NiFe-Mn-Al 2 O 3 coatings were fabricated on mild steel using single bath technique through alternative variation of duty cycle at constant frequency (VD) and repeated alteration of frequency at constant duty cycle (VF). The number of layers was 32 and thickness of each layer was 2.5 lm. The results of microstructure examination by SEM and EDS for VD coatings exhibited that Fe/Al 2 O 3 -rich layers adjacent to Mn rich ones were deposited in a frequent manner. In the case of VF coatings, alternative variation of frequency did not affect the chemical composition of matrix and only changed the content of embedded nanoparticles. The microhardness of Ni-Fe-Mn-Al 2 O 3 multilayers compared to monolithic and multilayer Ni-Fe-Al 2 O 3 of the same thickness was significantly increased because of Mn incorporation into the matrix. The corrosion resistance was found to be better for VD coating in comparison to the VF ones.

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Characterization of the microstructure and texture of functionally graded nickel-Al2O3 nano composite coating produced by pulse deposition

Cited by 27 publications

References 25 publications

Study on wear and corrosion properties of functionally graded nickel–cobalt– $$(\hbox {Al}_{2}\hbox {O}_{3})$$ ( Al 2 O 3 )

Study on wear and corrosion properties of functionally graded nickel–cobalt– $$(\hbox {Al}_{2}\hbox {O}_{3})$$ ( Al 2 O 3 )

Ni–Fe–Al2O3 electrodeposited nanocomposite coating with functionally graded microstructure

Ni–Fe–Mn–(nano)Al2O3 Coating with Modulated Composition and Grain Size

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