Corrosion Behavior of Reverse-Pulse Electrodeposited Zn-Ni Alloys in Saline Environment

Boonyongmaneerat, Yuttanant; Saengkiettiyut, Kanokwan; Saenapitak, Sawalee; Sangsuk, Supin

doi:10.1007/s11665-013-0685-x

Cited by 8 publications

(4 citation statements)

References 17 publications

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“…Thus, increasing the T off at low γ compensates the reduction in Ni 2+ around the cathode and conditions for ion penetration on the cathode surface are obtained. As a result, the nickel amount in the deposit increases according to others [24,25]. The composition of F coatings is not effected by changing f (Figure 4).…”

Section: Microstructural Study and Composition Of Depositsmentioning

confidence: 90%

Study on functionally graded Zn–Ni–Al₂O₃ coatings fabricated by pulse-electrodeposition

Shourgeshty

Mahmood

Karimzadeh

2019

Surface Engineering

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Functionally graded Zn-Ni-Al 2 O 3 coatings were electroplated by continuously changing the duty cycle/frequency. Two types of graded coatings were deposited; the first type was synthesised through gradual reduction in the duty cycle from 88 to 11% at a certain frequency and the second type was plated by increasing the frequency gradually from 100 to 1500 Hz at a constant duty cycle. Microstructure and composition of coatings were determined by scanning electron microscope equipped with energy-dispersive spectroscopy. Corrosion behaviour was studied by potentiodynamic polarisation and electrochemical impedance spectroscopy (EIS); and tribological properties were evaluated using the pin-ondisc test. The results showed in the first type, Ni and alumina contents, and microhardness were increased towards the surface. But in the second type, composition was less affected through frequency alterations. Increasing the frequency raised the corrosion rate in the range of 2.9-8.7 μA cm −2 and improved the wear resistance.

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Section: Microstructural Study and Composition Of Depositsmentioning

confidence: 90%

Study on functionally graded Zn–Ni–Al₂O₃ coatings fabricated by pulse-electrodeposition

Shourgeshty

Mahmood

Karimzadeh

2019

Surface Engineering

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“…Thus, increasing the T off at low duty cycle compensates the reduction in Ni 2+ around the cathode and conditions for ion penetration on the cathode surface are obtained. As a result, the nickel amount in the deposit increases according to others [47,48].…”

Section: Microstructure and Chemical Composition Of The Coatingsmentioning

confidence: 94%

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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“…The results showed that the crystal grains of the alloy coatings prepared by DC, PC and PRC, respectively, became smaller and smaller in that order, and the coating surface became compacter and smoother correspondingly as shown in Figure 6. Using PRC, Boonyongmaneerat et al (2014) found that deposits with much higher nickel content are obtained by prolonging the dezincification period with increased pulse reverse duration. The challenge of the PC and PRC plating methods is low current efficiency of the processes besides uniform deposition of coatings (Müller et al, 2003).…”

Section: Pulse Electrodeposited Zn-ni Alloysmentioning

confidence: 99%

Recent work on electrochemical deposition of Zn-Ni (-X) alloys for corrosion protection of steel

Fashu

Khan

2019

ACMM

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Purpose Thin coatings are of great importance to minimize corrosion attack of steel in different environments. A review of recent work on electrodeposition and corrosion performance of Zn-Ni-based alloys for sacrificial corrosion protection of ferrous substrates is presented. The purpose of this study is to provide a systematic comparison of the corrosion resistances of Zn-Ni alloy coatings. The review contains key and outstanding comparisons of references for the period from 2007 to 2017. Binary and ternary Zn-Ni-based alloys were compared and contrasted to provide a good knowledge basis for selection of best coating system to steel substrates. Design/methodology/approach This article is a review article. Findings Zn-Ni-(X) alloys show great potential for replacing Cd metal in corrosion protection of steel substrates. Practical implications The research on plating of binary Zn-Ni alloys from aqueous electrolytes is now well advanced and these alloys show improved corrosion resistance compared to pure Zn. Pulse plated and compositionally modulated multilayer Zn-Ni alloy coatings showed enhanced corrosion properties compared to direct plated Zn-Ni coatings of similar composition. Originality/value The work on electrodeposition of Zn-Ni based alloys from ionic liquids is still scarce, yet these liquids show great promise in improving corrosion resistance and reducing coating thickness when compared to aqueous electrolytes. Advanced plating techniques in ionic liquids such as electromagnetic, compositionally modulated multilayer, pulse plating, ternary alloys and composites should be considered as these electrolytes avoid water chemistry and associated defects.

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Corrosion Behavior of Reverse-Pulse Electrodeposited Zn-Ni Alloys in Saline Environment

Cited by 8 publications

References 17 publications

Study on functionally graded Zn–Ni–Al₂O₃ coatings fabricated by pulse-electrodeposition

Study on functionally graded Zn–Ni–Al₂O₃ coatings fabricated by pulse-electrodeposition

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

Recent work on electrochemical deposition of Zn-Ni (-X) alloys for corrosion protection of steel

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Corrosion Behavior of Reverse-Pulse Electrodeposited Zn-Ni Alloys in Saline Environment

Cited by 8 publications

References 17 publications

Study on functionally graded Zn–Ni–Al2O3 coatings fabricated by pulse-electrodeposition

Study on functionally graded Zn–Ni–Al2O3 coatings fabricated by pulse-electrodeposition

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

Recent work on electrochemical deposition of Zn-Ni (-X) alloys for corrosion protection of steel

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Study on functionally graded Zn–Ni–Al₂O₃ coatings fabricated by pulse-electrodeposition

Study on functionally graded Zn–Ni–Al₂O₃ coatings fabricated by pulse-electrodeposition