CORROSION AND WEAR PROPERTIES OF ELECTRODEPOSITED TERTIARY NANOCOMPOSITE Zn–Ni (ALUMINA–YITTRIA–GERAPHENE) COATING

Nanocomposite Ni–Zn coatings containing 80 wt.% Al2O3, 5 wt.% Y2O3 and 15 wt.% graphene were fabricated by pulsed electrodeposition method in nickel–zinc sulphate-based electrolyte and effects of pulse current parameters on nickel and other element contents, microstructure, resistance to corrosion and tribological properties of the coatings were investigated. The pulsed current with duty cycle from 10% to 50% was applied to different samples and frequency changed gradually from 500 to 4000[Formula: see text]Hz in five steps during coating process. Increasing the duty cycle led to decrease of absorbed nanoparticles in the surface of the coatings from 4.4 vol% to 3.58 vol% The sample coated with 10% duty cycle had utmost alumina content in the coating surface, 3.5 vol% in first layer up to 4.4 vol% in fifth layer. The sample coated with 30% duty cycle had higher corrosion resistance with passive current density of 2.5[Formula: see text]mA/cm2. Furthermore, the results showed that by increasing the duty cycle, wear rate had been increased up to 1.3[Formula: see text][Formula: see text][Formula: see text]10[Formula: see text][Formula: see text]mm2/N[Formula: see text]m.

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Effect of the duty cycle of pulsed current on nanocomposite layers formed by pulsed electrodeposition

Rare Metals ◽

10.1007/s12598-010-0036-0 ◽

2010 ◽

Vol 29 (2) ◽

pp. 209-213 ◽

Cited By ~ 19

Author(s):

M. Aliofkhazraei ◽

Sh. Ahangarani ◽

A. Sabour Rouhaghdam

Keyword(s):

Duty Cycle ◽

Pulsed Current ◽

Pulsed Electrodeposition

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Influence of Pulse Current Forward-Reverse Duty Cycle on Structure and Performance of Electroplated W–Cu Composite Coatings

Materials ◽

10.3390/ma14051233 ◽

2021 ◽

Vol 14 (5) ◽

pp. 1233

Author(s):

Yuchao Zhao ◽

Nan Ye ◽

Haiou Zhuo ◽

Chaolong Wei ◽

Weiwei Zhou ◽

...

Keyword(s):

Composite Coating ◽

Duty Cycle ◽

Electrode Materials ◽

Pulse Current ◽

Electrical Discharge Machining ◽

Composite Coatings ◽

Electrical Contact ◽

Pulse Plating ◽

Fusion Welding ◽

Raw Material

Tungsten-copper (W–Cu) composites are widely used as electrical contact materials, resistance welding, electrical discharge machining (EDM), and plasma electrode materials due to their excellent arc erosion resistance, fusion welding resistance, high strength, and superior hardness. However, the traditional preparation methods pay little attention to the compactness and microstructural uniformity of W–Cu composites. Herein, W–Cu composite coatings are prepared by pulse electroplating using nano-W powder as raw material and the influence of forward-reverse duty cycle of pulse current on the structure and mechanical properties is systematically investigated. Moreover, the densification mechanism of the W–Cu composite coating is analyzed from the viewpoints of forward-pulse plating and reverse-pulse plating. At the current density (J) of 2 A/dm2, frequency (f) of 1500 Hz, forward duty cycle (df) of 40% and reverse duty cycle (dr) of 10%, the W–Cu composite coating rendered a uniform microstructure and compact structure, resulting in a hardness of 127 HV and electrical conductivity of 53.7 MS/m.

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The effects of dilution upon the corrosion and wear properties of cobalt-based weld overlays

Corrosion Science ◽

10.1016/0010-938x(93)90200-z ◽

1993 ◽

Vol 35 (1-4) ◽

pp. 647-653 ◽

Cited By ~ 5

Author(s):

P. Crook

Keyword(s):

Corrosion And Wear ◽

Wear Properties ◽

Weld Overlays

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Investigations on the microstructure, mechanical, corrosion and wear properties of Mg–9Al–xGd (0, 0.5, 1, and 2 wt%) alloys

Journal of Materials Research ◽

10.1557/jmr.2017.348 ◽

2017 ◽

Vol 32 (19) ◽

pp. 3732-3743

Author(s):

Karuna Ratnakaran Athul ◽

Amirthalingam Srinivasan ◽

Uma Thanu Subramonia Pillai

Keyword(s):

Corrosion And Wear ◽

Wear Properties ◽

Image Position

Abstract

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Pulsed-current duty cycle dependence of electromigration-induced stress generation in aluminum conductors

IEEE Electron Device Letters ◽

10.1109/55.491843 ◽

1996 ◽

Vol 17 (5) ◽

pp. 244-246 ◽

Cited By ~ 11

Author(s):

R. Frankovic ◽

G.H. Bernstein ◽

J.J. Clement

Keyword(s):

Duty Cycle ◽

Stress Generation ◽

Pulsed Current ◽

Induced Stress ◽

Cycle Dependence

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Anti-corrosion and wear properties of plasma electrolytic oxidation coating formed on high Si content Al alloy by sectionalized oxidation mode

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/167/1/012063 ◽

2017 ◽

Vol 167 ◽

pp. 012063 ◽

Cited By ~ 3

Author(s):

Libin Dai ◽

Wenfang Li ◽

Guoge Zhang ◽

Nianqing Fu ◽

Qi Duan

Keyword(s):

Plasma Electrolytic Oxidation ◽

Corrosion And Wear ◽

Al Alloy ◽

Wear Properties ◽

Plasma Electrolytic Oxidation Coating ◽

Electrolytic Oxidation ◽

Si Content ◽

Plasma Electrolytic

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Methodologies for Predicting the Performance of Ni-Cr-Mo Alloys Proposed for High Level Nuclear Waste Containers

MRS Proceedings ◽

10.1557/proc-556-879 ◽

1999 ◽

Vol 556 ◽

Cited By ~ 2

Author(s):

D. S. Dunn ◽

G. A. Cragnolino ◽

N. Sridhar

Keyword(s):

Nuclear Waste ◽

Current Density ◽

Localized Corrosion ◽

Passive Current Density ◽

Aqueous Corrosion ◽

Wide Range ◽

Anionic Species ◽

High Level Nuclear Waste ◽

High Level ◽

Passive Current

AbstractFor the geologic disposal of the high level nuclear waste (HLW), aqueous corrosion is considered to be the most important factor in the long-term performance of containers, which are the main components of the engineered barrier subsystem. Container life, in turn, is important to the overall performance of the repository system. The proposed container designs and materials have evolved to include multiple barriers and highly corrosion resistant Ni-Cr-Mo alloys, such as Alloys 625 and C-22. Calculations of container life require knowledge of the initiation time and growth rate of localized corrosion. In the absence of localized corrosion, the rate of general or uniform dissolution, given by the passive current density of these materials, is needed. The onset of localized corrosion may be predicted by using the repassivation and corrosion potentials of the candidate container materials in the range of expected repository environments. In initial corrosion tests, chloride was identified as the most detrimental anionic species to the performance of Ni-Cr-Mo alloys. Repassivation potential measurements for Alloys 825, 625, and C-22, conducted over a wide range of chloride concentrations and temperatures, are reported. In addition, steady state passive current density, which will determine the container lifetime in the absence of localized corrosion, was measured for Alloy C-22 under various environmental conditions.

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