Effects of humidity on the sliding wear properties of Zn–Ni alloy coatings

Lee, L.; Behera, P.; Sriraman, K. R.; Chromik, Richard R.

doi:10.1039/c6ra27352a

Cited by 12 publications

(8 citation statements)

References 33 publications

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“…With increase in relative humidity, the amount of cadmium hydroxide phase increases considerably, leading to modification of the contact conditions. Tribological studies done by various authors [24,27,40] on the effect of relative humidity shows similar results, where a change in CoF was observed with modification of moisture content of the environment during the sliding wear test.…”

Section: Discussionsupporting

confidence: 62%

Friction transitions and connections to third bodies for a Cd coating on steel substrate

et al. 2020

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Cd coating is used in aerospace industries from last five decades due to its sacrificial protection and lubrication properties. Although Cd coating is primarily used due to its sacrificial corrosion protection when applied on steel substrate, the added benefit of modifying the tribological behavior by acting as a lubricious layer gives it a leading-edge than other coatings. Often the measurement of friction coefficient (CoF) is reported as a value generated after full sliding cycle. This measurement of average CoF generally limits the study of local variation in CoF occurring within one sliding cycle, which can be significantly different with change in spatial position due to change in third body morphology. In this study, a linearly reciprocating sliding test is used to measure the CoF at a sampling rate of 800 Hz along the track length to generate triboscopic image with steel countersphere. The instantaneous CoF obtained with triboscopy is correlated with the wear track morphology using scanning electron microscope (SEM) and optical profilometer for variation in contact conditions. Tribological test performed in dry atmosphere shows an average CoF of 0.4 till the end of the test whereas with increase in relative humidity to 60%, the average CoF changes from 0.4 to 0.8 at the end of the test due to change in contact conditions. Soft Cd coating on low carbon steel substrate is used to study these variations in third body morphology.

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Section: Discussionsupporting

confidence: 62%

Friction transitions and connections to third bodies for a Cd coating on steel substrate

et al. 2020

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“…Substantial material loss from the counterface is due to abrasive particles in the wear track. As humidity is high on the test performed, the formation of a prow, observed in a previous study [40], is hindered. Thus, the counterface and abrasive particles are not separated.…”

Section: Counterfacementioning

confidence: 71%

“…DOI:10.1016/j.wear.2017.12.018 have been reported to aid in reducing the CoF and wear rate [35,44,45]. However, when the normal load increases, the oxide layer begins to break down, as observed through the combination of optical images and Raman (Figure 12), and the velocity accommodation becomes adhesive in nature, which could occur where there is an absence of the oxide [21,40,43]. This mechanism is shown in Figure 16, where when a low normal load is used, such as 3.5 and 7 N, the tips of the asperities are flattened and a thin oxide layer is formed for both coatings during the run-in period.…”

Section: Effect Of Normal Load and Coating Morphology On The Wear And Velocity Accommodation Mechanismsmentioning

confidence: 99%

The effect of contact stress on the sliding wear behaviour of Zn-Ni electrodeposited coatings

Lee

Behera

Sriraman

et al. 2018

Wear

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Zinc-Nickel coatings, developed in the 1980's as a replacement for zinc coatings in the automotive industry, have recently gained interest in the aerospace industry to replace cadmium coatings. Due to different material properties of Zn-Ni and Cd, there is a need to characterize Zn-Ni for tribological applications. Sliding wear tests are performed on a reciprocating pin-on-flat tribometer using a steel counterface on two Zn-Ni coatings with different microstructure and surface topography. Tests were performed under 3, 7.5 and 12 N normal loads at a relative humidity of 60 % for 2000 cycles. Increasing the normal load increased the steady state friction coefficient and wear for both coatings. The smooth and dense coating was more sensitive to the change in normal load than the rough and porous coating, as the latter experienced less wear due to the columnar structure of the coating. In contrast, the smoother and dense coating, although has less wear at low loads, has more wear at high loads due to debonding of the coating. So the coating morphology affected the extent of wear due to different wear and velocity accommodation mechanisms.

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“…ZnNi-Mt coatings contained 86-90% Zn, 10-14% Ni with trace amounts of Mg and Al from Mt nanoparticles confirmed in ICP-MS analysis [48]. Throughout the studies, the coatings maintain the Ni% needed (8-18%) for maximized corrosion protection [57,59,70,83].…”

Section: Coating Compositionmentioning

confidence: 99%

Electrodeposited Zinc-Nickel Nanocomposite Coatings

Conrad¹,

Golden²

2019

Nanocomposites - Recent Evolutions

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Composite coatings can demonstrate improved property performance as compared to metals and alloy materials. One category of composite coatings is composed of metal or metal alloys with a dispersed phase of nonmetallic nanoparticles. The addition of these nanoparticles has been found to improve corrosion, wear resistance, and hardness. Producing metal composite coatings using electrochemical techniques can be advantageous due to reduced production cost, lower working temperatures, and precise control of experimental parameters. Metal coatings such as zinc have been successfully co-deposited with TiO 2 , SiO 2 , CeO 2 and mica particles and nickel has been co-deposited with a number of materials including TiO 2 , SiC, Al 2 O 3 , PTFE and silicates. Zinc-nickel alloys have long been studied for a number of properties, most notably corrosion resistance and recently their tribological properties. This chapter reviews the literature on electrodeposition of ZnNi nanocomposite coatings. Although there has been much work done on composite coatings, there is much less literature available on composite coatings with zinc-nickel alloys. So in this review, we look at the general trends for nanoparticle incorporation, deposition mechanisms, system stability, microstructures of the coatings and general corrosion trends.

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Effects of humidity on the sliding wear properties of Zn–Ni alloy coatings

Abstract: Formation of nanocrystalline ZnO film on sliding wear tracks at high humidity levels reduces the wear.

Cited by 12 publications

References 33 publications

Friction transitions and connections to third bodies for a Cd coating on steel substrate

Friction transitions and connections to third bodies for a Cd coating on steel substrate

The effect of contact stress on the sliding wear behaviour of Zn-Ni electrodeposited coatings

Electrodeposited Zinc-Nickel Nanocomposite Coatings

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