Effect of crystallographic orientation on the tribological behavior of electrodeposited Zn coatings

Sriraman, K. R.; Chromik, Richard R.; Yue, Stephen

doi:10.1039/c5ra15490a

Cited by 20 publications

(14 citation statements)

References 33 publications

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“…Differences in the peaks in the spectrums could be due to grain size or orientation of the grains. 32,33 Raman mapping was performed on the wear tracks through mapping the 550 cm À1 peak. The maps showed the presence of ZnO on the dark particles and the absence in the wear tracks for those obtained from RH 0% (Fig.…”

Section: Raman Spectroscopymentioning

confidence: 99%

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

et al. 2017

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Section: Raman Spectroscopymentioning

confidence: 99%

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

et al. 2017

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“…Chemical changes on the surface of the wear tracks were characterized using Raman spectroscopy (Figure 12). Peaks corresponding to zinc oxide (A1(LO), A1(TO), E2(high) and second order scattering bands of wurtzite [34][35][36][37]) were detected on the darker films and particles on the wear tracks in all cases. A high intensity and broad peak at the A1(LO) band observed could be related to the crystallographic orientation and microstructure of the zinc oxide layer due to sliding [34,35].…”

Section: Chemical Analysis Of Wear Trackmentioning

confidence: 99%

“…Peaks corresponding to zinc oxide (A1(LO), A1(TO), E2(high) and second order scattering bands of wurtzite [34][35][36][37]) were detected on the darker films and particles on the wear tracks in all cases. A high intensity and broad peak at the A1(LO) band observed could be related to the crystallographic orientation and microstructure of the zinc oxide layer due to sliding [34,35]. Through optical microscopy, higher ZnO film coverage was observed for the wear tracks obtained using lower normal loads compared to wear tracks from tests with higher normal loads, where the film is mostly broken up and partially removed.…”

Section: Chemical Analysis Of Wear Trackmentioning

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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“…Sacrificial Cd coating applied on aerospace materials is soft and acts as a lubricant [12], forming third bodies [3] at the contact region making it beneficial for its specific use. Though there have been recent work on metallic sliding [8][9][10][11][13][14][15][16], the dynamic nature of the third bodies formed at the interface is difficult to understand and correlate with the change in CoF occurring within one cycle of the test. Available literature for in situ tribometry method [17] used to study the evolution of third body morphology is mostly limited to transfer film and not frequently used to correlate the change in CoF when transfer film is not present.…”

Section: Introductionmentioning

confidence: 99%

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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Effect of crystallographic orientation on the tribological behavior of electrodeposited Zn coatings

Abstract: Tribo/transfer film evolution during sliding wear of steel contact on oriented Zn coatings.

Cited by 20 publications

References 33 publications

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

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

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

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

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