Tribological behaviour and wear mechanisms of manganese phosphate coatings under dry reciprocating sliding contact conditions

Azhaarudeen, Saranya; Faruck, Azhaarudeen Anifa Mohamed; Nevosad, Andreas

doi:10.1016/j.triboint.2018.02.043

Cited by 29 publications

(7 citation statements)

References 19 publications

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“…In dry sliding conditions, no tribofilm is formed and complete hureaulite crystals are transferred. Furthermore, the system quickly wears through the phosphate coating and transitions to adhesive wear in line with previous investigators [ 11 ]. In lubricated conditions, a tribofilm readily forms for all base oils.…”

Section: Resultssupporting

confidence: 87%

“…However, in a casing connection and the metal-to-metal seal, the sliding lengths during assembly are short ( m) and the sliding velocities are low ( mm/s). Given the low total sliding distance, the phosphate coating and its associated generated tribofilms affect the wear process strongly [ 3 , 11 ]. The wear changes the surface topology of the metal-to-metal seal [ 12 ] and thus influences the subsequent seal ability [ 5 , 13 – 15 ].…”

Section: Introductionmentioning

confidence: 99%

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Characterization of the Adsorption Mechanism of Manganese Phosphate Conversion Coating Derived Tribofilms

et al. 2018

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Casing connections in the oil and gas industry are typically coated with zinc and/or manganese phosphate for corrosion protection during storage. The presence of phosphate coatings is also known to give beneficial tribological performance. The coating allows the system to run without problems long after it is worn off. This is because of two mechanisms. Glaze layer formation on the coated surface and, as will be shown, tribofilm formation on the uncoated counter-surface. An investigation into the mechanism behind this tribofilm formation is presented in this paper. The aim is to develop lubricants that exploit these mechanisms. A pin-on-disc set-up was used to investigate the interaction of a manganese phosphated disc and bare counter surface. Six base oils with different polarity and viscosity were used. The resulting tribofilms were analysed using optical microscopy, scanning electron microscopy, X-ray diffractometry, X-ray photoelectron spectroscopy, focused ion beam, and atomic force microscopy. The tribofilm is robust, amorphous, and only forms in the presence of a lubricant under sliding conditions and adsorbs on substrates with a large variation in chemical composition. It is concluded that the tribofilm consists of physisorbed manganese phosphate and formation is shear stress activated.

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Section: Resultssupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Characterization of the Adsorption Mechanism of Manganese Phosphate Conversion Coating Derived Tribofilms

et al. 2018

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“…The outer spherical surface of the inner ring and the inner spherical surface of the outer ring were covered with a layer of the Mn-P coating, the average thickness of which was ∼4 ± 0.3 μm. Because the Mn-P coating is a chemical conversion coating, 20 there will be local uneven thickness on the bearing surface. As shown in Figure 2, the Mn-P coating on the surface of the inner and outer rings of the bearing has a large grain size, primarily exhibiting an irregular polygonal cubic structure, and the arrangement was relatively compact, but there were also a few gaps.…”

Section: Test Bearingsmentioning

confidence: 99%

Research on damage and failure behaviour of coated self-lubricating spherical plain bearings based on detection of friction torque and temperature rise

Liu

Guo²,

Qin

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part J:

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In this study, the wear failure behaviour of coated self-lubricating spherical plain bearings under different working conditions in the light-load and low-frequency range was studied using a swing wear life tester. The commercial GE17ES bearing was the main research object, and the wear state of the bearing was monitored in real time using torque and temperature rise signals. Furthermore, a scanning electron microscope and an energy dispersive X-ray spectroscope were adopted to analyse the wear failure mechanism of bearings. The results indicated that the friction torque and temperature rise signal changes were mainly divided into three stages, and the characteristics of similar changes could be maintained under different working conditions. Furthermore, at the end of the bearing life, the torque and temperature rise had abrupt changes almost at the same time, which indicated the occurrence of bearing failure. In general, the wear failure mechanisms of bearings included abrasive wear and adhesive wear. Moreover, fatigue wear and oxidation wear were under some conditions. The torque and temperature rise comprehensively reflected the service state of coated self-lubricating spherical plain bearings, which could be used as a physical criterion for determining bearing failure. These results had a strong prospect of engineering application, and were expected to provide a reference for determining the failure behaviour of multi-type coated self-lubricating spherical plain bearings in the future, and provided theoretical support for establishing relevant test standards.

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“…However, the effect of substrate texturing, before MnP coating, on friction and wear properties, under a MnP containing tribo-system, is not well known. Most apparatuses and running conditions are categorized as either reciprocating/ oscillating [1,7,9,10], block-on-ring [5], or pin-on-disk [3,4], under pure sliding mode when the fundamental evaluations of MnP tribological performances (e.g., friction, wear, and seizure) are carried out using tribometers. Few fundamental and detailed reports exist on tribological performance and rollingsliding contact fatigue, e.g., pitting, a representative mode in steel gear failures coated with MnP.…”

Section: Introductionmentioning

confidence: 99%

Influence of Wear Surface Morphology and Phosphorus-Containing Tribofilm on Crack Initiation of Manganese Phosphate Coated Steel under Rolling–Sliding Contact

et al. 2020

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To improve the rolling-sliding contact fatigue strength of a case-carburized steel, the effect of the wear surface morphologies of manganese phosphate (MnP) coated steel and the growth and removal of phosphorus-containing tribofilm on surface-initiated crack formation was investigated. In order to modify the wear surface morphologies, two types of surface textures (ground and shot blasted) were prepared, followed by the MnP coating process. The tribological properties of the coated steel, tribofilm growth and removal, and surface-initiated crack formation were evaluated using a ball-on-disk tribometer with a rolling-sliding mode. The MnP coating on both the ground and shot blasted steel had nearly the same thickness and surface roughness. However, for the ground surface sample, the interface morphology between the coating and steel substrate was more irregular than the shot blasted surface sample, resulting in a larger number of exposed steel areas with smaller sizes after the MnP was almost worn away on tribological tests. During the runningin period, phosphorus-containing tribofilm growth and removal on the smaller exposed steel areas were observed. The surface-initiated crack formation on the smaller exposed steel areas was suppressed compared with larger exposed steel areas.

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Tribological behaviour and wear mechanisms of manganese phosphate coatings under dry reciprocating sliding contact conditions

Cited by 29 publications

References 19 publications

Characterization of the Adsorption Mechanism of Manganese Phosphate Conversion Coating Derived Tribofilms

Characterization of the Adsorption Mechanism of Manganese Phosphate Conversion Coating Derived Tribofilms

Research on damage and failure behaviour of coated self-lubricating spherical plain bearings based on detection of friction torque and temperature rise

Influence of Wear Surface Morphology and Phosphorus-Containing Tribofilm on Crack Initiation of Manganese Phosphate Coated Steel under Rolling–Sliding Contact

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