Effect of a nanoparticulate anti-friction coating on galling resistance of threaded oil-casing couplings

Zhao, Meng; Li, Yi; Yang, Yun; Xu, Zhijie; Shi, Bin; Shuqing, Zhao

doi:10.1016/j.petrol.2015.02.008

Cited by 16 publications

(6 citation statements)

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“…Meng et al [93] had performed numerous experiments and tried to validate the anti-friction, anti-wear and antigalling characteristics of NPAF coating, during which the NPAF coating material was prepared about 6 g of PTFE particles of diameter 591 nm and 15 g of Polyacrylic acid resin and then applied on manufactured buttress thread couplers and then tested for make-up torque as make-up torque is the function of the probability of galling in which higher the magnitude of make-up torque, the higher is the contingency of thread galling [30,91,[94][95][96][97][98][99]. After scrutinizing the data obtained by the after-experiment, they reported that there was a significant drop in the magnitude of make-up torque from 19,426 to 145,638 Nm i.e.…”

Section: Polytetrafluoroethylene (Ptfe)mentioning

confidence: 99%

“…The AFRICO coatings resulted . 9 Effect of augmenting concentration of PTFE of wear rate, friction coefficient, hardness and corrosion resistance [83] in decreased in the frictional value owing to the low frictional characteristics of PTFE [86,87] and the nano-copper particles present in the matrix acts as a ball bearing within the contact surface [93]. Meng et al [91] and Zhao [113] illustrated numerous galling test at varying makeup torque from 5790 to 13150 N on phosphate treated AFRICO surface as shown in Fig.…”

Section: Polytetrafluoroethylene (Ptfe)mentioning

confidence: 99%

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A review: advancements in fluoro-based polymers for aggrandizing anti-galling and wear resistant characteristics

2019

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Galling is the surface phenomenon which involves adhesion of local contact points and creation of protrusions on the juxtaposition of surfaces owing to high friction, inappropriate tribological loading, starved lubrication and high contact pressure (~ 1000 kPa). All these factors result in severe plastic deformation varying from 8000 to 10,000 µε (ε-strain) and diffusion of materials into one another, which consequently results in fatigue wear, surface roughness, tribocorrosion and seizing up of critical parts. The aim of the review is to analyze and summarizes the issue of galling, concurrently it also deals with the novel and economical mitigation method i.e. use of fluorine based coatings e.g. PTFE, owing to their lowest friction coefficient from 0.02 to 0.2 among other solids, high stiffness, high thermal stability and non-adherent characteristics that augments the mechanical and tribological properties and concurrently protect against hostile environments that eventually upsurges the life of components.

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Section: Polytetrafluoroethylene (Ptfe)mentioning

confidence: 99%

Section: Polytetrafluoroethylene (Ptfe)mentioning

confidence: 99%

A review: advancements in fluoro-based polymers for aggrandizing anti-galling and wear resistant characteristics

2019

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“…Epoxy coatings, in general, exhibit superior mechanical properties, chemical resistance, good electrical insulation properties and strong adhesion to heterogeneous substrates. Based on a low surface shear resistance and favorable friction characteristics they provide good anti-sticking and anti-galling properties [8]. Furthermore, they serve as an effective physical barrier between the metal and the aggressive environment containing Cl − , O 2 or H + and therefore improve the corrosion resistance and prolong the lifetime of metallic substrates.…”

Section: Introductionmentioning

confidence: 99%

Manipulation of TiO2 Nanoparticle/Polymer Coatings Wettability and Friction in Different Environments

et al. 2020

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An AISI 316L surface was functionalized by the adsorption of hydrophilic epoxy and epoxy/TiO2/epoxy coatings and hydrophobic epoxy/fluoroalkylsilane-functionalized FAS-TiO2/epoxy coatings. We characterized the coatings’ wettability, morphology and average surface roughness and discussed the influence of surface wettability and morphology on the coefficient of friction and the wear resistance. Experiments were performed in dry, distilled water and in a simulated physiological solution (Hank’s solution). In the case of dry sliding, a lower coefficient of friction is achieved for both TiO2 coatings compared to the pure epoxy coating. In a water environment the same level of friction is shown for all three coatings, whereas in Hank’s solution the friction is reduced for the hydrophilic epoxy/TiO2/epoxy coating, increased for the hydrophobic epoxy/FAS-TiO2/epoxy coating and has no effect on the pure epoxy coating. The results show that the corrosion resistance is significantly improved for the hydrophobic epoxy/FAS-TiO2/epoxy coating compared to the hydrophilic pure epoxy and epoxy/TiO2/epoxy coatings.

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“…Prevention of galling wear has long relied on the application of lubrication including oil and grease which act as a barrier between two sliding surfaces. Anti-seizure additives containing micro-size copper flakes, tin and graphite nanoparticles are commonly used in lubricants recommended for galling wear applications [7]. Nonetheless due to the high contact pressures which are often present in engineering systems, the lubricant can be squeezed out of the tribosystems allowing it to operate in dry metal/metal sliding conditions.…”

Section: Introductionmentioning

confidence: 99%

Galling resistance of nanostructured CVD tungsten/tungsten carbide coatings

Micallef¹,

Zhuk²,

Wood

2019

Surf. Topogr.: Metrol. Prop.

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Nanostructured tungsten/tungsten carbide (W/WC) coatings produced by chemical vapour deposition are promising WC based coatings for applications where galling wear is prevalent due to the high hardness, toughness and stacking fault energy which the coatings possess despite low hardness to elastic modulus ratio (H/E). In this work the galling resistance of W/WC coatings has been studied through tibometer tests using sliding speeds of 0.014 m s −1 and contact pressures of up to 810 MPa. The study investigates the effects of surface finish and the use of similar and dissimilar material combinations on galling wear. Results show that self-mated stainless steel AISI 316 behave poorly under dry sliding wear conditions whilst uncoated stainless steel tested versus W/WC coating combinations are affected by galling due to material transfer forming a stainless steel on stainless steel tribosystem. The best performance was recorded for self-mated W/WC which did not develop any signs of galling even at the highest contact pressures (810 MPa) contradicting the common practice that the use of dissimilar materials can help prevent galling.

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Effect of a nanoparticulate anti-friction coating on galling resistance of threaded oil-casing couplings

Cited by 16 publications

References 0 publications

A review: advancements in fluoro-based polymers for aggrandizing anti-galling and wear resistant characteristics

A review: advancements in fluoro-based polymers for aggrandizing anti-galling and wear resistant characteristics

Manipulation of TiO2 Nanoparticle/Polymer Coatings Wettability and Friction in Different Environments

Galling resistance of nanostructured CVD tungsten/tungsten carbide coatings

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