Influences of surface roughness on the water adsorption on austenitic stainless steel

Manaf, Noor Dalilah A; Fukuda, Kanao; Subhi, Zaid Ali; Radzi, Muhammad Faidhi Mohd

doi:10.1016/j.triboint.2019.03.014

Cited by 24 publications

(19 citation statements)

References 21 publications

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“…The control experiment with inert gas CH 4 /He shows no mixing effect with a constant amplitude ratio until 0.1 Hz, one order of magnitude higher than that for H 2 O/He control experiment. This may be explained by the different mixing effects from gases and vapors, also the response from mass spectrometry and adsorbed water on stainless steel surface 47 contributing to this result. Therefore, it is crucial to run control experiments under the same operating conditions using the same adsorbate for CSFR, similar to the control experiment required for volumetric‐swing FR where the type of adsorbents matter because of gas compression 48 .…”

Section: Resultsmentioning

confidence: 97%

Investigation of water kinetics in zeolite Linde‐Type‐A crystals by a concentration‐swing frequency response

2022

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A new concentration‐swing frequency response system was developed to evaluate water kinetics in non‐binder containing zeolite Linde Type A (LTA) crystals with frequencies up to 1 Hz. For commercial micron‐sized 3A crystals, the mass transfer rate is too fast to be determined accurately due to reduced sensitivity near the system limits. Larger LTA crystals (~15 μm) were synthesized in house and ion exchanged to three potassium concentrations (0, 48, and 77 wt%) to aid in the accurate determination of mass transfer mechanism and rates. Micropore diffusion with parallel sites, not a surface barrier, described all the data well, consistent with the bimodal distribution of crystal sizes from scanning electron microscope images. The transport diffusivity for water in zeolite 3A crystals near saturated loadings at 25°C is about 1 × 10−12 m2/s, 10 times slower than 4A crystals around 10−11 m2/s, both supporting fast micropore diffusion time constants >1 s−1 for micron‐sized crystals.

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Section: Resultsmentioning

confidence: 97%

Investigation of water kinetics in zeolite Linde‐Type‐A crystals by a concentration‐swing frequency response

2022

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“…After balls were set to the tester, air with controlled RH% was supplied at a flow rate of 2.5 L•min -1 for 60 min. to allow the amount of adsorbed water on the sample surfaces to saturated [11] before the scratching tests. The test for each material and each RH% condition was repeated 3 times with newly prepared specimens to confirm the repeatability of the test.…”

Section: Test Proceduresmentioning

confidence: 99%

“…It is obvious that μ(x) started to increase in the x < 0 and this is supposed to be due to severe adhesion, which takes place at metallic contact between balls. Since the amount of adsorbed water on the surface of SUS304 largely depends on RH% [10,11], the difference in the amount of water may influence the degree of adhesion between the balls and its duration. It is interesting that thick water layer equivalent to 60 nm on the smooth surface enhanced adhesion as shown in this study while that on rougher surface prevented severe adhesion as shown in the previous study [14].…”

Section: α(X) = -Cos -1 ((-X) ⁄ (2•r))mentioning

confidence: 99%

“…The amount of adsorbed water on the surface of austenitic stainless steel increases with the increase of the relative humidity (RH) of environmental atmosphere and reaches equivalent value to a water layer on the apparent surface area of the sample with a thickness of 60 nm [10]. The amount of adsorbed water increases with the increase in the surface roughness of the sample [11]. In the very early stage of the sliding of self-mated austenitic stainless steel shows an initial steady period (ISP) which does not show micron-level or larger adhesion phenomena and the length of ISP is shorter at medium RH than those at low or high RH [12,13].…”

Section: Introductionmentioning

confidence: 99%

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Tribological Behavior of Hydrophilic and Hydrophobic Surfaces in Atmosphere with Different Relative Humidity

2019

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The significant influences of atmospheric humidity on tribological phenomena are widely recognized. Although the influencing mechanisms of the humidity have been studied for a long time, many of the previous explanations remain in the qualitative estimation of mechanisms particularly from chemical effects viewpoint. In order to elucidate how the adsorbed water on a surface influences tribological phenomena, the current authors conducted ball to ball scratch tests for austenitic stainless steel (JIS SUS304) and proposed the mechanisms from a physical/mechanical viewpoint. A singular phenomenon was found; a lateral force, which can be regarded as a friction resistance, at a downhill motion showed significantly higher value than that at an uphill motion. The phenomenon was hypothesized to be influenced by Laplace pressure effect at a meniscus formed due to adsorbed water on the surface. In this study, polytetrafluoroethylene (PTFE) as the hydrophobic material was tested in comparison with SUS304 to show that the adsorbed water layer causes the singular phenomenon. PTFE successfully prevented the singular phenomenon while SUS304 reproduced it. The equilibrium analysis of the ball showed that adsorbed water contributed to the increase of the coefficient of kinetic friction but not of negative normal force at the contact point of SUS304.

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“…It is often a good predicting factor of the performance of mechanical components [9]. For instance, it influences the rate of water absorption in stainless steel [10] and lowers the quenching time of hot surfaces during cooling [11].…”

Section: Introductionmentioning

confidence: 99%

Development of Methodology for Characterization of Surface Roughness of Solid Metallic Surfaces Using Oil Slippage Method

Ohijeagbon

Adeleke

Ikubanni

et al. 2021

Latvian Journal of Physics and Technical Sciences

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The study employed the phenomenon of friction between liquid droplets and solid metallic surfaces in surface roughness analysis of engineering materials. Five samples of mild steel plate were prepared to different degrees of surface roughness by facing operation. The sample surfaces were analysed to determine the roughness parameters (mean roughness, root mean square roughness, roughness skewness, and roughness kurtosis) and friction coefficient of the surfaces. Oil droplet sliding velocity was determined using the oil slippage test. The friction coefficient of the surfaces increased with increasing roughness parameter which varied from 26.334 µm at friction coefficient = 0.63 to 13.153 µm at friction coefficient = 0.46. The results from oil slippage test showed that the sliding velocity of the oil drop decreased as the friction coefficient of samples increased. At an inclination angle of 30°, sliding velocity varied from 0.51 cm/s at friction coefficient = 0.63 to 0.92 cm/s at friction coefficient = 0.46. Some of the samples exhibited a deviation in the trend of relationship between friction coefficient and sliding velocity which resulted from the variation in peak height of roughness between the sample surfaces. Oil slippage method predicts the surface behaviours of materials based on their surface parameters.

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Influences of surface roughness on the water adsorption on austenitic stainless steel

Cited by 24 publications

References 21 publications

Investigation of water kinetics in zeolite Linde‐Type‐A crystals by a concentration‐swing frequency response

Investigation of water kinetics in zeolite Linde‐Type‐A crystals by a concentration‐swing frequency response

Tribological Behavior of Hydrophilic and Hydrophobic Surfaces in Atmosphere with Different Relative Humidity

Development of Methodology for Characterization of Surface Roughness of Solid Metallic Surfaces Using Oil Slippage Method

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