scholarly journals Influence of Electrolyte Temperature on Morphology and Properties of Composite Anodic Film on Titanium Alloy Ti-10V-2Fe-3Al

Coatings ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1109
Author(s):  
Yulong Wu ◽  
Haisheng Wu ◽  
Liang Wu ◽  
Zhi-Hui Xie ◽  
Lei Liu ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Anodic Film ◽  
Electrolyte Temperature ◽  
Lubrication Mechanism ◽  
Anodic Films ◽  
Wear Rates ◽  
Electrochemical Tests ◽  
Low Wear ◽  
Ptfe Nanoparticles ◽  
Ball On Disc

In this study, we introduced a novel environmentally-friendly electrolyte consisting of polytetrafluoroethylene (PTFE) nanoparticles and malic acid solution to fabricate composite anodic film on Ti-10V-2Fe-3Al alloy at different electrolyte temperatures. The morphology revealed that the PTFE nanoparticles were successfully incorporated into composite anodic films and embedded preferentially in the pores and cracks. Their performances (wear, corrosion and hydrophobicity) were evaluated via electrochemical tests, ball on disc tests, and a contact angle (CA) meter. Compared to the substrate of titanium alloy Ti-10V-2Fe-3Al, the composite anodic films exhibited the low wear rates, high corrosion resistance and good hydrophobicity. However, the microstructure and morphology of the films were affected by the electrolyte temperature. As a result, their performances were changed greatly as a function of the temperature and the film fabricated at 20 °C exhibited better performances (CA = 131.95, icorr = 6.75 × 10−8 A·cm−2, friction coefficient = 0.14) than those at other electrolyte temperatures. In addition, the corresponding lubrication mechanism of the composite anodic films was discussed.

Fretting Behavior of Coated and Treated Titanium Alloy Using an Open-Loop System

2005 ◽  
Author(s):  
G. R. Yantio Njankeu ◽  
J.-Y. Paris ◽  
J. Denape ◽  
L. Pichon ◽  
J.-P. Rivie`re
Keyword(s):  
Titanium Alloy ◽  
Relative Motion ◽  
High Frequency ◽  
Open Loop ◽  
Loop System ◽  
Test Apparatus ◽  
Open Loop System ◽  
Wear Rates ◽  
Low Wear

Titanium alloys are well known to present poor sliding behaviour and high wear values. Various coatings and treatments have been tested to prevent such an occurrence under fretting conditions at high frequency of displacement (100 Hz). An original test apparatus, using an open-loop system instead of a classical imposed displacement simulator, has been performed to directly display the phenomenon of seizure, defined as the stopping of the relative motion between the contacting elements. A classification of the tested coatings has been proposed on the basis of their capacity to maintain full or partial sliding conditions, to present low wear rates and to prevent seizure.

Effect of Anodic Films on Galvanic Corrosion Behavior of TC4 Titanium Alloy and LY12 Aluminum Alloy

2014 ◽  
Vol 998-999 ◽  
pp. 39-42
Author(s):  
Zhi Yong Wu ◽  
Xue Yuan Li ◽  
Li Ning Zhao ◽  
Su Rong Hu
Keyword(s):  
Titanium Alloy ◽  
Aluminum Alloy ◽  
Corrosion Behavior ◽  
Galvanic Corrosion ◽  
Anodic Film ◽  
Corrosion Mechanism ◽  
Anodic Films ◽  
Galvanic Current ◽  
Corrosion Morphology ◽  
Tc4 Titanium Alloy

Galvanic corrosion behavior of TC4 titanium alloy coupled LY12 aluminum alloy was investigated in 3.5% NaCl solution. Particular attention was given to the effect of three different oxidation films. Galvanic corrosion test was conducted on TC4 titanium alloy which coupled LY12-sulfuric acid anodic film (LY12/A(S)), LY12-chromic acid anodic film (LY12/A(Cr)), LY12-hard anodic film (LY12/A(S) hd) and bare LY12, respectively. Galvanic corrosion current (Ig) and average galvanic current density (Ig’) were monitored. Corrosion morphology was observed by camera and corrosion mechanism was discussed. The results show that the three anodic films improve the corrosion resistance of the anode in different magnitudes. LY12/A(S) hd is found to be least susceptible to galvanic corrosion when coupled TC4 titanium alloy. LY12/A(S) and LY12/A(Cr) are found to be moderately susceptible to galvanic corrosion. But the bare LY12 is highly susceptible to galvanic corrosion in corrosive environment.

Mechanical instability and pore generation in anodic alumina

2006 ◽  
Vol 462 (2072) ◽  
pp. 2345-2358 ◽  
Author(s):  
S.J Garcia-Vergara ◽  
L Iglesias-Rubianes ◽  
C.E Blanco-Pinzon ◽  
P Skeldon ◽  
G.E Thompson ◽  
...  
Keyword(s):  
Pore Formation ◽  
Anodic Alumina ◽  
Anodic Film ◽  
Nuclear Reaction Analysis ◽  
Wall Region ◽  
High Plasticity ◽  
Mechanical Instability ◽  
Porous Films ◽  
Anodic Films ◽  
Growth Stresses

This paper examines the mechanism of pore formation in anodic films on aluminium. For this purpose, the dimensional changes of specimens during growth of porous films on aluminium in phosphoric and sulphuric acid electrolytes are examined using transmission and scanning electron microscopies. Further, the compositions of films and the efficiencies of anodizing are determined by Rutherford backscattering spectroscopy and nuclear reaction analysis. Significantly, the efficiency of anodizing is about 60%, while the surface of the anodic film is located above the original aluminium surface, i.e. before anodizing. The ratio of the thickness of the anodic film relative to the thickness of the consumed aluminium is about 1.35 for the selected conditions of anodizing. The behaviour runs counter to the widely accepted mechanism of pore formation by field-assisted dissolution of alumina. It is explained by the high plasticity of the anodic alumina in the barrier region in the presence of ionic transport, with film growth stresses displacing material from the barrier layer towards the cell wall region during anodizing. The response of the film to volume constraints on growth indicates a major role of stress and stress-relief processes in determining the morphology and self-regulating organization of pores.

Wear behavior of Fe-Cr-B alloys under dry sliding condition

2015 ◽  
Vol 67 (4) ◽  
pp. 336-343 ◽  
Author(s):  
Gongjun Cui ◽  
Jin Wei ◽  
Gongxiong Wu
Keyword(s):  
Design Methodology ◽  
Boron Content ◽  
Wear Behavior ◽  
Matrix Material ◽  
Dry Sliding ◽  
Content Type ◽  
Wear Rates ◽  
Mechanical Parts ◽  
Sic Ceramic ◽  
Ball On Disc

Purpose – The purpose of this study is to prepare new Fe-Cr-B alloys which have better wear resistance and investigate the wear mechanisms of these alloys tribotesting against SiC ceramic balls under dry sliding process. Design/methodology/approach – Fe-Cr matrix alloys were fabricated using powder metallurgy route. The tribological behaviors of Fe-Cr alloys tribotesting against SiC ceramic balls using a ball-on-disc tribotester were studied at different testing conditions. Meanwhile, microstructure, phases and morphology of worn surfaces were investigated. Findings – The element boron improved mechanical properties and tribological behavior of alloys. The friction coefficients of Fe-Cr matrix alloys did not show obvious difference. The specific wear rates of alloys decreased and then increased because of the brittleness of alloys with the increase of boron content. Fe-21 weight per cent Cr-7 weight per cent B alloy showed the best tribological properties in dry sliding. The wear mechanism of Fe-Cr alloy was plastic deformation and abrasive wear. However, the Fe-Cr-B alloys showed fatigue spalling characteristics. Originality/value – This paper reported a new, cheap and wear-resistant Fe matrix material to prepare mechanical parts in food and mining industrial fields.

Preparation and Tribological Property of Plasma Sprayed Adaptive Ni-Mo-Al-Ag-BN Composite Coating

2017 ◽  
Vol 739 ◽  
pp. 30-35
Author(s):  
Jian Liang Li ◽  
Hang Li ◽  
Dang Sheng Xiong ◽  
Yu Juan Ji ◽  
Yong Kun Qin
Keyword(s):  
High Temperature ◽  
Composite Coating ◽  
Tribological Property ◽  
Lubrication Mechanism ◽  
Wear Rates ◽  
Mechanism Model ◽  
Wide Range ◽  
Plasma Sprayed ◽  
Scanning Electron ◽  
Lubrication Mechanisms

In this paper an adaptive Ni-Mo-Al-Ag-BN composite coating was deposited by plasmaspraying. Its tribological property from 20°C-600°C were evaluated by using high temperature tribometer. Scanning electron microscopy and Raman spectroscopy were used to characterize the coating and corresponding wear tracks to determine the lubrication mechanisms. The result shows that the friction coefficient of the Ni-Mo-Al–Ag-BN composite coating from 200°C to 400°C is about 0.4 and declines very slightly at 600°C . The wear rates of the coating is 2.0×10-4mm3/N*m at 600°C and the downward trend is obvious compared with 400°C. Silver provide lubrication below 400 °C. Ag2MoO4 were formed with the temperature raised, and acted as high-temperature lubricants above 400 °C. Ni-Mo-Al–Ag-BN composite coating established a new lubrication mechanism model at 600°C . It can be concluded that the plasma sprayed Ni-Mo-Al - Ag - BN composite coating can keep good tribological property at wide range of temperature.

scholarly journals Corrosion and Wear performances analysis of PVD CrMoN/Cr Coatings

10.30544/640 ◽  
2021 ◽  
Vol 27 (3) ◽  
pp. 397-409
Author(s):  
Kheireddine BOUZID ◽  
Rim LAMARI ◽  
Nasser Eddine BELIARDOUH ◽  
Corrine NOUVEAU ◽  
Barnali Biswas
Keyword(s):  
Sliding Wear ◽  
Room Temperature ◽  
Corrosion Potential ◽  
Adhesive Wear ◽  
Uncoated Sample ◽  
Electrochemical Tests ◽  
Wear And Corrosion ◽  
Disc Configuration ◽  
Wear Tests ◽  
Ball On Disc

Tools coated CrN based alloys are currently used in several industries for machining and manufacturing, but present severe wear, limiting their service life. Seeking an alternative, three CrMoN monolayers (~1µm in thickness) coatings with varying in the Mo percentage content were elaborated using the RF magnetron co-sputtering method. These coatings were evaluated and compared with the alloy currently used (CrN) by electrochemical tests in NaCl solution (stationary and no stationary method) and sliding wear tests (ball-on-disc configuration) performed at room temperature. The results indicate that the samples coated with CrMoN presented better performance against wear and corrosion than the uncoated sample. Among the coatings, the labeled C1 (27 % Mo) showed the best corrosion resistance as it presents a positive corrosion potential Ecorr. However, the best wear resistance (lowest coefficient of friction) was shown by coating labeled C4 (33 % Mo). All of the tested specimens underwent abrasive wear in addition to adhesive wear.

scholarly journals Alumina-Toughened-Zirconia with Low Wear Rate in Ball-on-Flat Tribological Tests at Temperatures to 500 °C

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7646
Author(s):  
Marek Grabowy ◽  
Kamil Wojteczko ◽  
Agnieszka Wojteczko ◽  
Grzegorz Wiązania ◽  
Maciej Łuszcz ◽  
...  
Keyword(s):  
Wear Rate ◽  
Tetragonal Zirconia ◽  
Commercial Alumina ◽  
Strongly Connected ◽  
The Common ◽  
Low Wear ◽  
Zirconia Powders ◽  
Better Than ◽  
Sem Analyses ◽  
Ball On Disc

An alumina-toughened zirconia (ATZ) material, fabricated using a procedure consisting of the common sintering of two different zirconia powders, was tested using the ball-on-disc method in a temperature range between room temperature and 500 °C. Corundum balls were used as a counterpart. The ATZ composite behaviour during tests was compared with that of commonly used α-alumina and tetragonal zirconia sintered samples. At temperatures over 350 °C, a drastic decrease in the wear rate of the material was detected. SEM analyses proved that, in such conditions, nearly the whole surface of the sliding material was covered with a layer of deformed submicrometric grains, which limited contact with the part of material that was not deformed. The mentioned layer was relatively strongly connected with the material, increased its resistance, and decreased its coefficient of friction. As a reference, commonly used materials, namely commercial alumina and tetragonal zirconia, were tested. The wear parameters of the composite were significantly better than those registered for the materials prepared of commercial powders.

Load Scenarios Influence Fluid Absorption of Polyethylene

2005 ◽  
Author(s):  
T. Schwenke ◽  
C. Rieker ◽  
M. A. Wimmer
Keyword(s):  
Wear Testing ◽  
Fluid Absorption ◽  
Joint Replacements ◽  
Wear Rates ◽  
Total Joint Replacements ◽  
Fluid Uptake ◽  
Dynamically Loaded ◽  
Low Wear ◽  
Lubrication Conditions

Wear of total joint replacements is determined gravimetrically in simulator studies. A mix of bovine serum, distilled water, and additives is intended to replicate the lubrication conditions in-vivo. Weight gain due to fluid absorption during testing of UHMWPE components is corrected using a load soak station. In this study six sets of UHMWPE pins were tested for their fluid soak behavior. The samples were subjected to three different loading scenarios while being submersed in two types of commonly used lubricants. After two million cycles or 23.1 days, respectively, the different fluids lead to significantly different soaking results. Test groups that were dynamically loaded gained more weight than unloaded or statically loaded samples. The results suggest that dynamically loaded soak control stations are required during wear testing of UHMWPE components. Otherwise the fluid uptake masks the wear measurement, especially for new polyethylene materials with low wear rates. Furthermore, an agreement on detailed lubricant specifications is desirable.

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