scholarly journals Tribological performance and corrosion behavior of CoCrMo alloy

2021 ◽  
Vol 16 (59) ◽  
pp. 129-140
Author(s):  
Hadda Rezzag ◽  
Latifa Kahloul ◽  
Hacène Chadli ◽  
Alima Mebrek ◽  
Adel Saoudi
Keyword(s):  
Corrosion Behavior ◽  
Positive Impact ◽  
X Ray Diffraction ◽  
Cocrmo Alloy ◽  
Electrochemical Tests ◽  
Powder Metallurgy Process ◽  
Lower Corrosion Rate ◽  
Hank’S Solution ◽  
Metallurgy Process ◽  
Cocrmo Alloys

The present work focuses on the Tribological properties and corrosion behavior evaluation of sintered CoCrMo alloy. The CoCrMo alloy was elaborated by Powder metallurgy process at various sintering temperatures (1200°C, 1250°C and 1300°C). The structural properties were characterized by X-ray diffraction and scanning electron microscopy. The tribological characteristics were measured using a dry disc-ball tribometer. The corrosion behavior of the samples was studied using different electrochemical tests in a simulated physiological environment (Hank’s solution). The obtained results show that higher sintering temperatures have a positive impact on the tribological behavior as well as the corrosion resistance of CoCrMo alloys. The sintered samples at 1300°C showed a better resistance to friction wear and a lower corrosion rate.

scholarly journals In Vitro Corrosion of Quaternery Magnesium Alloy Foam by Addition of Zinc

2020 ◽  
Vol 2 (3) ◽  
pp. 86-92
Author(s):  
Franciska Pramuji Lestari ◽  
Sofia Marta ◽  
Aprilia Erryan ◽  
Inti Mulyati ◽  
Ika Kartika
Keyword(s):  
Corrosion Rate ◽  
Raw Materials ◽  
Galvanic Corrosion ◽  
X Ray Diffraction ◽  
Corrosion Properties ◽  
Direct Observations ◽  
Powder Metallurgy Process ◽  
Electron Dispersion ◽  
Hank’S Solution

Magnesium alloys have been intensively studied as possible resorbable material with adequate mechanical properties similar to natural bones but very poor corrosion properties. In this analysis, the addition of Zn element to quaternary Mg-Ca-Zn alloy foam was evaluated with TiH2 as a foaming agent and manufactured with high-purity raw materials the powder metallurgy process. In Hank's solution, the rate of corrosion of specimens by direct observations with Scanning Electron Microscopy ( SEM), Electron Dispersion Spectrometry (EDS), static immersion studies, potentiodynamic evaluations, and X-Ray Diffraction (XRD). The specimens post-immersion characteristics and the corresponding Hank's solutions were examined at 2, 4, 6, 24, 48, and 72 hours of immersion. The findings show that the microstructure of alloy morphology, such as pores, pitting corrosion, needle shapes, and galvanic corrosion has the main corrosion products Mg(OH)2 and Ca10(PO4)6(OH)2. The addition of less than 6 percent wt Zn will minimize the corrosion rate but increase with 10 percent wt Zn. From this study, Mg-Zn-Ca alloy at 6 percent wt Zn has the lowest corrosion rate with slow pH changes in the process.

Corrosion Behavior of SiCp/6061 Al Metal Matrix Composites

CORROSION ◽  
1991 ◽  
Vol 47 (10) ◽  
pp. 741-753 ◽  
Author(s):  
H. Sun ◽  
E. Y. Koo ◽  
H. G. Wheat
Keyword(s):  
Metal Matrix Composites ◽  
Corrosion Behavior ◽  
Metal Matrix ◽  
Electrochemical Techniques ◽  
Microscopic Analysis ◽  
Matrix Composites ◽  
X Ray Diffraction ◽  
X Ray ◽  
Electrochemical Tests ◽  
Analysis Techniques

Abstract The corrosion behavior of silicon carbide/aluminum (SiCp/Al) metal matrix composites was studied in chloride solution by means of electrochemical techniques, scanning electron microscopy (SEM), Auger electron spectroscopy (AES), energy dispersive spectroscopy (EDS), and X-ray diffraction. The materials under investigation were powder metallurgy (P/M) processed 6061 Al reinforced with increasing amounts of SiC particles (15 to 40 vol%). Electrochemical tests such as potentiodynamic polarization were done in 0.035, 0.35, and 3.5% NaCl solutions that were open to air, aerated, or deaerated to observe overall corrosion behavior. In addition, pit morphology was observed after anodic polarization to a number of potentials. It was seen that the corrosion potentials did not vary greatly or show definite trends in relation to the amounts of SiCp reinforcement. However, the degree of corrosion increased with increasing SiCp content and the presence or absence of oxygen as well as the concentration of the NaCl solution did affect corrosion potentials. Microscopic analysis techniques were used to study the corroded samples and the extensive pitting and exfoliation of the surfaces. X-ray diffraction was used to identify the compounds on the surface of the corroded samples as well as the flakes due to exfoliation.

scholarly journals Surface Treatment of Zn-Mn-Mg Alloys by Micro-Arc Oxidation in Silicate-Based Solutions with Different NaF Concentrations

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4289
Author(s):  
Shineng Sun ◽  
Guo Ye ◽  
Ziting Lu ◽  
Yuming Weng ◽  
Guofeng Ma ◽  
...  
Keyword(s):  
Surface Treatment ◽  
Corrosion Behavior ◽  
Biomedical Applications ◽  
Electrochemical Impedance ◽  
Mg Alloys ◽  
X Ray Diffraction ◽  
Submicron Scale ◽  
Micro Arc Oxidation ◽  
Hank’S Solution ◽  
Zn Alloys

Newly developed Zn-Mn-Mg alloys can be invoked as biomedical materials because of their excellent mechanical properties. However, the corrosion behavior of Zn-Mn-Mg alloys was still lacking in research. It had grown to be a hot research topic to improve the corrosion behavior of Zn alloys by surface treatment to meet the application of degradable Zn alloys in biomedical applications. Micro arc oxidation (MAO) is a simple and effective method to improve the corrosion behavior of the alloy. MAO coatings were successfully prepared on the surface of Zn-Mn-Mg alloys by MAO in silicate-based solutions with different NaF concentrations. The microstructure and phase composition of MAO coatings prepared on Zn-Mn-Mg alloys with different NaF concentrations in the electrolyte was examined by a scanning electron microscope and X-ray diffraction. The results showed that the MAO coatings are porous and mainly composed of ZnO. With the increasing NaF concentration in the electrolyte, the average thickness increases. The distribution of the micro/nanopores was uniform, and the pore size ranged from the submicron scale to several micrometers after MAO treatment in the electrolyte containing different concentrations of NaF. Potential dynamic polarization curves and electrochemical impedance spectroscopy were employed to assess the corrosion behavior of MAO coatings in Hank’s solution. The highest corrosion rate can be achieved after MAO treatment, with an electrolyte concentration of 1.5 g/L NaF in Hank’s solution. These results indicated that MAO coating can accelerate the corrosion resistance of a Zn-Mn-Mg alloy.

Corrosion Behavior of Fe-Mn-C Alloy as Degradable Materials Candidate Fabricated via Powder Metallurgy Process

2012 ◽  
Vol 576 ◽  
pp. 386-389 ◽  
Author(s):  
Sri Harjanto ◽  
Yudha Pratesa ◽  
Bambang Suharno ◽  
Junaidi Syarif
Keyword(s):  
Mechanical Properties ◽  
Powder Metallurgy ◽  
Corrosion Rate ◽  
Corrosion Behavior ◽  
Austenite Phase ◽  
Coronary Stents ◽  
Powder Metallurgy Process ◽  
Degradable Biomaterials ◽  
Degradable Materials ◽  
Metallurgy Process

Fe-Mn alloys are prospective degradable materials for coronary stents. Several methods and strategies are investigated to produce excellence properties for this application, such as addition of alloying elements. The study is focused on the corrosion behavior of novel Fe-Mn alloys, i.e. Fe-25Mn-1C and Fe-35Mn-1C fabricated by powder metallurgy process. Addition of carbon is intended to obtain the phase that has ability to easily degradable without compromising its mechanical properties. The results show that austenite phase formed from this process and corrosion rate increased in proportion with the manganese addition from 32.2 mpy (Fe-25Mn-1C) to 43.7 mpy (Fe-35Mn-1C) using polarization methods. The presence of porosity, which cannot be extinguished by sintering, makes the degradation favorable. The results of this study indicate that these alloys have prospective properties to be applied as degradable biomaterials.

scholarly journals Corrosion Behavior of As-Cast Ti–10Mo–6Zr–4Sn–3Nb and Ti–6Al–4V in Hank’s Solution: A Comparison Investigation

Metals ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 11
Author(s):  
Jun Cheng ◽  
Jinshan Li ◽  
Sen Yu ◽  
Zhaoxin Du ◽  
Fuyu Dong ◽  
...  
Keyword(s):  
Corrosion Behavior ◽  
Current Density ◽  
Oxygen Vacancies ◽  
Corrosion Potential ◽  
Corrosion Current ◽  
X Ray Diffraction ◽  
X Ray ◽  
Biomedical Material ◽  
Passivation Current Density ◽  
Hank’S Solution

Newly developed Ti–10Mo–6Zr–4Sn–3Nb has fascinating mechanical properties to be used as a biomedical material. However, there is still a lack of investigation focusing on the corrosion behavior of Ti–10Mo–6Zr–4Sn–3Nb. In this work, the microstructure and corrosion behavior of as-cast Ti–10Mo–6Zr–4Sn–3Nb was investigated by optical microscopy, X-ray diffraction, and electrochemical measurements. Hank’s solution was used as the electrolyte. A classical as-cast Ti–6Al–4V was used as reference. The results showed that Ti–10Mo–6Zr–4Sn–3Nb has a higher corrosion potential and a lower corrosion current density compared with Ti–6Al–4V, indicating better corrosion resistance. However, after applying anodic potentials, Ti–10Mo–6Zr–4Sn–3Nb shows larger passivation current density in both potentiodynamic polarization and potentiostatic polarization tests. This is because more alloying elements contained in Ti–10Mo–6Zr–4Sn–3Nb trigger the production of a larger number of oxygen vacancies, resulting in a higher flux of oxygen vacancy. This finding illustrates that the passive film on Ti–10Mo–6Zr–4Sn–3Nb is less protective compared with that on Ti–6Al–4V when applying an anodic potential in their passivation range.

scholarly journals Microstructural Characterization of Borided Co-Cr-Mo Alloy

2021 ◽  
Vol 21 (4) ◽  
pp. 90-98
Author(s):  
Nazim Ucar ◽  
Can Gülüstan ◽  
Adnan Calik
Keyword(s):  
Microstructural Characterization ◽  
Boride Layer ◽  
Atmospheric Conditions ◽  
X Ray Diffraction ◽  
Cocrmo Alloy ◽  
Powder Composition ◽  
Boriding Process ◽  
Cocrmo Alloys ◽  
Electrical Resistance Furnace

Abstract This study involves the effect of boriding powder composition on the microstructure and hardness of a CoCrMo alloy borided in a solid medium using the powder pack method. To investigate the effect of boriding powder composition, two different commercial boriding agents, Ekabor-HM and Ekabor III, were thoroughly mixed with ferrosilicon powders to form the boriding media. The CoCrMo samples were tightly packed with the Ekabor-HM and Ekabor III boriding powders in stainless steel containers to minimize oxidation. The boriding process was carried out under atmospheric conditions for 9 h in an electrical resistance furnace preheated to 1223 K. X-ray diffraction (XRD) analyses revealed that the surfaces of the borided CoCrMo alloys consisted of a bilayer composed of CoB and Co2B phases and also contained minor amounts of CrB, Mo2B5, and Mo2B. The average thickness of the boride layer in the samples borided with Ekabor HM and Ekabor III powders was 28±4.1 μm and 21±2.3 μm, while the average hardness of the boride layer was 1752±5.3 HV0.1 and 1364±3.8 HV0.1, respectively.

Study on Microstructure and Corrosion Behavior of Ag-Cu-Zn-Ni Alloys

2011 ◽  
Vol 311-313 ◽  
pp. 2132-2137 ◽  
Author(s):  
Fu Xiang Huang ◽  
Ping Yin ◽  
Yong Hong Xu ◽  
Ying Zhang
Keyword(s):  
Corrosion Behavior ◽  
Energy Dispersive Spectrum ◽  
Second Phase ◽  
X Ray Diffraction ◽  
Silver Alloys ◽  
X Ray ◽  
Electrochemical Tests ◽  
Ni Alloys ◽  
Second Phases ◽  
Electronic Microscope

Potentiodynamic electrochemical tests and surface analysis technics, such as scanning electronic microscope (SEM), energy dispersive spectrum (EDS) and X-ray diffraction analysis (XRD), were applied to investigate the microstructure and corrosion behavior of Ag-Cu-Zn-Ni alloys in Na2S solution. The results reveal that the α-Ag phase is the main matrix of the studied silver alloys. The second phase of Ag-4Cu-0.3Ni and Ag-3Cu-Zn-0.3Ni/Ag-6Cu-Zn-0.3Ni are respectively CuNi and CuNi(Zn) phases. The second phases of Ag-6Cu-Zn-0.3Ni are well-distributed, which leads to an improvement in the corrosion resistance in Na2S solution.

scholarly journals Effect of Manganese on Microstructure and Corrosion Behavior of the Mg-3Al Alloys

Metals ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 460 ◽  
Author(s):  
Yao ◽  
Liu ◽  
Zeng ◽  
Li ◽  
Lei ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Behavior ◽  
Galvanic Corrosion ◽  
Intermetallic Phase ◽  
Localized Corrosion ◽  
Experimental Investigations ◽  
X Ray Diffraction ◽  
X Ray ◽  
Electrochemical Tests ◽  
Microstructure Observation

Microstructure and corrosion behavior of the Mg-3Al-xMn (x = 0, 0.12, 0.21, 0.36, 0.45) (hereafter in wt.%) alloys were experimentally investigated by electron probe microanalysis (EPMA), scanning electron microscope equipped with energy dispersive X-ray spectroscopy (SEM/EDX), X-ray diffraction (XRD), electrochemical, and hydrogen evolution tests. A new self-constructed Mg-Al-Mn-Fe thermodynamic database was used to predict the solidification paths of the alloys. The addition of Mn showed no grain refinement in the cast Mg-3Al alloys. According to the microstructure observation, Al-Fe phases were observed in the non-Mn-added alloy, while Al8Mn5(LT) (Al8Mn5 in low temperature) became the main intermetallic phase in the Mn-added alloys, and the amount increased gradually with the Mn addition. The τ–Al0.89Mn1.11 phase with lower Al/(Fe + Mn) ratio was observed in the alloys with 0.36 and 0.45 wt.% Mn content. According to the electrochemical tests, all five alloys showed localized corrosion characteristics in 3.5 wt.% NaCl solution. Compared with the Mg-3Al alloy, the corrosion resistance of Mn-added alloys were significantly improved and increased gradually with the Mn addition, which was due to the variation of Al-containing intermetallic compounds. The present experimental investigations and thermodynamic calculations confirmed the mechanism that the increasing amount of Al8Mn5(LT) with Mn addition could encapsulate the B2-Al(Mn,Fe) phase with higher Fe. Therefore, it could prevent this detrimental phase from contacting magnesium matrix, thus suppressing micro-galvanic corrosion and improving corrosion resistance gradually.

Ion Nitriding of CoCrMo Alloys

2010 ◽  
Vol 297-301 ◽  
pp. 82-87 ◽  
Author(s):  
Beril Kaya ◽  
Suat Yılmaz ◽  
Celaletdin Ergun
Keyword(s):  
Cross Sections ◽  
Hardness Profile ◽  
X Ray Diffraction ◽  
Ion Nitriding ◽  
Surface Layers ◽  
Cocrmo Alloy ◽  
X Ray ◽  
Hardness Tests ◽  
Nitrided Surface ◽  
Cocrmo Alloys

Medical grade cast CoCrMo alloy (F75) was ion nitrided under different process parameters including time (2, 9 hr) and temperature (600, 800 0C) at a gas mixture of 80%N2–20%H2. The nitrided surfaces were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). MicroVickers hardness tests were done on the cross sections of the nitrided specimens to investigate the hardness profile. The significant effects of nitriding temperature and time on the microstructure and hardness value of nitrided surface layers were displayed.

Effect of warm compaction and microwave sintering on the densification, tribological and electrochemical properties of TiC/316L composites

2012 ◽  
Vol 19 (3) ◽  
pp. 221-226
Author(s):  
Shaojiang Lin ◽  
Weihao Xiong ◽  
Shan Chen ◽  
Zhenhua Yao
Keyword(s):  
Wear Resistance ◽  
Corrosion Resistance ◽  
Powder Metallurgy ◽  
Microwave Sintering ◽  
X Ray Diffraction ◽  
Material Microstructure ◽  
Warm Compaction ◽  
Powder Metallurgy Process ◽  
Metallurgy Process ◽  
Wear Tests

AbstractIn this study, TiC/316L stainless steel composites were fabricated by combining warm compaction and microwave sintering (WMS). X-ray diffraction analysis was used to identify the phases in the material. Microstructure characteristics of composites were performed by means of scanning electron microscopy (SEM). Density, microhardness, wear resistance, and corrosion resistance were evaluated at room temperature. Results revealed that TiC/316L composites with higher relative density and finer properties can be obtained by WMS, compared with conventional powder metallurgy process. For all the tested species, the hardness of the composites prepared by WMS is higher than that of the composites prepared by conventional powder metallurgy (P/M). Wear tests showed that the WMS species exhibited significantly good wear resistance. Furthermore, it is found that the composites prepared by WMS were not only has high mechanical properties but also better corrosion resistance compared with the conventional P/M species.

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