Investigation in the Influence of Surface Treatment on Mechanical and Electrochemical Corrosion Properties of Ti-6Al-4V Alloy

2017 ◽  
Vol 893 ◽  
pp. 350-353 ◽  
Author(s):  
Zhe Rui Huang ◽  
Yu Lin Li ◽  
Qing Dong Zhong ◽  
Chen Xiao ◽  
Hui Li ◽  
...  
Keyword(s):  
Mechanical Property ◽  
Corrosion Resistance ◽  
Titanium Alloy ◽  
Surface Treatment ◽  
Electrochemical Corrosion ◽  
Compound Layer ◽  
Cell Reaction ◽  
Corrosion Properties ◽  
Layer Sample ◽  
Two Phases

Potential difference between two phases in the Ti-6Al-4V alloy results in the galvanic cell reaction and corrosion. In order to improve the properties of Ti-6Al-4V, it was treated under different temperature with the atmosphere of 5vol. % oxygen and 95 vol. % nitrogen. The results showed that the titanium alloy surface is formed a layer of oxide and nitride compound layer. Sample treated at the temperature of 800°C had the most outstanding corrosion resistance and mechanical property.

scholarly journals Effect of combined surface treatment on quality and electrochemical corrosion properties of manganese phosphate on hsla steel domex 700

2018 ◽  
Vol 62 (2) ◽  
pp. 45-53 ◽  
Author(s):  
Kamil Borko ◽  
F. Pastorek ◽  
Jacková M. Neslušan ◽  
S. Fintová ◽  
B. Hadzima
Keyword(s):  
Corrosion Resistance ◽  
Surface Treatment ◽  
Electrochemical Impedance ◽  
Hsla Steel ◽  
Electrochemical Corrosion ◽  
High Strength Steels ◽  
High Strength ◽  
Corrosion Properties ◽  
Manganese Phosphate ◽  
Pre Treatment

Abstract The actual industrial trend is focused on weight reduction of constructions while preserving strength properties. For this purpose, conventional steel are replaced by high strength steels.. The aim of this study was to evaluate the effects of mechanical surface pre-treatment on corrosion resistance of high strength low alloy steel Domex 700 before and after surface treatment by manganese phosphating. Tested environment was 0,1M NaCl solution. Evaluation of mechanical pre-treatment and phosphating effects on corrosion resistance was realized by electrochemical measurements: potentiodynamic polarization measurements (Tafel analysis) and electrochemical impedance spectroscopy (equivalent circuits). From resulsts it is possible to conclude, that creation of manganese phosphate layer on ground and shot peened steel surface significantly increases the corrosion resistance of Domex 700 steel.

Titanium Alloy Ti6Al4V’s Corrosion Resistance Behavior by Double Glow Discharge Plasma Hydrogen-Free Carburizing Process

2008 ◽  
Vol 47-50 ◽  
pp. 1197-1200
Author(s):  
Gao Hui Zhang ◽  
Ping Ze Zhang ◽  
Ming Zhou Yu ◽  
Zhong Xu
Keyword(s):  
Corrosion Resistance ◽  
Titanium Alloy ◽  
Glow Discharge ◽  
High Purity ◽  
Discharge Plasma ◽  
Pure Titanium ◽  
Surface Hardness ◽  
Electrochemical Corrosion ◽  
Glow Discharge Plasma ◽  
Corrosion Properties

The surface-modified Titanium alloy Ti6Al4V was obtained in the process of the double glow discharge plasma hydrogen-free carburizing. The high purity solid graphite as the source cathode supplied the carbon elements; pure titanium and its alloys were used as the cathode and argon as the working gas. At certain pressure and voltage, the glow discharge appeared between cathode and anode, source cathode and anode. The carbon plasma flux, including carbon atoms, ions, sputtered by argon ions diffused into the substrate, which depended on ions bombardment and thermal diffusion at a negative voltage. High purity solid graphite cathode was done in a honeycomb shape or grid shape. A layer with TiC and C phases was formed during the process. Surface hardness was increased by four times due to the presence of TiC and C phases, and wear resistance was enormously improved. The C concentration and hardness of alloying layer changed gradually with the depth. The corrosion properties of hydrogen-free carburized specimens were tested in the solution of 5% NaCl and 5% H2SO4, using electrochemical corrosion method. The results showed that the corrosion resistance of carburized specimens was significantly improved in 5% H2SO4 solution.

TITANIUM 1Al-8V-5Fe

Alloy Digest ◽  
1968 ◽  
Vol 17 (2) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Titanium Alloy ◽  
High Temperature ◽  
Physical Properties ◽  
Surface Treatment ◽  
Tensile Properties ◽  
Heat Treating ◽  
Temperature Performance ◽  
Reactive Metals

Abstract Titanium IA1-8V-5Fe is an all beta type titanium alloy recommended for high temperature fasteners. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as creep and fatigue. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Ti-55. Producer or source: Reactive Metals Corporation.

Ti-140A

Alloy Digest ◽  
1962 ◽  
Vol 11 (1) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Titanium Alloy ◽  
Shear Strength ◽  
High Temperature ◽  
Physical Properties ◽  
Surface Treatment ◽  
Tensile Properties ◽  
Heat Treating ◽  
Temperature Performance ◽  
Iron Chromium

Abstract Ti-104A is a titanium alloy containing about 2% each of iron, chromium and molybdenum. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and shear strength. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Ti-5. Producer or source: Titanium Metals Corporation of America. Originally published July 1954, revised January 1962.

scholarly journals Effect of Plasma Nitriding Process Conditions on Corrosion Resistance of 440B Martensitic Stainless Steel

2014 ◽  
Vol 8 (3) ◽  
pp. 156-159 ◽  
Author(s):  
Magdalena Łępicka ◽  
Małgorzata Grądzka-Dahlke
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Degradation Products ◽  
Plasma Nitriding ◽  
Electrochemical Corrosion ◽  
Industrial Applications ◽  
Process Conditions ◽  
Corrosion Properties ◽  
Dental Instruments ◽  
Increased Risk

Abstract Martensitic stainless steels are used in a large number of various industrial applications, e.g. molds for plastic injections and glass moldings, automotive components, cutting tools, surgical and dental instruments. The improvement of their tribological and corrosion properties is a problem of high interest especially in medical applications, where patient safety becomes a priority. The paper covers findings from plasma nitrided AISI 440B (PN-EN or DIN X90CrMoV18) stainless steel corrosion resistance studies. Conventionally heat treated and plasma nitrided in N2:H2 reaction gas mixture (50:50, 65:35 and 80:20, respectively) in two different temperature ranges (380 or 450°C) specimens groups were examined. Microscopic observations and electrochemical corrosion tests were performed using a variety of analytical techniques. As obtained findings show, plasma nitriding of AISI 440B stainless steel, regardless of the process temperature, results in reduction of corrosion current density. Nevertheless, applying thermo-chemical process which requires exceeding temperature of about 400°C is not recommended due to increased risk of steel sensitization to intergranular and stress corrosion. According to the results, material ion nitrided in 450°C underwent leaching corrosion processes, which led to significant disproportion in chemical composition of the corroded and corrosion-free areas. The authors suggest further research into corrosion process of plasma nitrided materials and its degradation products.

scholarly journals nvestigation of Morphology of Ti-6Al-7Nb after sulphuric anodizing

10.18048/5306 ◽  
2017 ◽  
Vol 53 (1) ◽  
pp. 85-91
Author(s):  
Momchil Manov
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Titanium Alloy ◽  
Structural Analysis ◽  
Quality Assessment ◽  
Surface Treatment ◽  
Xrd Analysis ◽  
Unique Combination ◽  
Eds Analysis ◽  
Excellent Corrosion Resistance

Titanium alloys possess unique combination of good mechanical properties and excellent corrosion resistance which make them an attractive material for application in many engineering areas. Along with these properties there are some disadvantages which can be eliminated successfully using different surface treatment methods. One of the most commonly used among them is anodizing. This article presents investigation of the results obtained from anodizing titanium alloy Ti-6Al-7Nb using sulphuric acid. The quality assessment and morphology of the anodized layer is made using a micro structural analysis, EDS analysis, XRD analysis and microhardness measurements.

scholarly journals ORTHODONTIC TREATMENT WITH Nd-Fe-B MAGNETS

2020 ◽  
Vol 3 ◽  
pp. 54-62
Author(s):  
Valerii Kutsevlyak ◽  
Vladyslav Starikov ◽  
Volodymyr Samofalov ◽  
Vadym Starikov
Keyword(s):  
Corrosion Resistance ◽  
Permanent Magnets ◽  
Mutual Influence ◽  
Electrochemical Corrosion ◽  
Magnetic Interaction ◽  
Original Method ◽  
Physiological Solution ◽  
Protective Oxide ◽  
Corrosion Properties ◽  
Interaction Forces

The aim. The development of methodology for experimental and theoretical assessment of interaction forces between magnets in an orthodontic apparatus, the test of corrosion resistance of protective oxide and nitride coatings deposited on Nd-Fe-B magnets surface. Materials and methods. The Nd-Fe-B permanent magnets with saturation magnetization Ms≈1100 G and bilayer ZrN / ZrO2 coatings were used. To experimental measure of interaction forces between magnets the device was assembled on the base of analytical balance. The distance between the magnets was varied using non-magnetic plates. The ZrO2 and ZrN coatings have been analyzed for their corrosion properties in 0.9 % NaCl quasi-physiological solution. Results. An original method was proposed for calculating of magnetic interaction forces for materials with high magnetic anisotropy, which has good agreement with experimental measurement of forces. The theoretical model takes into account the size of the magnets and the mutual influence of their opposite faces. An increase of corrosion resistance of magnetic materials can be provided by zirconium oxide or nitride compounds, which contribute to inhibition of electrochemical corrosion of Nd-Fe-B magnets. Conclusions. A method for calculating of interaction forces between permanent magnets, which are used for correction of malocclusion in orthodontic, has been developed. The passivation of the Nd-Fe-B permanent magnets surface can be achieved by applying of bilayer ZrN / ZrO2 coating.

Microstructure and Corrosion of Laser Cladding Coatings on Titanium Alloy With Nd2O3

2020 ◽  
Vol 143 (1) ◽  
Author(s):  
Guangyu Han ◽  
Youfeng Zhang
Keyword(s):  
Corrosion Resistance ◽  
Titanium Alloy ◽  
Laser Cladding ◽  
Electrical Impedance ◽  
Composite Coatings ◽  
Electrical Impedance Spectroscopy ◽  
Corrosion Properties ◽  
Capacitive Behavior ◽  
Refined Microstructure

Abstract Composite coatings of TiB were successfully obtained on the surface of a Ti–6Al–4V alloy by in situ laser cladding technology using Ti/B/Nd2O3 powders. The microstructure and corrosion resistance of the fabricated composite coatings were investigated because relevant studies have been thus far limited in this field. The results indicate that the cladding coating and the substrate combined well via metallurgy after laser cladding treatment, and no obvious cracks were observed in the cladding coatings. The coatings comprise only the TiB and the α-Ti phase. The addition of Nd2O3 promoted the formation of a uniform and refined microstructure of the cladding coatings, and a well-defined structure was obtained when the added Nd2O3 content was 2 wt%. The microhardness of the cladding coating obviously improved by 3 to 4 fold above that of the Ti–6Al–4V substrate. Moreover, the corrosion properties significantly improved by adding Nd2O3 into the coatings. Electrical impedance spectroscopy and polarization tests showed that the best corrosion resistance of the cladding coating was achieved with the addition of 2 wt% Nd2O3. All samples revealed obvious near-capacitive behavior after immersion in a corrosive medium.

ELINVAR EXTRA

Alloy Digest ◽  
1957 ◽  
Vol 6 (3) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Titanium Alloy ◽  
Physical Properties ◽  
Surface Treatment ◽  
Tensile Properties ◽  
Heat Treating ◽  
Limited Range ◽  
Constant Modulus ◽  
Nickel Chromium ◽  
Iron Nickel

Abstract ELINVAR EXTRA is an age-hardenable iron-nickel-chromium-titanium alloy having a constant modulus with a zero thermoelastic coefficient over a limited range of temperature from minus 50 deg. F. to a plus 150 deg. F. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, joining, and surface treatment. Filing Code: Fe-12. Producer or source: Allied Products Division.

scholarly journals Electrophoretic Co-deposition of Polyetheretherketone and Graphite Particles: Microstructure, Electrochemical Corrosion Resistance, and Coating Adhesion to a Titanium Alloy

Materials ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3251 ◽  
Author(s):  
Aleksandra Fiołek ◽  
Sławomir Zimowski ◽  
Agnieszka Kopia ◽  
Alicja Łukaszczyk ◽  
Tomasz Moskalewicz
Keyword(s):  
Electron Microscopy ◽  
Heat Treatment ◽  
Corrosion Resistance ◽  
Titanium Alloy ◽  
Composite Coatings ◽  
Electrochemical Techniques ◽  
Electrochemical Corrosion ◽  
Graphite Particles ◽  
Peek Composite ◽  
Electrochemical Corrosion Resistance

The present study explores the possibilities of fabricating a graphite/polyetheretherketone (PEEK) composite coating on a Ti-6Al-4V titanium alloy through duplex treatment consisting of electrophoretic deposition (EPD) and heat treatment. It has been found that the electrophoretic co-deposition of graphite and PEEK microparticles can be performed from environmentally-friendly pure ethanolic suspensions. Zeta potential measurements and a study of the interaction between both particle types with the use of transmission electron microscopy allowed potential mechanisms of particle co-deposition to be indicated. Microstructure characterization was performed on macro-, micro- and nanoscale using visible light microscopy, X-ray diffractometry and electron microscopy. This allowed the coating homogeneity and distribution of graphite particles in the polymer matrix to be described. Graphite particles in the form of graphene nanosheet packages were relatively evenly distributed in the coating matrix and oriented parallel to the coating surface. The heat-treated coatings showed high scratch resistance and no adhesive type destruction was observed, but they were highly susceptible to deformation. The corrosion measurements were performed with use of electrochemical techniques like open circuit potential and linear sweep voltamperometry. The coated alloy indicated better electrochemical corrosion resistance compared with the uncoated alloy. This work showed the high versatility of the electrophoretic co-deposition of graphite and PEEK particles, which combined with post-EPD heat treatment allows composite coatings to be fabricated with controlled distribution of graphite particles.

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