Studies on corrosion resistance and bio-activity of plasma spray deposited hydroxylapatite (HA) based TiO 2 and ZrO 2 dispersed composite coatings on titanium alloy (Ti-6Al-4V) and the same after post spray heat treatment

2017 ◽  
Vol 420 ◽  
pp. 935-943 ◽  
Author(s):  
Renu Kumari ◽  
Jyotsna Dutta Majumdar
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Titanium Alloy ◽  
Plasma Spray ◽  
Composite Coatings ◽  
Post Spray Heat Treatment

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.

Ti-5Al-4FeCr

Alloy Digest ◽  
1969 ◽  
Vol 18 (6) ◽  
Keyword(s):  
Heat Treatment ◽  
Fracture Toughness ◽  
Corrosion Resistance ◽  
Titanium Alloy ◽  
High Temperature ◽  
Heat Treating ◽  
Age Hardening ◽  
Temperature Performance ◽  
Alpha Beta ◽  
Hardening Heat Treatment

Abstract Ti-5A1-4FeCr is an alpha-beta type titanium alloy recommended for airframe components. It responds to an age-hardening heat treatment. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Ti-58. Producer or source: Titanium alloy mills.

Characterization of Ni-P and Ni-P-Al2O3 Heat Treated Layers

2017 ◽  
Vol 1143 ◽  
pp. 26-31
Author(s):  
Lucica Balint ◽  
Gina Genoveva Istrate
Keyword(s):  
Electron Microscopy ◽  
Heat Treatment ◽  
Corrosion Resistance ◽  
Composite Coatings ◽  
Treatment Temperature ◽  
Initial State ◽  
X Ray ◽  
Transmission Electron ◽  
Heat Treated ◽  
Before And After

Research has shown the relationship among hardness, usage and corrosion resistance Ni-P-Al2O3 composite coatings on steel support heat treated. The electroless strips were heat treated at 200°C, 300°C, 400°C, 500°C and 600°C. Further studies on corrosion, hardness and usage revealed changes in properties, compared to the initial state, both on the strips coated with Ni-P and the ones coated with Ni-P-Al2O3 composite. The samples have been studied before and after the heat treatment via Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), Energy Dispersive X-ray Analysis (EDX) and X-Ray Diffraction (XRD). The results show that untreated Ni-P layers exhibit strong corrosion resistance, while hardness and usage increase with heat treatment temperature, with a peak at 400 °C. Using suspended particles co-deposition, led to new types of layers, some with excellent hardness and usage properties. Corrosion resistance increase with heat treatment. Coating layers can be adjusted to the desired characteristics, by selecting proper parameters for the expected specific results.

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.

CRUCIBLE BETA III

Alloy Digest ◽  
1970 ◽  
Vol 19 (7) ◽  
Keyword(s):  
Heat Treatment ◽  
Fracture Toughness ◽  
Corrosion Resistance ◽  
Titanium Alloy ◽  
Heat Treating ◽  
Bend Strength ◽  
Beta Titanium Alloy ◽  
Steel Company ◽  
Beta Titanium ◽  
Crucible Steel

Abstract CRUCIBLE BETA III is a heat-treatable beta titanium alloy offering outstanding cold formability and simple heat treatment to high strengths. It is recommended for aircraft parts and fasteners. This datasheet provides information on composition, physical properties, elasticity, tensile properties, and shear and bend strength as well as fracture toughness and creep. It also includes information on corrosion resistance as well as forming, heat treating, joining, and surface treatment. Filing Code: Ti-59. Producer or source: Crucible Steel Company of America, Titanium Division.

Research on Preparation and Properties of Antiwear and Anticorrosion Composite Coating Ni-P-SiC

2014 ◽  
Vol 988 ◽  
pp. 117-120
Author(s):  
Ya Min Li ◽  
Xing Zhang ◽  
Amin Wang ◽  
Hong Jun Liu
Keyword(s):  
Heat Treatment ◽  
Wear Resistance ◽  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Electroless Plating ◽  
Bonding Strength ◽  
Composite Coatings ◽  
Micro Hardness ◽  
Uniform Thickness ◽  
Structure And Morphology

Ni-P-SiC composite coatings on the surface of ZL102 aluminum alloy were prepared by direct electroless plating. The structure and morphology of the coatings after heat treatment at 400 °C for 1 hour were analyzed by XRD and SEM. The bonding strength, hardness, corrosion resistance and wear resistance of the coatings were tested. The results show that the coatings structure is crystalline and the main crystal phase is Ni3P. The SiC particles are evenly distributed in the coatings. The coatings have uniform thickness, high bonding strength and high micro hardness (up to 1395.28 HV.2). It is also shown that the substrate corrosion resistance and wear resistance can be considerably improved after electroless plating.

Effect of Heat Treatment on Microstructure and Corrosion Resistance of Ni-P/BN(h) Composite Coatings

2011 ◽  
Vol 239-242 ◽  
pp. 3362-3366
Author(s):  
Cheng Zhang Peng ◽  
Ling Ling Zhu ◽  
You Ming Chen
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Composite Coatings ◽  
Stable State ◽  
Amorphous Structure ◽  
Treatment Temperature ◽  
X Ray Diffraction ◽  
Pulse Electroplating ◽  
Heat Treated ◽  
Precipitated Phases

The Ni-P/ BN(h) composite coatings were prepared by pulse electroplating,and were heat treated at temperature of 200～400°C.The microstructure of the composite coatings was identified by X-ray diffraction,the corrosion behavior of the composite coatings in 3.5%NaCl and 10%H2SO4 solutions was investigated by the linear polarization measurements and scanning electron microscope (SEM).The results show that the as-deposited is an amorphous structure,the precipitated phases are Ni12P5 and Ni5P2 metastable state phases when heat treatment temperature is below 300°C,the precipitated phases is Ni3P stable state phase heat-treated at 400°C，the composite coating was crystallized in great degree.Both the as-deposited and heat treated composite coatings revealed best corrosion resistance in 3.5%NaCl and 10%H2SO4 solutions.

Effects of Content of Al2O3 Particles and Heat Treatment on Corrosion Resistance of Ni-P-Al2O3 Composite Coatings

2010 ◽  
Vol 105-106 ◽  
pp. 441-443 ◽  
Author(s):  
Jian Hua Lu ◽  
Wan Chang Sun ◽  
Ming Zhu ◽  
Ming Feng Tan ◽  
Quan Zhou
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Uniform Distribution ◽  
Composite Coatings ◽  
Al2o3 Composite ◽  
Heat Treated ◽  
Plating Solution ◽  
Al2o3 Particles

Ni-P-Al2O3 composite coatings with the uniform distribution of Al2O3 particles were prepared by adding Al2O3 particles into Ni-P plating solution and adopting optimum plating process. The morphology and microstructure of the coatings were investigated by using SEM, EDS and XRD. Being immersed in 10 vol.% H2SO4 solutions, the corrosion resistance of Ni-P-Al2O3 composite coatings was tested. The results show that when the solubility of Al2O3 particles in plating solution is 8 g/l, the corrosion resistance is best. Comparing with as-plated Ni-P-Al2O3 composite coatings, the corrosion resistance of heat-treated Ni-P-Al2O3 composite coatings decreases by raising the temperature to 300°C and then increases by raising the temperature to 450°C.

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