Study of Corrosion-Resistance on Biomedical Coating by Different Surface Treatments

2014 ◽  
Vol 563 ◽  
pp. 391-395
Author(s):  
Hui Ping Shao ◽  
Sheng Jiang Wu ◽  
Tao Lin ◽  
Ran Wei
Keyword(s):  
Corrosion Resistance ◽  
Composite Coatings ◽  
Substrate Surface ◽  
Porous Titanium ◽  
Gel Casting ◽  
Polarization Test ◽  
Naoh Solution ◽  
Simulated Body Fluids ◽  
Surface Morphologies ◽  
Biomedical Coating

The porous titanium alloy prepared by gel-casting methods was used as precursor and the composite coatings with hydroxyapatite HA/TiO2were prepared on the precursor which was treated by NaOH solution, H2O2+ NH3solution, HF+HNO3, PdCl2solution to improve the capability of coatings. The microstructure was examined by SEM and the corrosion behavior of the coating layers in the simulated body fluids (SBF) was evaluated by potentiodynamic polarization test and impedance plots. The results show that the corrosion resistance of samples using PdCl2treatment is superior to else others. The PdCl2processing provides the substrate surface an excellent oxide film, which plays a key role in the corrosion resistance of coating. The thickness of the coatings is about 60μm and the surface morphologies are more uniform than the others and have no crack.

Influences of Different Surface Treatments on Titanium Substrate to HA/TiO2 Bioactive Coatings

2014 ◽  
Vol 893 ◽  
pp. 508-511
Author(s):  
Sheng Jiang Wu ◽  
Hui Ping Shao ◽  
Ran Wei
Keyword(s):  
Corrosion Resistance ◽  
Composite Coatings ◽  
Solution Treatment ◽  
Titanium Substrate ◽  
Porous Titanium ◽  
Linear Distribution ◽  
Bioactive Coatings ◽  
Gel Casting ◽  
Naoh Solution ◽  
Surface Morphologies

The porous titanium alloy containing 17.5 wt% molybdenum elements prepared by gel-casting methods was used as precursor. The composite coatings with hydroxyapatite and TiO2prepared on the precursor was treated respectively by NaOH solution, 30% H2O2+NH3solution, HF+HNO3and PdCl2solution to improve the characterization of coatings. The microstructure was examined by SEM, and part of the coatings was examined by EDS to indicate the linear distribution of HA and TiO2. The corrosion behavior of the coatings in the simulated body fluids (SBF) was evaluated by potentiodynamic polarization test and impedance plots. The results showed that the corrosion resistance of the coatings treated with PdCl2solution was better than the others. The passivation layer which played a key role in corrosion resistance was generated by PdCl2solution treatment; their surface morphologies was more uniform than the others and had no crack; the thickness of the coatings was 60~70μm.

Preparation of Biomedical Coating on Porous Titanium Alloy

2013 ◽  
Vol 634-638 ◽  
pp. 2989-2992
Author(s):  
Hui Ping Shao ◽  
Ran Wei ◽  
Tao Lin
Keyword(s):  
Composite Coatings ◽  
Porous Titanium ◽  
Solid Content ◽  
X Ray Diffraction ◽  
Linear Distribution ◽  
X Ray ◽  
Gel Casting ◽  
Water Base ◽  
Biomedical Coating ◽  
Scanning Electron

The porous titanium alloys containing molybdenum elements have been prepared by gel-casting methods. The composite coatings with hydroxyapatite (HAP) and TiO2 were prepared on the precursor in this study. The microstructure was examined by scanning electron microscopy (SEM) and X-ray diffraction, and part of the coatings was examined by EDS to indicate the linear distribution of HAP and TiO2. The Solid content of gel-casting of water base can reacSubscript texth 35%，and porosity can reduce to 42% after sintering.

Electrodeposition of MgO/Calcium Phosphate Composite Coatings on Titanium for Biomedical Applications

2013 ◽  
Vol 785-786 ◽  
pp. 872-876
Author(s):  
Yong Huang ◽  
Shu Guang Han ◽  
Ya Jing Yan ◽  
Xiao Feng Pang
Keyword(s):  
Corrosion Resistance ◽  
Phase Composition ◽  
Calcium Phosphate ◽  
Biomedical Applications ◽  
Lower Layer ◽  
Composite Coatings ◽  
Polarization Test ◽  
Coated Surface ◽  
Bare Titanium ◽  
Superior Corrosion Resistance

This work elucidated corrosion resistance of the electrodeposited MgO/calcium phosphate (Ca-P/MgO) films on titanium (Ti). The microstructure, phase composition, and corrosion resistance of the films were studied. Results revealed that The Ca-P/MgO composite coatings were rough and inhomogeneous, the upper layer was floral-like crystals or flakes agglomerates morphology, and the lower layer was needle-like crystals which were mutually cross linked. The coating was very dense, and the content of Mg was about 0.3 wt%. Potentiodynamic polarization test manifested that the Ca-P/MgO-coated surface exhibited superior corrosion resistance than the bare titanium.

Effect of N2H4 on Electrodeposition of Ni-Graphene Composite Coatings and their Corrosion Resistance Property

2015 ◽  
Vol 816 ◽  
pp. 192-199 ◽  
Author(s):  
Quan Yao Yu ◽  
Ying Xin Zhang ◽  
Zhen Zhen Liu ◽  
Zhi Xiang Zeng ◽  
Xue Dong Wu ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Composite Coatings ◽  
Nickel Sulfate ◽  
Anticorrosion Property ◽  
Deposition Method ◽  
Graphene Composite ◽  
Nickel Coatings ◽  
Corrosion Resistance Property ◽  
Electrochemical Deposition Method ◽  
Polarization Test

The Ni-graphene composite coatings were prepared by electrochemical deposition method, using nickel sulfate and graphene as primary reagents. Pure Ni coatings, Ni-graphene coatings with N2H4 and Ni-graphene coatings without N2H4 were prepared from three different but similar electrolytes. The N2H4 added into the solution is for complexation with NiSO4 to settle the Ni ions. Graphene used in this work is characterized by TEM and HRTEM. The reaction of N2H4 with NiSO4 is characterized by XRD and optical graphs. The composite coatings’ morphology, structure and corrosion resistance were characterized by SEM and Potentiodynamic polarization test, respectively. The results show that well dispersed graphene–nickel coatings can be prepared with N2H4 in the electrolyte. By comparison with the situation that electrolyte without N2H4, graphene agglomerated at the surface of nickel coatings. The grain of the coatings prepared with and without N2H4 shows similar sizes. Ni-graphene coatings exhibit poor anticorrosion property by comparison with pure Ni coatings because of the defects (cracks and roughness on composite coatings with and without N2H4 in the solution, respectively) on the surface of graphene nickel coatings. These results provide a basis viewpoint for the further research of graphene-metallic composite coatings’ anticorrosion effect.

Corrosion Resistance of Ni-ZrO2 Nanocomposite Coating Prepared by Pulse Electrodeposition with Rotating Cathode in an Ultrasonic Field

2013 ◽  
Vol 278-280 ◽  
pp. 422-425 ◽  
Author(s):  
Ya Fang Tian ◽  
Xian Hui Li ◽  
Zheng Hong Ao ◽  
Yu Jun Xue
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Rate ◽  
Composite Coating ◽  
Pulse Current ◽  
Composite Coatings ◽  
Ultrasonic Field ◽  
Nanocomposite Coating ◽  
Pulse Electrodeposition ◽  
Lower Corrosion Rate ◽  
Surface Morphologies

The Ni- ZrO2 nanocomposite coatings were prepared by pulse electrodeposition with rotating cathode in an ultrasonic field, and the corrosion resistance of the coatings were studied in 5% H2SO4. The surface morphologies of composite coatings after corrosion were analyzed by scanning electron microscope (SEM). And corrosion rate was tested using an electronic balance. The results shows that, compared with pure Ni coating, pulse current composite coating and pulse current composite coating with ultrasound, the Ni-ZrO2 nanocomposite coating prepared by pulse electrodeposition with rotating cathode in an ultrasonic field has more uniform micro-structure, more compacted grain and lower corrosion rate. Peculiarly, it exhibits excellent corrosion resistance.

scholarly journals Microstructure and Corrosion Resistance of WC-Based Cermet/Fe-Based Amorphous Alloy Composite Coatings

Coatings ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 393 ◽  
Author(s):  
Liping Xu ◽  
Jinbing Song ◽  
Xiaofeng Zhang ◽  
Changguang Deng ◽  
Min Liu ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Amorphous Alloy ◽  
Composite Coating ◽  
Composite Coatings ◽  
Alloy Composite ◽  
Electrochemical Tests ◽  
Transmission Electron ◽  
Alkaline Electrolytes ◽  
Naoh Solution ◽  
Corrosive Environments

There is an urgent need to improve the corrosion resistance of WC-based cermet coatings in different corrosive environments. The main objective of this work was to investigate the microstructure and evaluate the corrosion resistance in neutral, acidic, and alkaline electrolytes of the WC-based cermet/Fe-based amorphous alloy composite coating. Thus, a composite coating of WC–CoCr/Fe-based amorphous alloy and a single WC–CoCr coating were fabricated using the high-velocity oxygen fuel (HVOF) process. The phase composition, microstructure of the original powders, and as-sprayed coatings were studied. The detailed interface information between different compositions of the composite coating was observed by high-resolution transmission electron microscopy (HRTEM). The corrosion resistance of the coatings was studied comparatively by electrochemical tests in 3.5 wt % NaCl, 1 M HCl and 1 M NaOH solutions, respectively. Results showed that the composited coating had a dense layered structure with a composition of WC, Fe-based amorphous alloy, and small amount of W2C. It was revealed that obvious inter-diffusion exists between the interfaces of tungsten carbide/Co, Cr binder and WC–CoCr/Fe-based amorphous alloy. The electrochemical test results showed that the composite coating displayed better corrosion resistance than single WC–CoCr coating both in 3.5 wt % NaCl solution and in 1 M NaOH solution.

Characterization of Cr-α-Al2O3 Composite Coatings Electrodeposited from Cr(Ⅲ) Plating Bath

2011 ◽  
Vol 121-126 ◽  
pp. 60-64
Author(s):  
Xin Sun ◽  
Xiang Zhu He ◽  
Yong Xiu Wang ◽  
Zhi Hong Fu
Keyword(s):  
Corrosion Resistance ◽  
Direct Current ◽  
Composite Coatings ◽  
Microhardness Measurement ◽  
Plating Bath ◽  
Fine Grained ◽  
Measurement Results ◽  
Naoh Solution ◽  
Fine Grained Structure

Cr-α-Al2O3composite coatings were prepared by direct current deposition experiments from Cr(Ⅲ) plating bath and the thickness of composite coatings could be up to 14 μm. The obtained Cr-α-Al2O3coatings and Cr coatings were characterized by means of EDS, SEM and microhardness measurement. Results revealed that Cr-α-Al2O3coatings exhibit fine-grained structure with uniform surface and the highest microhardness values(692 HV) when the α-Al2O3content of coatings was 15g/L, although some pores and defects are still present in the coatings. Analysis of Tafel curves indicated that the presence of α-Al2O3in the Cr coatings show better features in the corrosion resistance both in H2SO4and NaOH solution than those prepared from the bath without α-Al2O3.

scholarly journals The Corrosion Resistance and Mechanism of AT13/Fe-based Amorphous Composite Coatings

2021 ◽  
Author(s):  
Zhenhua Chu ◽  
Shikun Teng ◽  
Yuyun Zhou ◽  
Xingwei Zheng ◽  
Jingxiang Xu ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Composite Coatings ◽  
Corrosion Current ◽  
Amorphous Coating ◽  
Passivation Film ◽  
Immersion Corrosion ◽  
Long Time ◽  
Naoh Solution ◽  
Superior Corrosion Resistance ◽  
Glassy Coating

In the present study, the corrosion resistance of amorphous coating and composite coatings in 3.5 wt.% NaCl, 0.5 M H2SO4 and 10 wt.% NaOH solution were studied. The composite coatings exhibit superior corrosion resistance. When the content of AT13 （Al2O3–13 wt.% TiO2）was 15 wt.%, the composite coating has the lowest corrosion current density (1.75×10-6 A cm-2), which is 5.14×10-5 A cm-2 for Fe-based metallic glassy coating, and the highest corrosion potential (-411 mV), which is -580 mV for Fe-based metallic glassy coating. The breakdown potential of the passivation film in 3.5 wt.% NaCl solution was much higher than that of 316L.The long-time immersion corrosion tests carried out on different coatings showed that the corrosion protection effect of coating was enhanced with the increase of the amount of AT13 added.

The Roles of Ti Particles in Improving the Corrosion Resistance of Electrochemically Assembled Ni-Ti Composite Coatings

CORROSION ◽  
10.5006/2408 ◽  
2017 ◽  
Vol 73 (9) ◽  
pp. 1107-1118 ◽  
Author(s):  
Yuantao Zhao ◽  
Lianbo Wang ◽  
Zhenbo Qin ◽  
Chengxi Wang ◽  
Zhou Xu ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Composite Coatings ◽  
Corrosion Current ◽  
Localized Corrosion ◽  
Corrosion Mechanism ◽  
Nacl Solution ◽  
Oriented Texture ◽  
Naoh Solution ◽  
Order Of Magnitude ◽  
Ti Particles

The influences of co-deposited Ti particles on corrosion behavior of electrodeposited Ni-Ti coatings were investigated. The co-deposited Ti particles caused the refined crystallite size and random-oriented texture of Ni-Ti coating. In 3.5 wt% sodium chloride (NaCl) solution, the buried Ti particles in Ni matrix blocked the corrosion path and rapid intercrystalline corrosion. The inert TiO2 could form on the exposed Ti particles and hinder localized corrosion. In 10 wt% sodium hydroxide (NaOH) solution, Ni matrix crystallites, refined by co-deposited Ti particles, contributed to formation of the passive Ni(OH)2 film. The corrosion current of Ni-Ti coating decreased by about one order of magnitude in both solutions with respect to pure Ni coating, demonstrating the co-deposited Ti particles greatly improved the corrosion resistance of Ni-Ti composite coatings. Finally, a corrosion mechanism was built to explain the co-deposited Ti particles improved corrosion resistance of the Ni-Ti composite coatings.

scholarly journals Electrodeposition Based Preparation of Zn–Ni Alloy and Zn–Ni–WC Nano-Composite Coatings for Corrosion-Resistant Applications

Coatings ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 712
Author(s):  
Channagiri Mohankumar Praveen Kumar ◽  
Avinash Lakshmikanthan ◽  
Manjunath Patel Gowdru Chandrashekarappa ◽  
Danil Yurievich Pimenov ◽  
Khaled Giasin
Keyword(s):  
Corrosion Rate ◽  
Electrochemical Impedance ◽  
Steel Substrate ◽  
Composite Coatings ◽  
Substrate Surface ◽  
X Ray Diffraction ◽  
Corrosion Resistant ◽  
X Ray ◽  
Texture Coefficients ◽  
Surface Morphologies

Zinc (Zn) is one of the five most widely consumed metals in the world. Indeed, more than 50% of all the zinc produced is used in zinc-galvanizing processes to protect steel from corrosion. Zn-based coatings have the potential for use as a corrosion-resistant barrier, but their wider use is restricted due to the poor mechanical properties of Zn that are needed to protect steel and other metals from rusting. The addition of other alloying elements such as Ni (Nickle) and WC (Tungsten Carbide) to Zn coating can improve its performance. This study investigates, the corrosion performance of Zn–Ni coating and Zn–Ni–WC composite nanocoatings fabricated on mild steel substrate in an environmentally friendly bath solution. The influence of WC nanoparticles on Zn–Ni deposition was also investigated. The surface morphologies, texture coefficients via XRD (X-ray diffraction), SEM (Scanning Electron Microscopy), and EDS (Energy-dispersive X-ray spectroscopy) were analyzed. The electrochemical test such as polarization curves (PC) and electrochemical impedance spectroscopy (EIS) resulted in a corrosion rate of 0.6948 Å/min for Zn–Ni–WC composite nanocoating, and 1.192 Å/min for Zn–Ni coating. The results showed that the Zn–Ni–WC composite nanocoating reduced the corrosion rate by 41.71% and showed an 8.56% increase in microhardness compared to the hardness of the Zn–Ni coating. These results are augmented to better wettable characteristics of zinc, which developed good interfacial metallurgical adhesion amongst the Ni and WC elements. The results of the novel Zn–Ni–WC nanocomposite coatings achieved a great improvement of mechanical property and corrosion protection to the steel substrate surface.

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