The Study of Electroless Ni-P and Ni-P-PTFE Coating on Steel Tire Mold

2012 ◽  
Vol 501 ◽  
pp. 316-320
Author(s):  
Jian Zhang Guo ◽  
Bin Xu
Keyword(s):  
Wear Resistance ◽  
Corrosion Resistance ◽  
Pore Structure ◽  
Energy Dispersive Spectrometer ◽  
Salt Spray ◽  
Amorphous Structure ◽  
Carbon Steels ◽  
Electrochemical System ◽  
Electroless Ni ◽  
Scanning Electron

In order to improve the surface property of the steel tire mold, carbon steels were processed by electroless Ni-P and Ni-P-PTFE under contrast experiment. The coatings were characterized by Scanning Electron Microscopy (SEM) and Energy Dispersive Spectrometer (EDS). The wear resistance and corrosion resistance of the coatings were explored by tribometer, salt spray cabinet and advanced electrochemical system. The experimental results showed that the Ni-P coating was amorphous structure, and the Ni-P-PTFE coating was micro-pore structure; The wear resistance of Ni-P-PTFE coating was superior to Ni-P coating; In view of the micro-pore structure, the corrosion resistance of Ni-P-PTFE coating was worse than Ni-P coating, but they were all superior to carbon steels, and the service life of the steel tire mold were improved.

The Study of Electroless Ni-B Coating on 45 Steel

2012 ◽  
Vol 501 ◽  
pp. 185-189
Author(s):  
Jian Zhang Guo ◽  
Qian Liu
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Corrosion Resistance ◽  
Energy Dispersive Spectrometer ◽  
Salt Spray ◽  
High Hardness ◽  
Experimental Results ◽  
Electroless Ni ◽  
Scanning Electron ◽  
Optimal Formula

In order to improve the corrosion resistance and the hardness of the 45 steel, under comparison tests, the electroless Ni-B was prepared on the 45 steel. We made a contrast test to get the optimal formula. The coating under the optimal formula was characterized by Scanning Electron Microscopy(SEM), Energy Dispersive Spectrometer(EDS), metallurgical microscope and salt spray cabinet. The experimental results showed that the electroless Ni-B coating on 45 steel was low boron coating, with high hardness, and the hardness of the coating could catch HV524; the thickness of the coating was 16μm.

Effect of Rare Earth Cerium on the Synthesis and Wear-Resistance of Electroless Ni-P-PTFE Coatings

2013 ◽  
Vol 750-752 ◽  
pp. 1996-2002 ◽  
Author(s):  
Da Yong Liu ◽  
Long Gen Li ◽  
Li Sheng Liu
Keyword(s):  
Wear Resistance ◽  
Rare Earth ◽  
Friction Coefficient ◽  
Interfacial Adhesion ◽  
Steel Surface ◽  
Energy Dispersive Spectrometer ◽  
Wear Test ◽  
Low Friction ◽  
Electroless Ni ◽  
Scanning Electron

By adding various concentrations of rare earth cerium into the acidic hypophosphite plating baths, electroless Ni-P-PTFE coatings have been successfully deposited on the surface of shaft made of mild steel. Surface morphology, microhardness and interfacial adhesion of the coatings were characterized by scanning electron microscope equipped with energy dispersive spectrometer, vicker microhardness meter and WS-92 scrape instrument, respectively. Ring-plate wear test was applied to study the friction coefficient and wear resistance of Ni-P-PTFE coating. Results revealed that Ni-P-PTFE coatings deposited with 10ppm or 20ppm cerium in the plating baths show low friction coefficient and high interfacial adhesion,leading to its perfect wear resistance. However, both the interfacial adhesion and wear resistance of the Ni-P-PTFE coatings were decreased drastically as the cerium concentration in the plating baths was exceeds 50ppm.

Evaluation of Corrosion Properties of Electroless NiP/Nano-SiC Composite Coatings

2011 ◽  
Vol 471-472 ◽  
pp. 203-208
Author(s):  
Arman Zarebidaki ◽  
Saeed Reza Allahkaram
Keyword(s):  
Corrosion Resistance ◽  
Composite Coatings ◽  
Energy Dispersive Spectrometer ◽  
Nano Particles ◽  
X Ray Diffraction ◽  
Corrosion Properties ◽  
X Ray ◽  
Electroless Ni ◽  
Different Content ◽  
Scanning Electron

Ni-P/nano- SiC composite coatings were deposited in different concentrations of SiC nano-particles in the bath. The hardness and corrosion resistance of the composite coatings with different content of SiC nano-particles were measured. Moreover, the structure of the composite coatings was investigated by means of X-ray diffraction (XRD), while their morphologies and elemental composition were analyzed using scanning electron microscope (SEM) equipped with energy dispersive spectrometer (EDS). Results showed that co-deposited SiC nano-particles contributed to increase the hardness but corrosion resistance of electroless Ni-P coatings decreased due to agglomeration of nano-particles and increasing porosity of coatings.

scholarly journals Microstructure and Properties of Cr-Fe2B Composite Coatings Prepared by Pack-Preboronizing Combined with Electro Brush-Plating

Coatings ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 519 ◽  
Author(s):  
Jianjun Hu ◽  
Yaoxin Pei ◽  
Yu Liu ◽  
Xian Yang ◽  
Hui Li ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Corrosion Resistance ◽  
Annealing Temperature ◽  
Steel Substrate ◽  
Composite Coatings ◽  
Amorphous Structure ◽  
Carbon Steels ◽  
Excellent Thermal Stability ◽  
Microstructure And Properties ◽  
Brush Plating

Cr-Fe2B composite coatings were prepared on carbon steels by pack-boronizing followed by electro brush-plating. The microstructure and properties of the coatings annealed at different temperatures were studied. The coatings show a gradient structure composed of a Cr-layer and a Fe2B-layer and have excellent thermal stability, and no new layers and/or transition layers are formed in the coating during annealing up to 1000 °C. The Cr-layer has an amorphous structure and is transformed into nanosized grains when the annealing temperature increases to 700 °C. As the annealing temperature is further increased, the nanograins grow rapidly. The microcracks in the Cr-layer increase sharply after annealing at 550 °C and then decrease significantly with any further increase of the annealing temperature. The pre-deposited Fe2B-layer prevents the formation of carbon-poor zones in the steel substrate during annealing. It is considered that high-temperature (>700 °C) annealing helps to eliminate coating defects, increase the coating density and obtain better wear resistance and corrosion resistance. Surprisingly, the as-plated and low temperature annealed samples also show good wear resistance and corrosion resistance, which may be related to their amorphous structure and nanocrystalline structure.

The Study of Electroless Ni-P Coating on Aluminum Tyre Mold

2011 ◽  
Vol 221 ◽  
pp. 511-516 ◽  
Author(s):  
Jian Zhang Guo ◽  
Bin Xu
Keyword(s):  
Aluminum Alloy ◽  
Service Life ◽  
Orthogonal Experiment ◽  
Energy Dispersive Spectrometer ◽  
High Hardness ◽  
Amorphous Structure ◽  
X Ray ◽  
Good Corrosion Resistance ◽  
Electroless Ni ◽  
Scanning Electron

In order to improve the service life of the aluminum tyre mold, AC7A aluminum alloy was processed by electroless Ni-P plating under orthogonal experiment. The coating was characterized by Scanning Electron Microscopy (SEM) ,Energy Dispersive Spectrometer (EDS) and X-ray Diffractometer (XRD).The experimental results showed that the electroless Ni-P coating on aluminum alloy was amorphous structure, with high hardness and good corrosion resistance; the structure became crystal structure after heat treatment, and the hardness of the coating was improved, could catch HV828; the thickness of the coating was 28μm. The results showed that the hardness and thickness of the coating meet the requirement of the AC7A aluminum alloy tyre mold, and the service life of the aluminum tyre mold were improved.

HIGH CORROSION RESISTANCE OF NI-P/NANO-SIO2 ELECTROLESS COMPOSITE COATINGS

2012 ◽  
Vol 05 ◽  
pp. 810-816 ◽  
Author(s):  
S.R. Allahkaram ◽  
T. Rabizadeh
Keyword(s):  
Corrosion Resistance ◽  
Electrochemical Impedance ◽  
Composite Coatings ◽  
Carbon Steels ◽  
Nano Particles ◽  
Chemical Compositions ◽  
High Corrosion Resistance ◽  
Coating Type ◽  
Corrosion Behaviors ◽  
Electroless Ni

The process of electroless plating Ni - P and Ni - P /nano- SiO 2 on API-5L X65 carbon steels was improved. The Ni - P /nano- SiO 2 composite coatings were prepared from the bathes containing different concentrations of nano- SiO 2 particles. The coatings surface and morphologies were observed via scanning electron microscopy (SEM). The chemical compositions were analyzed by EDAX. The corrosion behaviors were evaluated by electrochemical impedance spectroscopy tests. The experimental results indicated that SiO 2 nano-particles co-deposited but some agglomeration occurred. Micro-hardness of electroless Ni - P - SiO 2 composite coatings increased due to the existence of nano-particles. Corrosion tests showed that both electroless Ni - P and Ni - P /nano- SiO 2 composite coatings demonstrated significant improvement of corrosion resistance of substrate in salty atmosphere and latter coating type appeared to offer a better corrosion protection.

Preparation and Salt Spray Corrosion Resistance of Ni/BN and NiCrAl/BN Coatings

2013 ◽  
Vol 537 ◽  
pp. 67-70
Author(s):  
Feng Zhang ◽  
Chuan Bing Huang ◽  
Wei Liu ◽  
Kui Zhou ◽  
Wen Ting Zhang ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Test ◽  
Open Circuit Potential ◽  
Salt Spray ◽  
Open Circuit ◽  
X Ray Diffraction ◽  
Salt Spray Corrosion ◽  
X Ray ◽  
Corrosion Behaviors ◽  
Scanning Electron

Ni/BN and NiCrAl/BN abradable sealing coatings used in turbo engines were prepared by plasma spray technology. The phases and the microstructures of the coatings were characterized with X-ray diffraction (XRD) and scanning electron microscopy (SEM). Corrosion behaviors of these coatings were investigated with open-circuit potential (OCP) and salt spray corrosion test. The results showed that the NiCrAl/BN possess better corrosion resistance as compared with Ni/BN.

Oxidation and Wear Resistance of Ni-Y2O3-ZrO2 Nanocomposite Coating Prepared by Ultrasonic Electrodeposition

2010 ◽  
Vol 455 ◽  
pp. 427-430 ◽  
Author(s):  
Yu Jun Xue ◽  
Chen Shen ◽  
Ji Shun Li ◽  
Yi Liu
Keyword(s):  
Wear Resistance ◽  
Electron Microscope ◽  
Zirconium Oxide ◽  
High Temperature Oxidation ◽  
Energy Dispersive Spectrometer ◽  
Nanocomposite Coating ◽  
Zro2 Nanoparticles ◽  
Environmental Scanning ◽  
Temperature Oxidation ◽  
Scanning Electron

Ni-Y2O3-ZrO2 nanocomposite coating was prepared by co-deposition of nickel, Yttrium oxide (Y2O3) and zirconium oxide (ZrO2) nanoparticles using ultrasonic electrodeopsition. The surface morphology and composition of coatings were ananlyzed by an environmental scanning electron microscope (ESEM) and energy dispersive spectrometer(EDS). The high temperature oxidation, microhardness and wear resistance of the coatings were investigated. It is found that both the incorporation of nanoparticles and the use of ultrasonic could refine Ni crystal grains and improve properties of the coatings. The Ni-Y2O3-ZrO2 nanocomposite coating prepared with ultrasonic exhibits finer grains, higher microhardness and better oxidation and wear resistance.

scholarly journals Synthesis of Ni-P/Ni-P-W Nanocomposite Coating and its Tribological Resistance

2020 ◽  
Vol 8 (10S2) ◽  
pp. 17-19
Keyword(s):  
Phase Transformation ◽  
Steel Substrate ◽  
Amorphous Structure ◽  
Nanocomposite Coating ◽  
Nickel Phosphide ◽  
P Matrix ◽  
Electroless Ni ◽  
Tungsten Nanoparticles ◽  
Grade Steel ◽  
Scanning Electron

The synthesized tungsten nanoparticles (0.5 g/l, range 40 to 150 nm) are dispersed randomly into electroless Ni-P matrix for Ni-P-W nanocompositeplatings on an AISI1040 grade steel substrate (MS). The thickness of these deposits is in range of 15 to 25 micrometer. The scanning electron microscope attached in permutation of energy dispersive spectroscopy furthermore Xray diffraction techniques were exploited to analyze surface morphology, elemental symphony and phases of platings correspondingly. The results of these studies reveal successful fusion of tungsten nanoparticles as white globules into electroless Ni-P matrix and with those as-deposited platings have amorphous structure and heated platings (400°C) have crystalline structure. Further Ni-P/Ni-P-W platings are investigated for microhardness by respective technique. The results of the studies corroborate that inclusion of tungsten nanoparticles into electroless Ni-P plating enhances the microhardness. The phase transformation initiation of amorphous nickel is headed toward nickel phosphide and crystalline nickel completely at 400°C which improved microhardness of nanocomposite Ni-P-W electrolessplatings.

Effect of Li on Corrosion Resistance of Nearly Eutectic Al-Si Casting Alloys

2013 ◽  
Vol 364 ◽  
pp. 573-576
Author(s):  
Yuan Xing Cai ◽  
Zhong Kui Zhao ◽  
Zhi Gang Wang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Corrosion Resistance ◽  
Energy Dispersive Spectrometer ◽  
Lithium Content ◽  
Corrosion Performance ◽  
Surface Appearance ◽  
Tafel Polarization ◽  
Casting Alloys ◽  
Scanning Electron

Lithium was added into ZAlSi12 casting alloys to produce Al-Si-Li alloys containing 0%Li, 1%Li, 2%Li and 3%Li respectively. The corrosion performance of the alloys containing various content of lithium was tested by the Tafel polarization curves and the alloys were dipped thoroughly into the solution of 5% NaCl. The surface appearance of the alloys after corrosion was observed by Scanning Electron Microscopy, the composition of corrosion products was determined by Energy Dispersive Spectrometer. The results show that the corrosion resistance of ZAlSi12 casting alloys is improved by the addition of lithium. The alloy has an optimum corrosion resistance when the lithium content is 2%, and then the corrosion resistance decreases as increment of lithium content.

Sign in / Sign up

Export Citation Format

Share Document