Preparation of Ultra-Fine MgO•Al2O3 Spinel Powder and its Metallurgy Behavior in Low Carbon Steel

2011 ◽  
Vol 675-677 ◽  
pp. 291-294 ◽  
Author(s):  
Yang Li ◽  
Shuang Jiang Li ◽  
Ying Zhuang ◽  
Wei Jian Li ◽  
Zhou Hua Jiang
Keyword(s):  
Carbon Steel ◽  
Solid Phase ◽  
Spinel Phase ◽  
Sol Gel ◽  
Low Carbon Steel ◽  
Fine Powder ◽  
Powder Size ◽  
Low Carbon ◽  
Average Size ◽  
Spinel Powder

Micron, sub-micron and nanometer sized MgO•Al2O3 ultra-fine powders were prepared by gel precipitation, solid-phase synthesis, sol-gel and flame throwing pyrogenation methods. XRD analysis showed that all of the ultra-fine powder is pure with the single MgO•Al2O3 spinel phase. The powder size was measured by laser granularity analyzer and the average size is 1780, 505 and 60 nm with a quite uniform distribution of particle size. MgO•Al2O3 spinel powder with different granularity were sprayed into molten low carbon steel in MgO crucible and MoSi2 furnace at 1873 K. Quantitative microscopic examination showed that big particle inclusions reduce and small particle inclusions increase, as a result, the average size reduce. Data comparison from spraying powders with different size showed that spraying MgO•Al2O3 of nanometer tends to cause more small inclusions in molten steel. The sprayed steel samples were rolled and heat treated for the mechanical properties tests, which showed spraying nanometer MgO•Al2O3 is the best way to improve mechanical property of steel.

Preparation of Ultra-Fine MgO•Al2O3 Spinel Powder and its Metallurgy Behavior in Medium Carbon Steel

2009 ◽  
Vol 79-82 ◽  
pp. 111-114 ◽  
Author(s):  
Yang Li ◽  
Wei Jun Zhi ◽  
Wei Jian Li ◽  
Liang You Wang ◽  
Zhou Hua Jiang
Keyword(s):  
Carbon Steel ◽  
Spinel Phase ◽  
Sol Gel ◽  
Fine Powder ◽  
Xrd Analysis ◽  
Medium Carbon Steel ◽  
Medium Carbon ◽  
Heat Treated ◽  
Average Size ◽  
Spinel Powder

Micron, sub-micron and nanometer sized MgO•Al2O3 ultra-fine powders were prepared by gel precipitation, solid-phrase synthesis, sol-gel and flame throwing pyrogenation methods. XRD analysis shows that the all of the ultra-fine powder is pure with a single MgO•Al2O3 spinel phase. The size is measured by laser granularity analyzer and the average size is 60, 505 and 1780 nm with quite uniform distribution. MgO•Al2O3 spinel powder with different granularity were sprayed into molten medium carbon steel in MgO crucible and MoSi2 furnace at 1873 K. Quantitative microscopic examination shows that big particle inclusions are reduced and small particle inclusions increased, and the average size is reduced. Data comparison from spraying different size powders shows that spraying MgO•Al2O3 of nanometer tends to cause more small inclusions. The sprayed steel samples were rolled and heat treated for the mechanical properties tests, which shows spraying nanometer MgO•Al2O3 is the best way to improve mechanical property.

Effect of Nanoparticle Addition in Hybrid Sol-Gel Silane Coating on Corrosion Resistance of Low Carbon Steel

2013 ◽  
Vol 686 ◽  
pp. 244-249 ◽  
Author(s):  
Poovarasi Balan ◽  
Aaron Ng ◽  
Chee Beng Siang ◽  
R.K. Singh Raman ◽  
Eng Seng Chan
Keyword(s):  
Corrosion Resistance ◽  
Carbon Steel ◽  
Electrochemical Impedance ◽  
Sol Gel ◽  
Low Carbon Steel ◽  
Electrochemical Corrosion ◽  
Alumina Nanoparticles ◽  
Low Carbon ◽  
Silane Coating ◽  
Sol Gel Films

Chromium pre-treatments of metal have been replaced by silane pre-treatments as more environmental friendly option. Nanoparticles can be added in the silane sol-gel network have been reported to improve corrosion resistance. In this work, the electrochemical corrosion resistance of low carbon steel coated with hybrid organic-inorganic sol-gel film filled with nanoparticles was evaluated. The sol-gel films have been synthesized from 3-glycidoxy-propyl-trimethoxy-silane (3-GPTMS) and tetra-ethyl-ortho-silicate (TEOS) precursors. These films have been impregnated with 300 ppm of silica or alumina nanoparticles. The electrochemical behavior of the coated steel was evaluated by means of electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM). Equivalent circuit modeling, used for quantifying the EIS measurements showed that sol-gel films containing silica nanoparticles improved the barrier properties of the silane coating. The silica nanoparticle-containing films showed highest initial pore resistance over the five days of immersion in 0.05M NaCl.

Effect of Sol-Gel Film on the Corrosion Resistance of Low Carbon Steel Plate

2020 ◽  
Vol 984 ◽  
pp. 43-50
Author(s):  
Hua Yuan Zhang ◽  
Can Wang ◽  
Bing Xue ◽  
Jing Luo
Keyword(s):  
Corrosion Resistance ◽  
Carbon Steel ◽  
Steel Plate ◽  
Salt Spray ◽  
Sol Gel ◽  
Low Carbon Steel ◽  
Corrosion Current ◽  
Neutral Salt ◽  
Low Carbon ◽  
Gel Film

To improve the corrosion resistance on Q235 low carbon steel, in this paper, tetraethyl orthosilicate (TEOS), N-dodecyl trimethoxysilane and γ-(2,3-epoxypropoxy) propytrimethoxysilane (KH560) were used to make organic-inorganic hybrid sol-gel film. Cross cut test adhesion method, neutral salt spray test, electrochemical test and film protective efficiency were taken to value the corrosion resistance property. The corrosion topography was studied by optical microscope. In addition, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) curves and equivalent electric circuit fitting were used to analyze the corrosion mechanism. The cross cut adhesion of sol-gel film can reach 1 class and the protection class can attain 5 class after 72 hours neutral salt spray test. According to the potentiodynamic polarization curve analysis, the corrosion potential of sol-gel film coating sample after 0.5 hours immersion was -0.46 V (vs. SCE) on the 0.1 Hz, and its corrosion current density was 4.74×10-7 A·cm-2. The corrosion potential of bare Q235 low carbon steel plate after 0.5 hours immersion was -0.78 V (vs. SCE) on the 0.1 Hz, and its corrosion current density was 4.75×10-6 A·cm-2. The impedance value on 0.1 Hz (|Z|0.1Hz) (1.27×106 Ω·cm2) of sol-gel film coating sample was more than three orders of magnitude higher than the value of the low carbon steel plate. Even dipping in 3.5 wt. % NaCl for 72 hours, the |Z|0.1Hz value of sol-gel coating sample was still one order of magnitude higher than the low carbon steel plate with 0.5 hours immersion. Sol-gel film with excellent adhesion can significantly improve the corrosion resistance of low carbon steel plate. Sol-gel film can increase the protection efficiency of low carbon steel plate by 90%.

Preparation and Photocathodic Protection Properties of NiP/TiO2 Bilayer Coating on Low Carbon Steel

2011 ◽  
Vol 239-242 ◽  
pp. 334-337
Author(s):  
Min Jie Zhou ◽  
Na Zhang
Keyword(s):  
Corrosion Resistance ◽  
Carbon Steel ◽  
Electroless Plating ◽  
Electrochemical Method ◽  
Sol Gel ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Corrosion Resistance Property ◽  
Photocathodic Protection ◽  
Bilayer Coatings

The NiP/TiO2 bilayer coatings were prepared on low carbon steel substates using a combined electroless plating and sol-gel method. The performance of photocathodic protection of the bilayer coatings was investigated by the electrochemical method. The results show that the coating with four TiO2 layers and calcined at 400°C exhibits the highest photoelectrochemical efficiency and the best corrosion resistance property.

Anticorrosion Performance of Sol–Gel Driven SIO2-Al2O3 Coatings on Low Carbon Steel

2019 ◽  
Vol 55 (3) ◽  
pp. 539-545
Author(s):  
Bosung Seo ◽  
Jangwon Kang ◽  
Sori Won ◽  
Jong Min Park ◽  
Hyo Kyu Kim ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Sol Gel ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Anticorrosion Performance

scholarly journals Characterization of Friction Surfaced Deposits on Low Carbon Steel

2019 ◽  
Vol 9 (1) ◽  
pp. 1248-1251
Keyword(s):  
Carbon Steel ◽  
Quality Evaluation ◽  
Solid Phase ◽  
Low Carbon Steel ◽  
Industrial Applications ◽  
Fusion Welding ◽  
Low Carbon ◽  
Friction Surfacing ◽  
Welding Processes

Surfacing With Friction Is A Process Derived From Friction Welding With Advantages Over Commercial Fusion Welding Processes, With Solid Phase Bonding. Here An Experiment Is Conducted To Produce Friction Surface Coating For Three Different Materials Like Aluminum And Stainless Steel And Tool Steel M2 Coating On Low Carbon Steel By Friction Surfacing. The Aim Of This Work Deposition Of Different Materials Is To Identify The Feasibility Of Friction Surfacing And Industrial Applications, Testing Of Deposits For Quality Evaluation Are Carried Out.

scholarly journals New architectured hybrid sol-gel coatings for wear and corrosion protection of low-carbon steel

2016 ◽  
Vol 99 ◽  
pp. 337-345 ◽  
Author(s):  
Lavollée Claire ◽  
Gressier Marie ◽  
Garcia Julien ◽  
Sobrino Jean-Michel ◽  
Reby Jean ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Corrosion Protection ◽  
Sol Gel ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Wear And Corrosion

Application of Alumina-Magnesia Precast Blocks for LF Refining Ladle

2013 ◽  
Vol 745-746 ◽  
pp. 594-598
Author(s):  
Hai Xia Feng ◽  
Jun Liu ◽  
Yi Wei
Keyword(s):  
Melting Point ◽  
Carbon Steel ◽  
Spinel Phase ◽  
Low Carbon Steel ◽  
Slag Layer ◽  
Low Carbon ◽  
Dense Area ◽  
Low Viscosity ◽  
Ultra Low Carbon Steel ◽  
Lf Refining

The alumina-magnesia precast blocks developed in authors company have been successfully used in 90-ton LF refining with an average service life 80-85 heats to meet the smelting demand of low carbon steel and ultra low carbon steel. The observation of the residual blocks revealed that the section of the used blocks was divided into four layers from inside to the surface, i.e., slag layer, reaction layer, penetration layer and the original block. It has been found that there was a certain degree of structure spalling of the used blocks. The main factor of blocks damage may be due to the penetration and erosion of molten slag. The results of SEM microstructure analysis indicated that the calcium oxide (CaO) of high basicity slag easily penetrated into the blocks and formed CA6 phase, and then transformed into CA2 or C12A7 phases gradually with the decreasing content of alumina (Al2O3). It has been found that an annular distribution structure, and the silicon dioxide (SiO2) was easily lost together with slag and formed SiO2-rich part in the penetration layer due to the formation of low viscosity and low melting point phase of C2AS. A large number of-5um spinel particles (MgAl2O4) were synthesized at 1600~ 1700, which could absorb FeO, MnO and other impurities in slag to form composite spinel phase. It is believed that the high melting point phases intertwined to form a dense area which was beneficial to improve the bricks' slag resistances to penetration and corrosion

Dynamic Recrystallization of Ferrite in a Low Carbon Steel with the (α+θ) Duplex Microstructures

2012 ◽  
Vol 715-716 ◽  
pp. 902-906
Author(s):  
Long Fei Li ◽  
Wang Yue Yang ◽  
Zu Qing Sun
Keyword(s):  
Carbon Steel ◽  
Dynamic Recrystallization ◽  
Hot Deformation ◽  
Low Carbon Steel ◽  
Hot Compression ◽  
Low Carbon ◽  
Compression Tests ◽  
Or Groups ◽  
Well Development ◽  
Average Size

Dynamic recrystallization (DRX) of ferrite in a low carbon steel with the (α+θ) duplex microstructures was investigated using hot compression tests in combination with SEM, TEM and EBSD, and the effect of the size of cementite particles was analyzed. The results indicated that during hot deformation of the low carbon steel DRX of ferrite took place and the increase in the average size of cementite particles was of benefit to DRX. The formation of DRX grains was attributed to particle stimulated nucleation (PSN), by the well development of the subgrain near cementite particles. At the beginning of hot deformation, DRX grains were mainly formed near cementite particles with the size of about 1μm or above. With the increase in the strain, such grains were also formed around pairs or groups of particles with the size of 0.5μm to 1μm.

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