Preparation and Performance under Corrosive Environment of Epoxy-Nanocomposite

2007 ◽  
Vol 353-358 ◽  
pp. 2167-2170 ◽  
Author(s):  
N. Abacha ◽  
M. Kubouchi ◽  
K. Tsuda ◽  
T. Sakai
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Immersion Time ◽  
Acid Corrosion ◽  
Epoxy Composites ◽  
Corrosive Environment ◽  
Epoxy Nanocomposite ◽  
Sulfuric Acid Corrosion ◽  
And Performance ◽  
Mechanical Performances

Epoxy-organoclay nanocomposite were prepared and investigated in terms of mechanical properties and also in term of water diffusion and sulfuric acid corrosion resistance. Diffusion was studied through epoxy samples containing up to 6phr of organically treated montmorillonite. The diffusion of the environmental solution was measured by immersion of the samples in these solutions at elevated temperature with noting the increase in weight as immersion function of time. An evaluation by flexural strength of the nanoclay/epoxy composites samples was made to compare their mechanical performances under corrosive environment as a function of immersion time and temperature.

scholarly journals Resistance to Sulfuric Acid Corrosion of Geopolymer Concrete Based on Different Binding Materials and Alkali Concentrations

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7109
Author(s):  
Wei Yang ◽  
Pinghua Zhu ◽  
Hui Liu ◽  
Xinjie Wang ◽  
Wei Ge ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Corrosion Resistance ◽  
Sulfuric Acid ◽  
Fly Ash ◽  
Acid Corrosion ◽  
Geopolymer Concrete ◽  
High Calcium ◽  
High Calcium Fly Ash ◽  
Naoh Solution ◽  
Sulfuric Acid Corrosion

Geopolymer binder is expected to be an optimum alternative to Portland cement due to its excellent engineering properties of high strength, acid corrosion resistance, low permeability, good chemical resistance, and excellent fire resistance. To study the sulfuric acid corrosion resistance of geopolymer concrete (GPC) with different binding materials and concentrations of sodium hydroxide solution (NaOH), metakaolin, high-calcium fly ash, and low-calcium fly ash were chosen as binding materials of GPC for the geopolymerization process. A mixture of sodium silicate solution (Na2SiO3) and NaOH solution with different concentrations (8 M and 12 M) was selected as the alkaline activator with a ratio (Na2SiO3/NaOH) of 1.5. GPC specimens were immersed in the sulfuric acid solution with the pH value of 1 for 6 days and then naturally dried for 1 day until 98 days. The macroscopic properties of GPC were characterized by visual appearance, compressive strength, mass loss, and neutralization depth. The materials were characterized by SEM, XRD, and FTIR. The results indicated that at the immersion time of 28 d, the compressive strength of two types of fly ash-based GPC increased to some extent due to the presence of gypsum, but this phenomenon was not observed in metakaolin-based GPC. After 98 d of immersion, the residual strength of fly ash based GPC was still higher, which reached more than 25 MPa, while the metakaolin-based GPC failed. Furthermore, due to the rigid 3D networks of aluminosilicate in fly ash-based GPC, the mass of all GPC decreased slightly during the immersion period, and then tended to be stable in the later period. On the contrary, in metakaolin-based GPC, the incomplete geopolymerization led to the compressive strength being too low to meet the application of practical engineering. In addition, the compressive strength of GPC activated by 12 M NaOH was higher than the GPC activated by 8 M NaOH, which is owing to the formation of gel depended on the concentration of alkali OH ion, low NaOH concentration weakened chemical reaction, and reduced compressive strength. Additionally, according to the testing results of neutralization depth, the neutralization depth of high-calcium fly ash-based GPC activated by 12 M NaOH suffered acid attack for 98 d was only 6.9 mm, which is the minimum value. Therefore, the best performance was observed in GPC prepared with high-calcium fly ash and 12 M NaOH solution, which is attributed to gypsum crystals that block the pores of the specimen and improve the microstructure of GPC, inhibiting further corrosion of sulfuric acid.

Biogenic sulfuric acid corrosion resistance of new artificial reef concrete

2018 ◽  
Vol 158 ◽  
pp. 33-41 ◽  
Author(s):  
Yu Yang ◽  
Tao Ji ◽  
Xujian Lin ◽  
Caiyi Chen ◽  
Zhengxian Yang
Keyword(s):  
Corrosion Resistance ◽  
Sulfuric Acid ◽  
Acid Corrosion ◽  
Artificial Reef ◽  
Sulfuric Acid Corrosion

The Mechanical Properties of PSA Fibers after Corrosion

2010 ◽  
Vol 146-147 ◽  
pp. 221-224
Author(s):  
Xin Yan Yuan ◽  
Heng Gen Shen ◽  
Zhen Hua Wang ◽  
Wei Li Hou
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Breaking Strength ◽  
Retention Rate ◽  
Acid Corrosion ◽  
Strong Acid ◽  
Elongation Rate ◽  
Scanning Electron ◽  
Better Than ◽  
Made In

In order to reveal the influence of acidic gas SO2 and CaO etc alkali substances which are contained in industrial furnaces smoke to the strength of PSA fiber, tests are made in different acid and alkali conditions, and the changes of its surface morphology were observed by scanning electron microscope (SEM). The results show that: PSA has better acid corrosion resistance than alkali corrosion resistance. Its acid corrosion resistance is similar to the domestic aramid. PSA is better than Nomex in the concentration of 5% H2SO4. Its alkali corrosion resistance is worse than domestic aramid. The retention rate of breaking strength drop to 60.80% and 69.52% respectively after treated in the concentration of 5% H2SO4 for 48 hours and in the concentration of 5% NaOH for 4 hours. The elongation rate decline to 68.14% and 40.22% respectively, and the elongation rate fell to 68.14% and 40.22% respectively. Therefore, the PSA must be dealt against corrosion when used in strong acid or alkali environment.

Study on Properties of Al2TiO5 Coating on Ti-6Al-4V Titanium Alloy

2013 ◽  
Vol 575-576 ◽  
pp. 348-351
Author(s):  
Nian Suo Xie ◽  
Jin Wang
Keyword(s):  
Corrosion Resistance ◽  
Titanium Alloy ◽  
Sulfuric Acid ◽  
High Temperature ◽  
Oxidation Resistance ◽  
High Temperature Oxidation ◽  
Acid Corrosion ◽  
Temperature Oxidation ◽  
Micro Arc Oxidation ◽  
Sulfuric Acid Corrosion

The Al2TiO5Coating was deposited on Ti-6Al-4V alloy substrate by homemade micro-arc oxidation system. The microstructure of Ti-6Al-4V titanium alloy, the phase of coating, the bonding force of the coating and matrix, sulfuric acid corrosion resistance and high-temperature oxidation resistance were study by inverted microscope model, Xray diffract meter, scanning electron microscopy, the coating adhesion automatic scratch tester, box-type furnace. The results show that the phase of coating is composed of Al2TiO5and Al2SiO5, and Al2TiO5.is the main component, the coating surface consists of discharging pit and flange which are unequal in size, rough and overlap and micro-arc oxidation pit diameter increases with the voltage. When micro-arc oxidation voltage is constant, the longer micro-arc oxidation time, the greater the Ti-6Al-4V alloy coating and the substrate binding force. The corrosion resistance of Ti-6Al-4V alloy was improved in sulfuric acid due to micro-arc oxidation; the sulfuric acid corrosion resistance of the coated samples was improved 11 times when the micro-arc oxidation time increased from 5min to 60min. the high-temperature oxidation resistance of Ti-6Al-4V alloy with micro-arc oxidation coatings is higher than Ti-6Al-4V alloy without micro-arc oxidation coating.

NAS 255

Alloy Digest ◽  
2010 ◽  
Vol 59 (4) ◽  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Sulfuric Acid ◽  
Physical Properties ◽  
Tensile Properties ◽  
Acid Corrosion ◽  
Heat Treating ◽  
Custom Made ◽  
Sulfuric Acid Corrosion

Abstract With excellent resistance to sulfuric acid corrosion, NAS 255 (UNS N08904) is a stainless steel custom-made for resisting reducing acids. The alloy is available in flat products. 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, and joining. Filing Code: SS-1061. Producer or source: Nippon Yakin Kogyo Company Ltd.

scholarly journals Immersion Behavior of Carbon Steel, Phosphate Carbon Steel and Phosphate and Painted Carbon Steel in Saltwater

Materials ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 188
Author(s):  
Costica Bejinariu ◽  
Diana-Petronela Burduhos-Nergis ◽  
Nicanor Cimpoesu
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Carbon Steel ◽  
Polarization Resistance ◽  
Immersion Time ◽  
Electrochemical Impedance ◽  
Petroleum Industry ◽  
Paint Layer ◽  
Corrosion Process ◽  
Paper Study

The carbon steel is used in many areas due to its good mechanical properties; however, its low corrosion resistance presents a very important problem, for example, when carbon steel carabiners are used in the petroleum industry or navy, the possibility of an accident is higher due to carabiner failure. This phenomenon could occur as a consequence of the corrosion process which negatively affects mechanical properties. This paper study the possibility to improve its corrosion resistance by depositing on its surface a phosphate layer and a paint layer, and also aims to analyze the immersion behavior in saltwater of carbon steel, phosphate carbon steel, and phosphate and painted carbon steel. According to this study, by coating the carbon steel with a phosphate or paint layer, a higher polarization resistance is obtained in saltwater. Moreover, by electrochemical impedance spectroscopy (EIS), it was observed that the corrosion rate decreases with the increase of the immersion time. Meanwhile scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) revealed that the main compounds which formed on the sample’s surface were iron oxides or hydroxy-oxides, after immersion for a longer period. The overall results show that all types of deposited layers increase the corrosion resistance of C45 steel.

MULTISCALE ANALYSIS OF THERMO-MECHANICAL BEHAVIOR OF BORON NITRIDE-REINFORCED EPOXY NANOCOMPOSITES

2021 ◽  
Author(s):  
OLANREWAJU ALUKO ◽  
S. GOWTHAM ◽  
EVAN J. PINEDA ◽  
GREGORY M. ODEGARD
Keyword(s):  
Mechanical Properties ◽  
Multiscale Analysis ◽  
Epoxy Composites ◽  
Length Scale ◽  
Epoxy Nanocomposites ◽  
Remarkable Effect ◽  
Multi Scale ◽  
Aspect Ratios ◽  
Material Systems ◽  
Mechanical Performances

The effect of size, shape, morphology, and arrangement of micro constituents of Boron Nitrite (BN) nanoplatelet/epoxy composites on their properties were investigated using a multi scale approach that includes Molecular Dynamics (MD) and micromechanics. The thermo-mechanical properties of the composites were evaluated using molecular theory and the analysis showed that the elastic constants of BN/epoxy composites were not severely affected by temperature. Also, the micromechanical analysis of Generalized Method of Cells (GMC) was utilized at higher length scale to evaluate elastic properties of the composites, for different geometries and arrangements of micro constituents. The predicted results of the analysis showed that the size, aspect ratios, morphology, and the arrangements of inclusions in BN/epoxy nanocomposites all have remarkable effect on the mechanical performances of the material systems.

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