In the study organic-inorganic hybrid composite, epoxy modified silicone coating and vinyl ester flake mastic were comparatively used as several anti-corrosion materials that provided protection for flue gas desulfu-rization (FGD). The relationship between curing conversion rate of hybrid polymer and temperature was investigated by differential scanning calorimeter (DSC). The adhesion strength, coefficient of thermal expansion and flame retardant properties of three anti-corrosion materials were measured and analyzed. A corrosion test in 8% H<sub>2</sub>SO<sub>4</sub> and 5% HCl at temperature cycle of 40°C~ 160°C was applied to study corrosion resistance of several anti-corrosion materials. Gravimetric measurement and morphological observation of three materials before and after corrosion test were comparatively analyzed in the paper. The small weight change and good morphological structure of hybrid composite during corrosion test demonstrate that hybrid composite has better anti-corrosion properties than epoxy modified silicone coating and vinyl ester flake mastic
Abstract:The effect of tert-butyl hydroperoxide-sodium pyrosulfite ((CH 3 ) 3 COOH-Na 2 S 2 O 5 ) as an initiator system in H 2 O 2 -based slurry was investigated for the abrasive-free polishing (AFP) of a hard disk substrate. The polishing results show that the H 2 O 2 -C 4 H 10 O 2 -Na 2 S 2 O 5 slurry exhibits a material removal rate (MRR) that is nearly 5 times higher than that of the H 2 O 2 slurry in the AFP of the hard disk substrate. In addition, the surface polished by the slurry containing the initiator exhibits a lower surface roughness and has fewer nano-asperity peaks than that of the H 2 O 2 slurry. Further, we investigate the polishing mechanism of H 2 O 2 -C 4 H 10 O 2 -Na 2 S 2 O 5 slurry. Electron spin-resonance spectroscopy and auger electron spectrometer analyses show that the oxidizing ability of the H 2 O 2 -C 4 H 10 O 2 -Na 2 S 2 O 5 slurry is much greater than that of the H 2 O 2 slurry. The results of potentiodynamic polarization measurements show that the hard disk substrate in the H 2 O 2 -C 4 H 10 O 2 -Na 2 S 2 O 5 slurry can be rapidly etched, and electrochemical impedance spectroscopy analysis indicates that the oxide film of the hard disk substrate formed in the H 2 O 2 -C 4 H 10 O 2 -Na 2 S 2 O 5 slurry may be loose, and can be removed easily during polishing. The better oxidizing and etching ability of H 2 O 2 -C 4 H 10 O 2 -Na 2 S 2 O 5 slurry leads to a higher MRR in AFP for hard disk substrates.
Concrete cracking caused by steel corrosion is the main form of concrete structure deterioration at present. In order to solve the problem of steel corrosion, people begin to seek to replace steel with corrosion-resistant materials. Fiber reinforced polymer (FRP) has the advantages of high strength to mass ratio, good fatigue resistance, simple construction, corrosion resistance, etc., and has been widely used in engineering in recent years. In this paper, it analyzes the research status of FRP composites and introduces the properties of different kinds of FRP composites in detail. Then, by comparing with ordinary steel bar, the advantages of steel bar containing FRP material are highlighted. Subsequently, the durability of FRP composite materials in corrosion environment is studied. Finally, this paper introduces the practical application of FRP composites in engineering. The results are helpful to popularize the application of FRP composites in practical engineering.
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