Papers by Keyword: Anticorrosion

Abstract: Nowadays, nanomaterials have become the research hot topic by the virtue of their fascinating attributions in human civilization. Zinc phosphate nanoparticles (ZnPNPs), an inorganic material, possess some unique features, such as high thermal stability, low solubility in corrosive media, biocompatibility, non-toxicity and luminescence property. As a result, ZnPNPs have enormously been explored by researchers in many important applications, such as anticorrosion pigment, drug delivery, antibacterial as well as anticancer agents, biocatalyst, lubricant additives, regeneration of bone tissues and removal of toxic metal from the environmental samples, and so on. Considering diversified applications potential, morphologically different ZnPNPs have mainly been fabricated by precipitation, sonochemical and biological methods. The surface property of ZnPNPs differs with pH, temperature, reaction time, and substrate concentrations. One-step in situ and facile synthetic procedures, as well as greener synthesis protocols of ZnPNPs can be advantageous over conventional methods to eliminate toxic chemicals and by-products. In addition, both artificial and natural polymer-modified ZnPNPs would offer improved properties, such as better colloidal stability, option for further functionalization, and render desired biocompatibility of prepared hybrid nanocomposite particles in applying for targeted applications. Furthermore, both in vitro and in vivo studies of polymer functionalized ZnPNPs can be an attractive research topic in biotechnological and electrochemical fields. Therefore, the current review provides a summary of the recent progress on the fabrication methods, an opportunity for the future directions to the researchers in the improvement of shape-selective synthesis and application potentials of ZnPNPs.

Abstract: The anticorrosion performance of Al2024 deposited ZSM-5 zeolite membranes prepared by situ hydrothermal method is analyzed. The results of polarization curve show that the corrosion position of Al2024 deposited zeolite membranes was higher than blank samples and the samples position at 10 h was highest. The impandance rings of samples at 10 h was biggest and the corrosion charact was uniform corrosion different from pit corrosion of Al2024 without zeolite membranes.

Abstract: The first generation beach cleaner SWQ18 is mainly made of carbon steel and the unloaded weight is heavy. In the beach test, it occurred such problems as a high fuel consumption and the wheels tend to sink in sand. From the perspective of lightweight material, based on RADIOSS Finite Element Analysis (FEA) module in Hyperworks, the auto-body’s FE model was built. By setting the material as 6061 aluminium alloy and analyzing its body stress and modal, considered the problems that how the aluminium alloy resist the corrosion from the sea atmosphere and its stiffness and strength as well, the result shows that 6061 satisfies the operating requirements and is applicable to the beach cleaner body and a feasible lightweighting scheme taking cost and performance in account was reached.

Abstract: Introduced the current situation at home and abroad pipeline anticorrosion technology, commonly used in the melting epoxy powder, adhesive tape, anticorrosion, multilayer structure coal tar epoxy, polyurethane extruded polyethylene anticorrosion technology. High performance synthetic resin, filler, pigment, anticorrosion material will have greater development, along with the application of pipeline anticorrosion technology in construction, chemical, oil and other industries, the pipeline anticorrosion technology will have larger development space.

Abstract: SnO₂ coatings were supplied on the surface of 304 stainless steel (304SS) by a sol-gel process followed by hydrothermal treatments at different reaction temperature and time, respectively. The effects of hydrothermal temperature and time in pure water on the anticorrosion performances of the SnO₂ films in simulated proton exchange membrane fuel cells (PEMFC) environments were investigated by potentiodynamic polarization curves, open circuit potential-time curves and electrochemical impedance spectroscopy (EIS). It was found that the SnO₂ coated 304SS via the hydrothermal treatment showed a better corrosion resistance than the sample without hydrothermal treatment and bare 304SS. The SnO₂ coated 304SS hydrothermally treated at 160°C for 3h showed the highest corrosion resistance among the samples. The results have been discussed in terms of surface structure of SnO₂ film and its anticorrosion performance in simulated PEMFC environments.

Abstract: High entropy alloys emerge as a new type of advanced metallic materials, which have received increasing attentions from material engineers around the world. In addition to high entropy effect based on equiatomic or near-equiatomic and containing five or more principal elements, they exhibit a cocktail effect resulting from interactions among all the elements and the indirect effects of the various elements on the performances. In this study, according to high entropy alloy design principles, corrosion-resistant elements such as Al, Ni, Cr and Mo were used to improve the anticorrosion property, Fe, Co, B and Si as solid solution elements were added to promote the formation of solid solutions with simple structure, and the wear-resisting property increased.

Abstract: Hydraulic engineering metal structures are susceptible to corrosion because of their chronically work in special environment. Water-borne inorganic zinc-rich coatings, owing to their excellent corrosion resistance and environmental performance, are suitable to be used in hydraulic engineering metal structures. In the paper, organic lotion and flaky zinc are used to upgrade the properties through modifying their filler and film. The experimental results show that the water-borne inorganic zinc-rich coatings with flaky zinc as filler and modified potassium silicate as film materials are provided with high durability and good mechanical character.

Abstract: In this paper the anticorrosion properties of steel bars coated with polymer modified cement-based coatings in chloride solution were evaluated. Then the pullout tests were conducted using coated and uncoated steel bars embedded in concrete specimens and the bond properties between concrete and bars were tested. The results show the steel bars coated with epoxy emulsion modified cement-based coating (HY) and elastic copolymer emulsion modified cement-based coating (GT) have satisfactory anticorrosion properties in 3.5% NaCl solution for 96h. But the pullout tests display that the bond strength between the concrete and the steel bars coated with GT coating is much lower than that of the bars coated with HY coating and the uncoated specimens. The bond stress between the concrete and the bars coated with pure acrylate emulsion modified cement-based (CB) coating is the highest among the three coatings, but the resistance to chloride permeability of CB coating is poor. The results indicate the special epoxy-cement-based coating (HY) is more suitable for applying to the anticorrosion coating for steel bars in chloride condition.

Abstract: This article, the preparation and corrosion protection studies of a series of electroactive epoxy titanium dioxide (EET) hybrid materials containing conjugated segments of electroactive amino-capped aniline trimer (ACAT) and titanium dioxide (TiO₂) nanoparticles of ~100 nm in diameter was first presented. It should be noted that EET at higher concentration of TiO₂ was found to reveal better corrosion protection effect as compared to neat electroactive epoxy coating on cold-rolled steel (CRS) electrode based on electrochemical corrosion measurements in 3.5 wt% NaCl electrolyte. Effective enhancement of corrosion protection of EET coatings could be interpreted by electroactive epoxy as a densely physical barrier coating and the redox catalytic capabilities of ACAT units existed in EET may induce the formation of passive metal oxide layers on CRS electrode. Further the well-dispersed TiO₂ nanoparticles in EET matrix could act as effective hinder to enhance the oxygen barrier property of EET.

Abstract: Self-healing materials offer tremendous potential for providing long-lived structural materials. In this study, isophorone diisocyanate (IPDI) microcapsules as self-healing materials were synthesized via in situ polymerization. Thermogravimetric analysis characterized the thermal ability of IPDI, microcapsules and microcapsule shells. The morphology of microcapsules and microcapsule shells were characterized by FE-SEM. Scanning micro-reference electrode technique demonstrated that epoxy resin coatings with IPDI microcapsules on the surface of reinforcing steel Q235 could cure the scratched crevice by immersion in 0.01 M NaCl solution after the coating was scratched. The self-healing epoxy resin coating could protect Q235 from corrosion.