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Items from 1 to 20 out of 13,867 results

article

Defects in epoxy‐coated reinforcement and their impact on the service life of a concrete structure

Sylvia Keßler, Ueli Angst, Marc Zintel, Christoph Gehlen

Structural Concrete > 16 > 3 > 398 - 405

Epoxy‐coated reinforcement (ECR) as a means of protection against chloride‐induced corrosion of steel in concrete is used in only a few countries due to doubts concerning its effectiveness. A common misconception is that possible defects in the coating are particularly weak points as these might favour high local corrosion rates and thus loss of steel cross‐section. This work discusses why a certain...

article

Cerium-based sealing of PEO coated AM50 magnesium alloy

M. Mohedano, C. Blawert, M.L. Zheludkevich, M. Mohedano, more

Surface & Coatings Technology > 2015 > 269 > Complete > 145-154

Environmentally friendly Ce-based sealing post-treatments were developed for PEO coatings on AM50 magnesium alloy. The influence of the Ce(NO ₃ ) ₃ concentration in the Ce bath and the time of the sealing process were evaluated in terms of morphological and structural properties using SEM, EDS and XRD. Ce content in the layer increased with both the amount of salt in the solution and...

article

A methodology for identifying and addressing dead-legs and corrosion issues in a Process Hazard Analysis (PHA)

René Murata, Janet Benaquisto, Cecily Storey, R. Murata, more

Journal of Loss Prevention in the Process Industries > 2015 > 35 > Complete > 387-392

Identifying dead-legs and related corrosion issues continues to be a challenge in the process industry. Pipeline corrosion has been a factor in several recent incidents involving releases and fires. A review of incident reports and citations over the past ten years indicates that Process Hazard Analysis (PHA) revalidations have been noted for not addressing the hazards of a process including corrosion...

article

Properties of seawater with ice slurry use in focus

A. Melinder, M. Ignatowicz

International Journal of Refrigeration > 2015 > 52 > Complete > 51-58

Seawater is the most common fluid on earth and ice generating machines are increasingly used on fishing vessels to produce ice slurry from seawater with up to 60% ice to be poured over the catch. In this study, a literature search has been made to establish physical property data of seawater as function of salinity and temperature. Ice slurry properties of seawater have been generated and are presented...

article

Implementation of Different Techniques for Monitoring the Corrosion of Rebars Embedded in Concretes Made with Ordinary and Pozzolanic Cements

D.R. Vazquez, Y.A. Villagrán Zaccardi, C.J. Zega, M.E. Sosa, more

Procedia Materials Science > 2015 > 8 > Complete > 73-81

For the development of an intermediate radioactive waste repository, two different types of reinforced concrete were analyzed in terms of durability: one made with ordinary portland cement and the other one made with pozzolanic cement. The values for compressive strength, sorptivity and air permeability demonstrate that the formulations are compatible with the required application. The corrosion rate...

article

Effect of Thinning Additives in Ceramic Slips on the Corrosion of Gypsum Molds

Yu. N. Kryuchkov, T. L. Neklyudova

Glass and Ceramics > 2015 > 72 > 1-2 > 61-63

The effect of different thinning agents on the corrosion of gypsum molds is investigated. It is shown that a more than two-fold reduction of the surface corrosion of samples is possible when using phosphate thinners. This will increase the service life of molds and make ceramic manufacture economically more efficient.

article

Corrosion Behaviour of a SiOxNy Coated and Nitrided PH Stainless Steel

Eugenia L. Dalibon, Mauro Moscatelli, Silvia Simison, Lisandro Escalada, more

Procedia Materials Science > 2015 > 8 > Complete > 29-38

Precipitation hardening stainless steels are used in applications where wear and corrosion resistance are required. To improve the surface properties, thermochemical treatments in combination with hard coatings can be used. In this work, the corrosion behaviour of SiOxNy coatings deposited on nitrided and non-nitrided Corrax(R) PH stainless steel were evaluated comparing them with the behaviour of...

article

Metallic implant biomaterials

Qizhi Chen, George A. Thouas, Q. Chen, G.A. Thouas

Materials Science & Engineering R > 2015 > 87 > Complete > 1-57

Human tissue is structured mainly of self-assembled polymers (proteins) and ceramics (bone minerals), with metals present as trace elements with molecular scale functions. However, metals and their alloys have played a predominant role as structural biomaterials in reconstructive surgery, especially orthopedics, with more recent uses in non-osseous tissues, such as blood vessels. With the successful...

article

Corrosion resistance of niobium carbide coatings produced on AISI 1045 steel via thermo-reactive diffusion deposition

Alejandro OrjuelaG., Rosa Rincón, John Jairo Olaya, A. OrjuelaG., more

Surface & Coatings Technology > 2014 > 259 > Part C > 667-675

Niobium carbide coatings were deposited on AISI 1045 low alloy steel via the thermo-reactive deposition/diffusion technique (TRD). The influence of the percentage of the ferroalloy on the corrosion resistance of each coating was evaluated. The corrosion resistance of the niobium carbide coatings was evaluated using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) in a...

article

Electrodeposited free-crack NiW films under super gravity filed: Structure and excellent corrosion property

Mingyong Wang, Zhi Wang, Zhancheng Guo, M. Wang, more

Materials Chemistry and Physics > 2014 > 148 > 1-2 > 245-252

The anti-corrosion ability of electrodeposited metal films depends on surface structure of films. In this paper, NiW films with or without cracks were electrodeposited by using super gravity field. The structure and corrosion behavior (corrosion resistance and long-term stability) of NiW films were characterized and studies by SEM, XRD, EDS, Tafel and electrochemical impedance spectroscopy (EIS)....

article

In vitro and in vivo corrosion measurements of Mg–6Zn alloys in the bile

Yigang Chen, Jun Yan, Zhigang Wang, Song Yu, more

Materials Science & Engineering C > 2014 > 42 > Complete > 116-123

Mg–6Zn alloy was studied as candidate biodegradable metallic implants for the common bile duct (CBD) in terms of its in vitro corrosion and in vivo corrosion. Electrochemical measurements, immersion tests and hydrogen evolution were performed in the bile and Hanks' solution to evaluate the in vitro degradation behavior of Mg–6Zn alloy. The results showed that the degradation rate and hydrogen evolution...

article

Effect of nano-TiO2 particles size on the corrosion resistance of alkyd coating

M.A. Deyab, S.T. Keera, M.A. Deyab, S.T. Keera

Materials Chemistry and Physics > 2014 > 146 > 3 > 406-411

The coating system containing various sizes (∼10, 50, 100, 150 nm) of nano-TiO ₂ were prepared and investigated for corrosion protection of carbon steel in 1.0 M H ₂ SO ₄ using polarization, EIS and transmission electron microscopy (TEM) techniques. It was found that nano-TiO ₂ particles improved the corrosion resistance of alkyd coatings. The corrosion resistance occurs...

article

Heat treatment of 7xxx series aluminium alloys—Some recent developments

Paul A. ROMETSCH, Yong ZHANG, Steven KNIGHT, P.A. ROMETSCH, more

Transactions of Nonferrous Metals Society of China > 2014 > 24 > 7 > 2003-2017

The 7xxx series alloys are heat treatable wrought aluminium alloys based on the Al-Zn-Mg(-Cu) system. They are widely used in high-performance structural aerospace and transportation applications. Apart from compositional, casting and thermo-mechanical processing effects, the balance of properties is also significantly influenced by the way in which the materials are heat-treated. This paper describes...

article

Corrosion of carbon steel by bacteria from North Sea offshore seawater injection systems: Laboratory investigation

Marko Stipanicev, Florin Turcu, Loïc Esnault, Omar Rosas, more

Bioelectrochemistry > 2014 > 97 > Complete > 76-88

Influence of sulfidogenic bacteria, from a North Sea seawater injection system, on the corrosion of S235JR carbon steel was studied in a flow bioreactor; operating anaerobically for 100days with either inoculated or filtrated seawater. Deposits formed on steel placed in reactors contained magnesium and calcium minerals plus iron sulfide. The dominant biofilm-forming organism was an anaerobic bacterium,...

article

Microbiological and abiotic processes in modelling longer-term marine corrosion of steel

Robert E. Melchers, R.E. Melchers

Bioelectrochemistry > 2014 > 97 > Complete > 89-96

Longer term exposure of mild steel in natural (biotic) waters progresses as a bimodal function of time, both for corrosion mass loss and for pit depth. Recent test results, however, found this also for immersion in clean fresh, almost pure and triply distilled waters. This shows chlorides or microbiological activity is not essential for the electrochemical processes producing bimodal behaviour. It...

article

Inhibitory and bactericidal action of the biocorrosion agents «INCORGAS» and «AMDOR»

L.E. Tsygankova, V.I. Vigdorovich, M.N. Esina, T.N. Nazina, more

Bioelectrochemistry > 2014 > 97 > Complete > 154-161

Inhibiting action of A, B and M-X compositions against hydrosulfide corrosion of carbon steel, hydrogen diffusion through the steel membrane has been studied along with their bactericidal effect with respect to sulfate-reducing bacteria of Desulfomicrobium type. Bactericidal properties of the compositions have been studied in the Postgate medium.Corrosion tests have been made in the NACE medium saturated...

article

An approach for the delineation of a generic cut-off value for local respiratory tract irritation by irritating or corrosive substances as a pragmatic tool to fulfill REACH requirements

H. Messinger, H. Messinger

Regulatory Toxicology and Pharmacology > 2014 > 68 > 3 > 317-324

Under the current European legislation for the Registration, Evaluation, Authorisation and restriction of Chemicals (REACHs) a Derived No Effect Level (DNEL) has to be delineated for acute and chronic inhalation effects. The majority of available experimental studies are performed by the oral route of exposure. Route to route extrapolation poses particular problems for irritating or corrosive substances...

article

In situ scanning tunneling microscopy study of the intergranular corrosion of copper

E. Martinez-Lombardia, L. Lapeire, V. Maurice, I. De Graeve, more

Electrochemistry Communications > 2014 > 41 > Complete > 1-4

Electrochemical scanning tunneling microscopy is proved to be a powerful tool for providing valuable topographic information to study in situ the local corrosion properties of polycrystalline materials. It was applied to analyze the susceptibility to intergranular corrosion of different types of grain boundaries of microcrystalline copper in HCl and combined with electron backscatter diffraction to...

article

Corrosion inhibition efficiency of water soluble ethoxylated trimethylol propane by gravimetric analysis

A.A. Abdel-Azim, R. Milad, R. El-Ghazawy, R. Kamal, more

Egyptian Journal of Petroleum > 2014 > 23 > 1 > 15-20

Polyoxyethylenated trimethylol propane monolaurate surfactants with varied ethylene oxide content were tested as corrosion inhibitors via the weight loss method. Weight loss measurements for carbon steel dissolution were performed in 1N HCl containing different inhibitor concentrations at 30, 40 and 50°C. These measurements were utilized for calculating corrosion rate, surface coverage area and percentage...

article

Autocatalytic duplex Ni–P/Ni–W–P coatings on AZ31B magnesium alloy

V. Ezhil Selvi, Purba Chatterji, S. Subramanian, J.N. Balaraju, more

Surface & Coatings Technology > 2014 > 240 > Complete > 103-109

Autocatalytic duplex Ni–P/Ni–W–P coatings were deposited on AZ31B magnesium alloy using stabilizer free nickel carbonate bath. Some of the coated specimens were passivated in chromate solution with and without heat treatment. Plain Ni–P coatings were also prepared for comparison. Coatings were characterized for their surface morphology, composition and corrosion resistance. Energy dispersive analysis...

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Search results

Defects in epoxy‐coated reinforcement and their impact on the service life of a concrete structure

Cerium-based sealing of PEO coated AM50 magnesium alloy

A methodology for identifying and addressing dead-legs and corrosion issues in a Process Hazard Analysis (PHA)

Properties of seawater with ice slurry use in focus

Implementation of Different Techniques for Monitoring the Corrosion of Rebars Embedded in Concretes Made with Ordinary and Pozzolanic Cements

Effect of Thinning Additives in Ceramic Slips on the Corrosion of Gypsum Molds

Corrosion Behaviour of a SiOxNy Coated and Nitrided PH Stainless Steel

Metallic implant biomaterials

Corrosion resistance of niobium carbide coatings produced on AISI 1045 steel via thermo-reactive diffusion deposition

Electrodeposited free-crack NiW films under super gravity filed: Structure and excellent corrosion property

In vitro and in vivo corrosion measurements of Mg–6Zn alloys in the bile

Effect of nano-TiO2 particles size on the corrosion resistance of alkyd coating

Heat treatment of 7xxx series aluminium alloys—Some recent developments

Corrosion of carbon steel by bacteria from North Sea offshore seawater injection systems: Laboratory investigation

Microbiological and abiotic processes in modelling longer-term marine corrosion of steel

Inhibitory and bactericidal action of the biocorrosion agents «INCORGAS» and «AMDOR»

An approach for the delineation of a generic cut-off value for local respiratory tract irritation by irritating or corrosive substances as a pragmatic tool to fulfill REACH requirements

In situ scanning tunneling microscopy study of the intergranular corrosion of copper

Corrosion inhibition efficiency of water soluble ethoxylated trimethylol propane by gravimetric analysis

Autocatalytic duplex Ni–P/Ni–W–P coatings on AZ31B magnesium alloy

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