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Showing 1 to 20 of 111 for “"corrosion rate"”.
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The effect of cyclic wetting and drying on the corrosion rate of steel in reinforced concrete
Preventing chloride-induced reinforcement corrosion in marine concrete structures remains a concern for structural engineers. Marine structures are typically exposed to high chloride concentrations through direct exposure to sea water, which provides the primary conditions required for …
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Effect of a Simulated Butterfly Valve on the Erosion-Corrosion Rate of Nickel Aluminum Bronze Alloys in Highly Turbulent Seawater
… and maritime applications for their excellent corrosion resistance under the influence of seawater. One application involves the use of a NAB butterfly valve within a NAB fluid line to control fluid flow of seawater. Due to the chaotic environment, the corrosion rate of the NAB tubing …
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Effect of oxygen availability on the corrosion rate of reinforced concrete in marine exposure zones: inference from site and lab studies
Corrosion of steel in reinforced concrete structures is a large problem facing engineers today. The marine environment is considered to be the most severe owing to the high levels of chlorides available, and so structures located here are particularly vulnerable to chloride attack and chloride …
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The development of empirical chloride-induced corrosion rate prediction models for cracked and uncracked steel reinforced concrete structures in the marine tidal zone
Empirical chloride-induced corrosion rate prediction models for cracked and uncracked reinforced concrete (RC) structures in the marine tidal exposure zone are proposed in this study. The data used to develop the models were obtained from parallel corrosion experiments carried out by exposing half …
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A time to cracking model for critically contaminated reinforced concrete structures
In addressing the need for a site specific corrosion model for concrete structures, Bazant’s time to first cracking model was used as the basis for an experimental research study. The theoretical model, which expresses the time to first cracking as a function of the corrosion rate and physical …
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A parametric investigation on the influence and inhibition performance on CO2 corrosion of carbon steel
The deposition of hydrate and corrosion in the pipeline remain a major challenge in the petroleum industry. Internal corrosion slows and decreases the production of oil and gas when associated with free water and reacts with organic acid. Experiments had shown that the corrosion products (ferrous …
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Automated Monitoring of Metal Corrosion for Water Delivery Infrastructure
The real-time corrosion rate of mild steel in drinking water and the properties of that water are measured and recorded in time using a newly build computed automated system. A non-destructive electrochemical method is used to find the corrosion rate (CR) of mild steel coupons in time and these are …
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Materials testing and development of functionally graded composite fuel cladding and piping for the Lead-Bismuth cooled nuclear reactor
… enable the Pb-Bi eutectic cooled reactors to operate at temperatures up to 650-700°C. This new technology is a functionally graded composite steel which resists high temperature LBE corrosion. This composite steel consists of a Fel2Cr2Si protective layer weld overlaid on a T91 steel and then …
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Corrosion of steel reinforcement in concrete. Corrosion of mild steel bars in concrete and its effect on steel-concrete bond strength.
This thesis reports on the research outcome of corrosion mechanism and corrosion rate of mild steel in different environments (saline, alkaline solutions and concrete media) using potentiodynamic polarization technique. The study also included the effect of corrosion on bond strength between …
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Modeling the Time-to Corrosion Cracking of the Cover Concrete in Chloride Contaminated Reinforced Concrete Structures
Significant factors on steel corrosion in chloride contaminated reinforced concrete and time-to-corrosion cracking were investigated in this study. Sixty specimens were designed with seven admixed chloride contents, three concrete cover depths, two reinforcing steel bar diameters, two exposure …
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Discrete sacrificial anodes and their use in service life extension of chloride contaminated reinforced concrete structures
… relies on the application of patch repairs and corrosion inhibitors while other potentially successful methods such as sacrificial anodes are rarely applied. Sacrificial anode cathodic protection (SACP) systems use metals that are higher than steel in the electrochemical series. These metals …
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Corrosion Behaviors of Coated Aluminum Alloys in Simulated Corrosive Environment
<p>This study investigated the corrosion of an aluminum alloy with and without coatings under simulated corrosive environments. Coatings were selected and applied from commercial materials and techniques, consisting of microceramic, epoxy primer, and topcoat. The experiments for coated specimens …
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Effect of plastic strain on the corrosion of X65 pipeline steel
Corrosion is an important mode of degradation and failure for iron alloys used in oil and gas pipelines. Pitting corrosion is a particular type of corrosion that is not well-understood and can play in important role in material failure. Research has shown that areas of increased plastic strain …
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Multiphase Flow Effects on Naphthenic Acid Corrosion of Carbon Steel
… units. Previous studies have shown that NAP corrosion is particularly aggressive in the presence of a liquid phase at the metal surface. Although the effect of flow was previously assessed in single-phase flow conditions, a high velocity multiphase flow has been suggested to occur in the …
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Galvanic Corrosion of Aluminum/Carbon Composite Systems
… composites (CFRP) are typically considered corrosion resistant when used alone, but can develop severe galvanic corrosion when in physical contact in the same component or structure.</p> <p>General engineering practice is to avoid contact between aluminum and CFRP in any application where …
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In-vitro characterization of boronized titanium alloy by means of corrosion and electrochemical impedance spectroscopy methods in simulated body fluids
… titanium's wear resistance and also improves corrosion resistance. The target of this research was to characterize the corrosion characteristics of both unboronized and boronized titanium using both electrochemical corrosion methods and Electrochemical Impedance Spectroscopy (ELS) in simulated …
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Sulfide stress cracking resistance of API-X100 high strength low alloy steel in H2S environments
… "A" solution is a hydrogen sulfide (H2S) saturated solution containing 5.0 wt.% sodium chloride (NaC1) and 0.5 wt.% acetic acid (CH3COOH). The aim of this thesis was to study the effect of microstructure, non-metallic inclusions and alloying elements of the X100 on H2S corrosion and SSC …
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Surfactant aspects of corrosion inhibition
… with investigating the surfactant aspects of corrosion inhibition. Corrosion inhibitors are of great industrial importance because they are a relatively inexpensive and easily applicable method of protecting oil pipelines against internal corrosion. The performance of corrosion inhibitors is …
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The Effects of Laser Shock Peening on the Residual Stress and Corrosion Characteristics of Magnesium Alloy AZ91D for use as Biodegradable Implants
… that are very similar to bone. However, the high corrosion rate of magnesium and its alloys while immersed in body fluid restrict the material from use as permanent implants. The ability to control the corrosion rate of a material is an important factor in the development of biodegradable …
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Stress corrosion cracking behavior of friction stir processed ultrafine grained light metal alloys
… a microstructural modification tool, on the corrosion behavior of Al-Mg, Al-Mg-Sc, Mg-Al-Zn and Mg-Y-RE alloys has been studied. An attempt has been made to establish correlation between processing parameters and the subsequent microstructural evolution especially matrix grain size on the …
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