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Showing 1 to 20 of 20 for “"Corrosion Initiation"”.
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Pitting corrosion initiation in AISI 316 austenitic stainless steel
The initiation of pitting corrosion on AISI 316 stainless steel has been examined from a phenomenological viewpoint with emphasis on the role of the metal in this complex, interaction. A modified potentiodynamic technique was used to prepare specimens corresponding with a series of different points …
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Modeling the Time to Corrosion Initiation for Concretes with Mineral Admixtures and/or Corrosion Inhibitors in Chloride-Laden Environments
The application of a mineral admixture, or a corrosion inhibitor, or a combination of both are methods used for the corrosion protection for reinforced concrete bridges. The results of a study on evaluation of corrosion inhibitors from three different manufacturers and of concretes with fly ash, …
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The detection of crevice corrosion in titanium and its alloys through the use of potential monitoring
Conventional laboratory crevice corrosion testing requires approximately thirty days and is a simple go/no go test which does not indicate crevice incubation time and propagation. This study focuses on the effectiveness of potential monitoring to detect the onset of crevice corrosion and …
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Impact of Specification Changes on Chloride Induced Corrosion Service Life of Virginia Bridge Decks
… the statistical nature of factors affecting the corrosion process is developed. The model expands on an existing deterministic model using statistical computing techniques, including resampling techniques such as the parametric and simple bootstrap. Emphasis was placed on the diffusion portion of …
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Understanding Liquid-Air Interface Corrosion of Steel in Simplified Liquid Nuclear Waste Solutions
… is susceptible to the liquid-air interface (LAI) corrosion in liquid nuclear waste and in simulants, but a precise understanding of the mechanism is still missing. This work aimed to expand the understanding of the LAI corrosion mechanism.LAI corrosion was found to initiate at the very top of the …
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Service Life Modeling of Virginia Bridge Decks
… bridge decks is controlled by chloride-induced corrosion of the reinforcing steel. Monte Carlo resampling techniques were used to integrate the statistical nature of the input variables into the model. This is an improvement on previous deterministic models in that the effect of highly variable …
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Service life extension of reinforced concrete structures using hydrophobic impregnation
… concrete structures, mainly due to rebar corrosion, has become a worldwide concern. This has been attributed to insufficient quality and quantity of cover concrete resulting from inadequate mix design and poor onsite workmanship respectively. Engineers also often lack understanding of …
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In situ Nanoscale Quantification of Corrosion Kinetics by Quantitative Phase Microscopy
Corrosion-related degradation incurs a significant cost to infrastructure and society. In 2016, the direct corrosion cost was estimated at $276 billion, which is 3.1% of the U.S. gross domestic product. Despite the known consequences of corrosion damage, many unknowns still exist, such as the …
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Experimental and ab initio investigations into the fundamentals of corrosion, in the context of supercritical water oxidation systems
… even noble metals and the most advanced alloys. Corrosion in chlorinated, acidic streams at transitional temperatures (100-400° C) in a Hastelloy C-276 tube is examined through post-failure analysis and controlled exposure experiments. Dealloying and intergranular corrosion were observed. …
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Parameters Influencing the Corrosion Protection Service Life of Epoxy Coated Reinforcing Steel in Virginia Bridge Decks
… (ECR) and its ability to effectively provide corrosion protection in reinforced concrete highway bridge decks. An analysis was conducted on 10 bridge decks built in the state of Virginia between the years 1981 and 1995. A total of 141 cores containing either ECR or bare steel were evaluated. A …
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Development of measurement techniques for evaluation of inhibitors for controlling rebar corrosion in concrete
… provides a nearly perfect environment for corrosion protection of steel; However, the use of de-icing salts on the highway system has accelerated the deterioration rate of bridge decks in the snow belt. In 1981, over 100,000 bridges were reported to be structurally deficient, and the …
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Corrosion Protection Service Life of Epoxy Coated Reinforcing Steel in Virginia Bridge Decks
The corrosion protection service life extension provided by epoxy-coated reinforcement (ECR) was determined by comparing ECR and bare bar from 10 bridge decks built between 1981 and 1995. The objective was to determine the corrosion protection service life time extension provided by ECR field …
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Corrosion Assessment for Failed Bridge Deck Closure Pour
Corrosion of reinforcing steel in concrete is a significant problem around the world. In the United States, there are approximately 600,000 bridges. From those bridges 24% are considered structurally deficient or functionally obsolete based on the latest, December 2010, statistic from the Federal …
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An investigation into the relationship between surface concrete resistivity and chloride conductivity test
… concrete resistivity with CCT results. Then, corrosion initiation periods (CIP’s) and diffusion coefficients were estimated using Mackechnie’s (1996) CCT SLP model as well as surface concrete resistivity models by Andrade (2004) and Baroghel-Bouny et al. (2009). Input parameters for the model …
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Corrosion performance of coated steel bars in cracked and uncracked reinforced concrete beams
… the underlying carbon steel that would lead to corrosion in road-salt chloride ion environments. Despite several studies investigating the mechanical performance of TEC as compared to ECR, no study has explored the long-term corrosion resistance performance of this new type of coating. This …
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Investigation on the Overall Performance of Recycled Concrete Affected by Alkali-Silica Reaction
… RCA on the chloride diffusivity (and thus corrosion initiation) of concrete. This work aims to appraise the durability performance of RCA concrete made of 100% coarse RCA, particularly two families of RCA selected (i.e., returned concrete RCA, demolished concrete RCA) to represent waste …
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Study on corrosion protection of organic coatings using electrochemical techniques: developing electrochemical noise method, effective of surface preparation and inhomogeneity of organic coatings
This study looks into two important aspects of corrosion protection of steel by organic coatings, steel surface preparation and ionic conduction through the coating, as well as development of the electrochemical noise method as an effective assessment method. Surprising and somehow controversial …
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Chloride transport and chloride thresholdvalues-Studies on concretes and mortars with Portland cement and limestone blended cement
… environment. Chloride initiated reinforcement corrosion is one of the major causes of deterioration of concrete structures. One conflicting issue is how replacing Portland cement with mineral additions influences chloride initiated reinforcement corrosion. This issue is of immediate interest, …
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Computational Simulation of Chloride-Induced Corrosion Damage in Prestressed Concrete Bridge Girders
… concern for such bridges is the possibility of corrosion damage in the prestressing strands or reinforcing bars, which is commonly caused by the use of deicing salts on the deck or saltwater spray in coastal regions. The present study aims at establishing analytical tools for the accurate …
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Behaviour of massive reinforced concrete sections in seawater
… on concrete degradation due to chloride ingress, corrosion of permanently submerged concrete is regarded as negligible due to the long-assumed apparent worst case of tidal or splash zone exposure. Around 350 specimens were tested with a further 200 exposed for further testing by future research …