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Ge Wang - One of the best experts on this subject based on the ideXlab platform.
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influence of environmental factors on Corrosion of ship structures in marine atmosphere
Corrosion Science, 2009Co-Authors: Guedes C Soares, Y Garbatov, A Zayed, Ge WangAbstract:Abstract This paper deals with the Modelling of the effects of relative humidity, chlorides, and temperature on the Corrosion behaviour of ship steel structures subjected to marine atmospheres. A new Corrosion wastage Model is proposed based on a reference non-linear time-dependent Corrosion Model that is modified by the effect of different environmental factors contained in the marine atmosphere. The Model assesses the Corrosion degradation under stationary environmental conditions denoted as “short-term”. The long-term Corrosion degradation is predicted by considering the succession of the various environmental conditions that can be present in the marine atmosphere during a ship lifetime and adding the Corrosion damage incurred during each of them. Corrosion records (depending only on time) are used to calibrate the reference Model while the effect of environmental factors in increasing or decreasing the Corrosion rate is based on data published by other authors. A numerical example of a representative application of the new Corrosion Model is presented, to demonstrate how to apply the Model.
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Corrosion wastage Model for ship crude oil tanks
Corrosion Science, 2008Co-Authors: Guedes C Soares, Y Garbatov, A Zayed, Ge WangAbstract:Abstract This study investigates the effects of temperature, carbon dioxide and hydrogen sulphide concentrations on the Corrosion behaviour of ship steels subjected to crude oil tank atmospheres. A new Corrosion wastage Model is proposed based on a standard non-linear time dependent Corrosion Model modified by the effect of the different environmental factors contained in the crude oil tank atmosphere. The new Corrosion Model assesses the Corrosion degradation under stationary environmental conditions denoted as “short-term”. The long-term Corrosion degradation is assessed by considering the succession of the various environmental conditions that can be present in the tank and adding the Corrosion damage incurred during each of them. Corrosion records depending only on time are used to calibrate the standard Model while the effect of environmental factors in increasing or decreasing the Corrosion rate is based on formulations published by other authors. A numerical example of a representative application of the new Corrosion Model is presented, to demonstrate how to apply the Model.
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nonlinear time dependent Corrosion wastage of deck plates of ballast and cargo tanks of tankers
Journal of Offshore Mechanics and Arctic Engineering-transactions of The Asme, 2007Co-Authors: Y Garbatov, Guedes C Soares, Ge WangAbstract:The Corrosion wastage of deck plates of ballast and cargo tanks is analyzed based on a nonlinear Corrosion Model. This Model is able to describe an initial period without Corrosion due to the presence of a Corrosion protection system, a transition period with a nonlinear increase of wastage up to a steady state of long-term Corrosion wastage. This Model is applied to Corrosion wastage data of deck plates collected by the American Bureau of Shipping. The objective of this work is to fit this Corrosion wastage Model to the service measured data, determining the values of the Model parameters that represent the best fit to the data so as to describe how Corrosion wastage varies in time as a result of generalized Corrosion.
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non linear time dependent Corrosion wastage of deck plates of ballast and cargo tanks of tankers
ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering, 2005Co-Authors: Y Garbatov, Guedes C Soares, Ge WangAbstract:The Corrosion wastage of deck plates of ballast and cargo tanks is analyzed based on a non-linear Corrosion Model. This Model is able to describe an initial period without Corrosion due to the presence of a Corrosion protection system, a transition period with a nonlinear increase of wastage up to a steady state of long-term Corrosion wastage. This Model is applied to Corrosion wastage data of deck plates collected by the American Bureau of Shipping. The objective of this work is to fit this Corrosion wastage Model to the service measured data, determining the values of the Model parameters that represent the best fit to the data so as to describe how Corrosion wastage varies in time as a result of generalized Corrosion.Copyright © 2005 by ASME
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non linear Corrosion Model for immersed steel plates accounting for environmental factors
2005Co-Authors: Carlos Guedes Soares, Y Garbatov, A Zayed, Ge WangAbstract:The effects of different marine environmental factors on the Corrosion behavior of steel plates totally immersed in salt water are studied. A new Corrosion wastage Model is proposed, based on a non-linear time-dependent function. This Model accounts for the effects of various environmental factors, including salinity, temperature, dissolved oxygen, pH and flow velocity. A numerical example is illustrated for ships trading in different routes in the Pacific Ocean.
Guedes C Soares - One of the best experts on this subject based on the ideXlab platform.
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effect of environmental factors on steel plate Corrosion under marine immersion conditions
Corrosion Engineering Science and Technology, 2011Co-Authors: Guedes C Soares, Y Garbatov, A ZayedAbstract:This study considers different environmental factors affecting Corrosion under marine immersion conditions and proposes a mathematical Model incorporating their effects on Corrosion degradation through the ship life. The study adopts a nonlinear function of time as the reference Corrosion Model calibrated with operational Corrosion data at long term average conditions to represent the Corrosion behaviour under standard environmental conditions. Based on previously obtained field data, a Corrosion deterioration Model is developed, in which a correction factor is proposed to account for the effect of each environmental factor. These multiplicative factors correct the standard prediction of Corrosion degradation to obtain short term estimates under any specific environmental condition. Then, a long term estimate of Corrosion degradation is determined by summing the short term Corrosion contributions during the various discrete time periods in which the ship life can be decomposed. A numerical example of a representative application of the new empirical based Corrosion Model is presented, to demonstrate how to apply the Model.
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influence of environmental factors on Corrosion of ship structures in marine atmosphere
Corrosion Science, 2009Co-Authors: Guedes C Soares, Y Garbatov, A Zayed, Ge WangAbstract:Abstract This paper deals with the Modelling of the effects of relative humidity, chlorides, and temperature on the Corrosion behaviour of ship steel structures subjected to marine atmospheres. A new Corrosion wastage Model is proposed based on a reference non-linear time-dependent Corrosion Model that is modified by the effect of different environmental factors contained in the marine atmosphere. The Model assesses the Corrosion degradation under stationary environmental conditions denoted as “short-term”. The long-term Corrosion degradation is predicted by considering the succession of the various environmental conditions that can be present in the marine atmosphere during a ship lifetime and adding the Corrosion damage incurred during each of them. Corrosion records (depending only on time) are used to calibrate the reference Model while the effect of environmental factors in increasing or decreasing the Corrosion rate is based on data published by other authors. A numerical example of a representative application of the new Corrosion Model is presented, to demonstrate how to apply the Model.
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Corrosion wastage Model for ship crude oil tanks
Corrosion Science, 2008Co-Authors: Guedes C Soares, Y Garbatov, A Zayed, Ge WangAbstract:Abstract This study investigates the effects of temperature, carbon dioxide and hydrogen sulphide concentrations on the Corrosion behaviour of ship steels subjected to crude oil tank atmospheres. A new Corrosion wastage Model is proposed based on a standard non-linear time dependent Corrosion Model modified by the effect of the different environmental factors contained in the crude oil tank atmosphere. The new Corrosion Model assesses the Corrosion degradation under stationary environmental conditions denoted as “short-term”. The long-term Corrosion degradation is assessed by considering the succession of the various environmental conditions that can be present in the tank and adding the Corrosion damage incurred during each of them. Corrosion records depending only on time are used to calibrate the standard Model while the effect of environmental factors in increasing or decreasing the Corrosion rate is based on formulations published by other authors. A numerical example of a representative application of the new Corrosion Model is presented, to demonstrate how to apply the Model.
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nonlinear time dependent Corrosion wastage of deck plates of ballast and cargo tanks of tankers
Journal of Offshore Mechanics and Arctic Engineering-transactions of The Asme, 2007Co-Authors: Y Garbatov, Guedes C Soares, Ge WangAbstract:The Corrosion wastage of deck plates of ballast and cargo tanks is analyzed based on a nonlinear Corrosion Model. This Model is able to describe an initial period without Corrosion due to the presence of a Corrosion protection system, a transition period with a nonlinear increase of wastage up to a steady state of long-term Corrosion wastage. This Model is applied to Corrosion wastage data of deck plates collected by the American Bureau of Shipping. The objective of this work is to fit this Corrosion wastage Model to the service measured data, determining the values of the Model parameters that represent the best fit to the data so as to describe how Corrosion wastage varies in time as a result of generalized Corrosion.
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non linear time dependent Corrosion wastage of deck plates of ballast and cargo tanks of tankers
ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering, 2005Co-Authors: Y Garbatov, Guedes C Soares, Ge WangAbstract:The Corrosion wastage of deck plates of ballast and cargo tanks is analyzed based on a non-linear Corrosion Model. This Model is able to describe an initial period without Corrosion due to the presence of a Corrosion protection system, a transition period with a nonlinear increase of wastage up to a steady state of long-term Corrosion wastage. This Model is applied to Corrosion wastage data of deck plates collected by the American Bureau of Shipping. The objective of this work is to fit this Corrosion wastage Model to the service measured data, determining the values of the Model parameters that represent the best fit to the data so as to describe how Corrosion wastage varies in time as a result of generalized Corrosion.Copyright © 2005 by ASME
Y Garbatov - One of the best experts on this subject based on the ideXlab platform.
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effect of environmental factors on steel plate Corrosion under marine immersion conditions
Corrosion Engineering Science and Technology, 2011Co-Authors: Guedes C Soares, Y Garbatov, A ZayedAbstract:This study considers different environmental factors affecting Corrosion under marine immersion conditions and proposes a mathematical Model incorporating their effects on Corrosion degradation through the ship life. The study adopts a nonlinear function of time as the reference Corrosion Model calibrated with operational Corrosion data at long term average conditions to represent the Corrosion behaviour under standard environmental conditions. Based on previously obtained field data, a Corrosion deterioration Model is developed, in which a correction factor is proposed to account for the effect of each environmental factor. These multiplicative factors correct the standard prediction of Corrosion degradation to obtain short term estimates under any specific environmental condition. Then, a long term estimate of Corrosion degradation is determined by summing the short term Corrosion contributions during the various discrete time periods in which the ship life can be decomposed. A numerical example of a representative application of the new empirical based Corrosion Model is presented, to demonstrate how to apply the Model.
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influence of environmental factors on Corrosion of ship structures in marine atmosphere
Corrosion Science, 2009Co-Authors: Guedes C Soares, Y Garbatov, A Zayed, Ge WangAbstract:Abstract This paper deals with the Modelling of the effects of relative humidity, chlorides, and temperature on the Corrosion behaviour of ship steel structures subjected to marine atmospheres. A new Corrosion wastage Model is proposed based on a reference non-linear time-dependent Corrosion Model that is modified by the effect of different environmental factors contained in the marine atmosphere. The Model assesses the Corrosion degradation under stationary environmental conditions denoted as “short-term”. The long-term Corrosion degradation is predicted by considering the succession of the various environmental conditions that can be present in the marine atmosphere during a ship lifetime and adding the Corrosion damage incurred during each of them. Corrosion records (depending only on time) are used to calibrate the reference Model while the effect of environmental factors in increasing or decreasing the Corrosion rate is based on data published by other authors. A numerical example of a representative application of the new Corrosion Model is presented, to demonstrate how to apply the Model.
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Corrosion wastage Model for ship crude oil tanks
Corrosion Science, 2008Co-Authors: Guedes C Soares, Y Garbatov, A Zayed, Ge WangAbstract:Abstract This study investigates the effects of temperature, carbon dioxide and hydrogen sulphide concentrations on the Corrosion behaviour of ship steels subjected to crude oil tank atmospheres. A new Corrosion wastage Model is proposed based on a standard non-linear time dependent Corrosion Model modified by the effect of the different environmental factors contained in the crude oil tank atmosphere. The new Corrosion Model assesses the Corrosion degradation under stationary environmental conditions denoted as “short-term”. The long-term Corrosion degradation is assessed by considering the succession of the various environmental conditions that can be present in the tank and adding the Corrosion damage incurred during each of them. Corrosion records depending only on time are used to calibrate the standard Model while the effect of environmental factors in increasing or decreasing the Corrosion rate is based on formulations published by other authors. A numerical example of a representative application of the new Corrosion Model is presented, to demonstrate how to apply the Model.
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nonlinear time dependent Corrosion wastage of deck plates of ballast and cargo tanks of tankers
Journal of Offshore Mechanics and Arctic Engineering-transactions of The Asme, 2007Co-Authors: Y Garbatov, Guedes C Soares, Ge WangAbstract:The Corrosion wastage of deck plates of ballast and cargo tanks is analyzed based on a nonlinear Corrosion Model. This Model is able to describe an initial period without Corrosion due to the presence of a Corrosion protection system, a transition period with a nonlinear increase of wastage up to a steady state of long-term Corrosion wastage. This Model is applied to Corrosion wastage data of deck plates collected by the American Bureau of Shipping. The objective of this work is to fit this Corrosion wastage Model to the service measured data, determining the values of the Model parameters that represent the best fit to the data so as to describe how Corrosion wastage varies in time as a result of generalized Corrosion.
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non linear time dependent Corrosion wastage of deck plates of ballast and cargo tanks of tankers
ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering, 2005Co-Authors: Y Garbatov, Guedes C Soares, Ge WangAbstract:The Corrosion wastage of deck plates of ballast and cargo tanks is analyzed based on a non-linear Corrosion Model. This Model is able to describe an initial period without Corrosion due to the presence of a Corrosion protection system, a transition period with a nonlinear increase of wastage up to a steady state of long-term Corrosion wastage. This Model is applied to Corrosion wastage data of deck plates collected by the American Bureau of Shipping. The objective of this work is to fit this Corrosion wastage Model to the service measured data, determining the values of the Model parameters that represent the best fit to the data so as to describe how Corrosion wastage varies in time as a result of generalized Corrosion.Copyright © 2005 by ASME
Guang-ling Song - One of the best experts on this subject based on the ideXlab platform.
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Corrosion mechanism and evaluation of anodized magnesium alloys
Corrosion Science, 2014Co-Authors: Guang-ling Song, Zhiming ShiAbstract:The Corrosion of anodized Mg alloys is investigated by means of immersion, salt spray, polarization curve, AC electrochemical impedance spectroscopy (EIS), SEM and optical microscopy analyses. Based on the blocking, retarding and passivating effects of an anodized coating on Corrosion of Mg alloys, a Corrosion Model is proposed to illustrate the Corrosion reaction at the coating/substrate interface in coating through-pores. It is found that EIS can sensitively respond to the occurrence of Corrosion in anodized Mg alloys and reflect the protection performance of anodized coatings, which may be used as an in situ method of monitoring Corrosion for anodized Mg alloys.
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anodization and Corrosion of magnesium mg alloys
Corrosion Prevention of Magnesium Alloys, 2013Co-Authors: Guang-ling Song, Zhiming ShiAbstract:Anodization is one of the most important and effective surface pre-treatments for Mg alloys. This chapter systematically summarizes Mg alloy anodizing behavior, the compositions and microstructures of anodized films on Mg alloys and the anodization-influencing factors. Based on the anodizing voltage variation, gas evolution and sparking behavior in a typical anodizing process and the characteristic composition and microstructure of an anodized coating, a four-stage anodizing mechanism is postulated. Moreover, the Corrosion performance of anodized Mg alloys is systematically reviewed and a Corrosion Model is proposed to explain the Corrosion performance and electrochemical behavior. It is believed that some of the measured electrochemical features can be utilized to rapidly evaluate or compare the Corrosion resistance of anodized Mg alloys.
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Crystal orientation and electrochemical Corrosion of polycrystalline Mg
Corrosion Science, 2012Co-Authors: Guang-ling SongAbstract:In this study, scanning Kelvin probe, in situ scanning vibrating electrode technique and micro-electrochemical electrolyte cell are employed to investigate the Corrosion of polycrystalline pure Mg. It is found that differently oriented Mg grains have different electrochemical activities and Corrosion behavior. The grain with a basal orientation is more stable and Corrosion resistant, exhibiting a more positive Corrosion potential, lower anodic polarization current density, larger impedance, and thinner surface film than the grain with a non-basal orientation. A Corrosion Model is proposed to explain the differences in electrochemical Corrosion performance between these grains.
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the surface microstructure and Corrosion of magnesium alloy az31 sheet
Electrochimica Acta, 2010Co-Authors: Guang-ling SongAbstract:Abstract This study investigates the effect of some industrial pre-treatments, including heat-treatment, surface grinding and polishing, acid cleaning and sandblasting, on the Corrosion performance of Mg alloy AZ31 sheet. It is found that tempering accelerates the Corrosion of AZ31. Surface grinding and acid cleaning dramatically improve its Corrosion resistance, while sandblasting severely deteriorates its Corrosion performance. Surface analysis indicates that the change in Corrosion behavior of AZ31 by these pre-treatments can be associated with the alteration of its impurity contamination, surface state, grain size and intermetallic particles. A Corrosion Model concerning the dissolution and precipitation of tiny Al–Mn–(Fe) particles in grains and grain boundaries is proposed to explain the effect of mechanical deformation and heat-treatment on the Corrosion performance of AZ31.
J C Velazquez - One of the best experts on this subject based on the ideXlab platform.
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reliability assessment of buried pipelines based on different Corrosion rate Models
Corrosion Science, 2013Co-Authors: A. Valor, Francisco Caleyo, J.m. Hallen, J C VelazquezAbstract:Abstract Different Corrosion rate (CR) distributions have been derived from various Corrosion growth Models and used to perform reliability analyses of underground pipelines. The CR distributions considered in this work included a single-value distribution, based on the NACE-recommended CR for buried pipelines; a CR distribution derived from the Linear Growth Corrosion Model; Time-dependent and Time-independent CR distributions derived from a soil Corrosion Model; and a CR distribution derived from a Markov chain Corrosion Model. A Monte Carlo reliability framework capable of incorporating these CR distributions has been developed and applied to both synthetic and field-gathered Corrosion data. The use of synthetic data assisted in evaluating the performance of each CR Model with a consideration of Corrosion defects of different sizes and ages. The application of the reliability framework to repeated in-line inspection data revealed the importance of careful selection of the CR distribution for an accurate assessment of the reliability of the inspected pipelines. It was shown that the best CR distribution is one that considers the ages and sizes of the Corrosion defects as well as the observed dependence of the Corrosion defect depth on time. Among the CRs considered in this study, the Markov chain-derived distribution was found to best satisfy these requirements.
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reliability assessment of buried pipelines based on different Corrosion rate Models
Corrosion Science, 2013Co-Authors: A. Valor, Francisco Caleyo, J.m. Hallen, J C VelazquezAbstract:Abstract Different Corrosion rate (CR) distributions have been derived from various Corrosion growth Models and used to perform reliability analyses of underground pipelines. The CR distributions considered in this work included a single-value distribution, based on the NACE-recommended CR for buried pipelines; a CR distribution derived from the Linear Growth Corrosion Model; Time-dependent and Time-independent CR distributions derived from a soil Corrosion Model; and a CR distribution derived from a Markov chain Corrosion Model. A Monte Carlo reliability framework capable of incorporating these CR distributions has been developed and applied to both synthetic and field-gathered Corrosion data. The use of synthetic data assisted in evaluating the performance of each CR Model with a consideration of Corrosion defects of different sizes and ages. The application of the reliability framework to repeated in-line inspection data revealed the importance of careful selection of the CR distribution for an accurate assessment of the reliability of the inspected pipelines. It was shown that the best CR distribution is one that considers the ages and sizes of the Corrosion defects as well as the observed dependence of the Corrosion defect depth on time. Among the CRs considered in this study, the Markov chain-derived distribution was found to best satisfy these requirements.
