The Experts below are selected from a list of 2472 Experts worldwide ranked by ideXlab platform
Tommaso Pastore - One of the best experts on this subject based on the ideXlab platform.
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steel corrosion monitoring in normal and total lightweight concretes exposed to chloride and sulphate solutions part ii polarisation resistance measurements
Cement and Concrete Research, 1996Co-Authors: Giulia Baronio, M. Berra, Luca Bertolini, Tommaso PastoreAbstract:The paper reports on long time testing of reinforcement corrosion in high strength normal and total-lightweight concretes exposed to cycles consisting of 4 phases: chloride salt fog, drying, sulphate solution immersion, drying. Polarisation resistance monitoring performed for evaluating corrosion rates confirmed passive condition for all reinforcements embedded in normalweight concretes. The initiation of the Corrosive Attack was detected in all the reinforcements in total-lightweight concretes. Corrosion rates up to 400 μm/year were detected.
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Steel corrosion monitoring in normal and total-lightweight concretes exposed to chloride and sulphate solutions part I: Potential measurements
Cement and Concrete Research, 1996Co-Authors: Giulia Baronio, M. Berra, Luca Bertolini, Tommaso PastoreAbstract:The paper reports on long time testing of reinforcement corrosion in normal and total-lightweight concretes exposed to cycles consisting of 4 phases: chloride salt fog, drying, sulphate solution immersion, drying. Potential monitoring evidenced a passive condition for all reinforcements embedded in normalweight concretes. The initiation of the Corrosive Attack in total-lightweight concretes could not be evidenced, although low potential values were found on corroding reinforcements.
H W Pickering - One of the best experts on this subject based on the ideXlab platform.
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pitting on the crevice wall prior to crevice corrosion iron in sulfate chromate solution
Electrochimica Acta, 2011Co-Authors: Faisal M Alfaqeer, H W PickeringAbstract:Abstract Experimental results are presented for the induction period that precedes the onset of crevice corrosion. In situ visual examination and ex situ microscopy revealed that the first Corrosive Attack on the (passive) crevice wall occurs as a pit near the bottom of the crevice. Additional pits and corrosion product form higher and higher on the crevice wall during the induction period. The measured current is initially low in the passive range (10 μA), increasing gradually, but the measured current does not record the large increases in anodic current that produce the pits. The latter result and the observation that gas bubbles form within the pits indicate that the pitting initially is a local cell process of metal dissolution and cathodic reactions on the sample, including H 2 formation which occurs inside the pits in this iron/sulfate-chromate solution (pH 8.8, room temperature). Then, a transition from merging pits to Corrosive Attack across the width of the crevice wall occurs accompanied by a much steeper increasing current. This latter morphology (horizontal boundary that moves up the wall towards the crevice opening, heaviest Attack just below this boundary and passive crevice wall above this boundary) is representative of stable crevice corrosion of the IR type reported in the literature.
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Pitting on the crevice wall prior to crevice corrosion: Iron in sulfate/chromate solution
Electrochimica Acta, 2011Co-Authors: Hung-kai Shu, Faisal M. Al-faqeer, H W PickeringAbstract:Abstract Experimental results are presented for the induction period that precedes the onset of crevice corrosion. In situ visual examination and ex situ microscopy revealed that the first Corrosive Attack on the (passive) crevice wall occurs as a pit near the bottom of the crevice. Additional pits and corrosion product form higher and higher on the crevice wall during the induction period. The measured current is initially low in the passive range (10 μA), increasing gradually, but the measured current does not record the large increases in anodic current that produce the pits. The latter result and the observation that gas bubbles form within the pits indicate that the pitting initially is a local cell process of metal dissolution and cathodic reactions on the sample, including H 2 formation which occurs inside the pits in this iron/sulfate-chromate solution (pH 8.8, room temperature). Then, a transition from merging pits to Corrosive Attack across the width of the crevice wall occurs accompanied by a much steeper increasing current. This latter morphology (horizontal boundary that moves up the wall towards the crevice opening, heaviest Attack just below this boundary and passive crevice wall above this boundary) is representative of stable crevice corrosion of the IR type reported in the literature.
Giulia Baronio - One of the best experts on this subject based on the ideXlab platform.
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steel corrosion monitoring in normal and total lightweight concretes exposed to chloride and sulphate solutions part ii polarisation resistance measurements
Cement and Concrete Research, 1996Co-Authors: Giulia Baronio, M. Berra, Luca Bertolini, Tommaso PastoreAbstract:The paper reports on long time testing of reinforcement corrosion in high strength normal and total-lightweight concretes exposed to cycles consisting of 4 phases: chloride salt fog, drying, sulphate solution immersion, drying. Polarisation resistance monitoring performed for evaluating corrosion rates confirmed passive condition for all reinforcements embedded in normalweight concretes. The initiation of the Corrosive Attack was detected in all the reinforcements in total-lightweight concretes. Corrosion rates up to 400 μm/year were detected.
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Steel corrosion monitoring in normal and total-lightweight concretes exposed to chloride and sulphate solutions part I: Potential measurements
Cement and Concrete Research, 1996Co-Authors: Giulia Baronio, M. Berra, Luca Bertolini, Tommaso PastoreAbstract:The paper reports on long time testing of reinforcement corrosion in normal and total-lightweight concretes exposed to cycles consisting of 4 phases: chloride salt fog, drying, sulphate solution immersion, drying. Potential monitoring evidenced a passive condition for all reinforcements embedded in normalweight concretes. The initiation of the Corrosive Attack in total-lightweight concretes could not be evidenced, although low potential values were found on corroding reinforcements.
Faisal M Alfaqeer - One of the best experts on this subject based on the ideXlab platform.
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pitting on the crevice wall prior to crevice corrosion iron in sulfate chromate solution
Electrochimica Acta, 2011Co-Authors: Faisal M Alfaqeer, H W PickeringAbstract:Abstract Experimental results are presented for the induction period that precedes the onset of crevice corrosion. In situ visual examination and ex situ microscopy revealed that the first Corrosive Attack on the (passive) crevice wall occurs as a pit near the bottom of the crevice. Additional pits and corrosion product form higher and higher on the crevice wall during the induction period. The measured current is initially low in the passive range (10 μA), increasing gradually, but the measured current does not record the large increases in anodic current that produce the pits. The latter result and the observation that gas bubbles form within the pits indicate that the pitting initially is a local cell process of metal dissolution and cathodic reactions on the sample, including H 2 formation which occurs inside the pits in this iron/sulfate-chromate solution (pH 8.8, room temperature). Then, a transition from merging pits to Corrosive Attack across the width of the crevice wall occurs accompanied by a much steeper increasing current. This latter morphology (horizontal boundary that moves up the wall towards the crevice opening, heaviest Attack just below this boundary and passive crevice wall above this boundary) is representative of stable crevice corrosion of the IR type reported in the literature.
Luca Bertolini - One of the best experts on this subject based on the ideXlab platform.
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steel corrosion monitoring in normal and total lightweight concretes exposed to chloride and sulphate solutions part ii polarisation resistance measurements
Cement and Concrete Research, 1996Co-Authors: Giulia Baronio, M. Berra, Luca Bertolini, Tommaso PastoreAbstract:The paper reports on long time testing of reinforcement corrosion in high strength normal and total-lightweight concretes exposed to cycles consisting of 4 phases: chloride salt fog, drying, sulphate solution immersion, drying. Polarisation resistance monitoring performed for evaluating corrosion rates confirmed passive condition for all reinforcements embedded in normalweight concretes. The initiation of the Corrosive Attack was detected in all the reinforcements in total-lightweight concretes. Corrosion rates up to 400 μm/year were detected.
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Steel corrosion monitoring in normal and total-lightweight concretes exposed to chloride and sulphate solutions part I: Potential measurements
Cement and Concrete Research, 1996Co-Authors: Giulia Baronio, M. Berra, Luca Bertolini, Tommaso PastoreAbstract:The paper reports on long time testing of reinforcement corrosion in normal and total-lightweight concretes exposed to cycles consisting of 4 phases: chloride salt fog, drying, sulphate solution immersion, drying. Potential monitoring evidenced a passive condition for all reinforcements embedded in normalweight concretes. The initiation of the Corrosive Attack in total-lightweight concretes could not be evidenced, although low potential values were found on corroding reinforcements.
