Effect of NaCl concentration on corrosion of Al alloy during repeated wet–dry cycle tests at 323 K—comparing with corrosion in immersion tests‐

Chiba, Makoto; Saito, S.; Nagai, Kanae; Takahashi, Hiroki; Shibata, Yutaka

doi:10.1002/sia.5897

Cited by 5 publications

(2 citation statements)

References 21 publications

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“…Thus, different corrosion behaviours can be expected from these two scenarios. Literatures indicated that temperatures, relative humidity and chloride ion, affect the corrosion rate of materials, and complex interactions exist among these factors [7][8][9][10]. It was reported that time of wetness and chloride concentration were the critical factor determining the severity of corrosion [4].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Effect Chloride Ions on Carbon Steel in Closed Environments at Different Temperatures

Ahmed

Hou

Lepková

et al. 2023

CMD

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This paper investigated carbon steel corrosion in an enclosed environment, where one set of steel was immersed in 3.5 wt.% NaCl solution and another exposed to humid (condensation) conditions. The study employed electrochemical noise and electrochemical impedance spectroscopy techniques to monitor real time corrosion behaviour. The samples were evaluated with surface characterisation techniques including optical light microscope, scanning electron microscope with energy dispersive X-ray spectroscopy, and Raman spectroscopy. The results showed that carbon steel immersed in the liquid phase at a constant temperature exhibited the highest weight loss. However, the carbon steel exposed to water condensation (gas phase) at 80 °C manifested extensive localised corrosion. EN results agreed with the microscopy findings.

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Section: Introductionmentioning

confidence: 99%

Investigation of the Effect Chloride Ions on Carbon Steel in Closed Environments at Different Temperatures

Ahmed

Hou

Lepková

et al. 2023

CMD

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“…Airplane bodies are made of Al-FRP laminates because they have low specific gravity and a high strength-to-weight ratio [ 2 ]. Al alloy-cladded pipes are used as outdoor heat exchangers of air-conditioners because of their high heat-conductivities, high processabilities, and stable supply chains [ 3 , 4 ].…”

Section: Introductionmentioning

confidence: 99%

Changes in the Structure and Corrosion Protection Ability of Porous Anodic Oxide Films on Pure Al and Al Alloys by Pore Sealing Treatment

et al. 2022

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It is well known that corrosion protection of pure Al is enormously improved by the formation of porous anodic oxide films and by pore sealing treatment. However, the effects of anodizing and pore sealing on corrosion protection for Al alloys are unclear, because the alloying elements included in Al alloys affect the structure of anodic oxide films. In the present study, porous anodic oxide films are formed on pure Al, 1050-, 3003- and 5052-Al alloys, and pore sealing was carried out in boiling water. Changes in the structure and corrosion protection ability of porous anodic oxide films on pure Al and the Al alloys by pore sealing, were examined by scanning electron microscopy (SEM) and electrochemical impedance spectroscopy (EIS). SEM observation showed that anodic oxide films formed on pure Al have a smooth surface after pore sealing, and that cracks are formed in anodic oxide films on 1050-, 3003- and 5052-aluminum alloys, after pore sealing. Corrosion protection after pore sealing increased with anodizing time on pure Al, but only slightly increased with anodizing time on the Al alloys.

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Corrosion Morphology and Rate of Iron and Steel in NaCl Solutions during Repeated Wet-Dry Cycling Condition

et al. 2021

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Steels are widely used for structural material of bridges. Some of bridges have been used for more than half century, and degradation of bridges become severe problems, due to the atmospheric corrosion of metallic materials. Especially, atmospheric corrosion of steel is caused by cycles of wet and dry conditions, and accelerated by evaporation of raindrops containing Clions. In this study, corrosion of pure iron and steels is investigated under wet-dry cycling condition with NaCl solution by scanning electron microscopy (SEM) and 3D-optical microscopy (3D-OM). Initially 20 mm 3 of 0.02 M-NaCl solution was dropped on pure Fe, SM490Y, and SMA490AW specimens, and then, droplets of water were dropped at the same position of the specimens at 9 min intervals for 150 cycles. All specimens were covered with white, black, and reddish corrosion products at the water-dropped position, and the reddish ones became major with increasing water-dropping cycles. SEM images after corrosion product removal showed pitting corrosion on all specimens, and the corrosion was more severe at the edge areas of water-dropped position than at the center areas. 3D-OM obtained after 150 cycles showed that the deepest pit produced at the edge areas were in the order of Fe >> SM490Y = SMA490AW, and that the total volume loss at the edge areas by corrosion were in the order of Fe > SMA490AW > SM490Y. The corrosion mechanism can be explained by higher rates of O 2 supply at the edge areas and denser corrosion products on steel than on Fe.

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Effect of NaCl concentration on corrosion of Al alloy during repeated wet–dry cycle tests at 323 K—comparing with corrosion in immersion tests‐

Cited by 5 publications

References 21 publications

Investigation of the Effect Chloride Ions on Carbon Steel in Closed Environments at Different Temperatures

Investigation of the Effect Chloride Ions on Carbon Steel in Closed Environments at Different Temperatures

Changes in the Structure and Corrosion Protection Ability of Porous Anodic Oxide Films on Pure Al and Al Alloys by Pore Sealing Treatment

Corrosion Morphology and Rate of Iron and Steel in NaCl Solutions during Repeated Wet-Dry Cycling Condition

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