Effect of Oxide Scale Microstructure on Atmospheric Corrosion Behavior of Hot Rolled Steel Strip
The atmospheric corrosion behavior of a hot-rolled strip with four types (I–IV) of oxide scale was investigated using the accelerated wet–dry cycle corrosion test. Corrosion resistance and porosity of oxide scale were studied by potentiometric polarization measurements. Characterization of samples a...
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2021-04-01
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doaj-879bb1d3bc9b4797a1808348618442832021-04-28T23:00:58ZengMDPI AGCoatings2079-64122021-04-011151751710.3390/coatings11050517Effect of Oxide Scale Microstructure on Atmospheric Corrosion Behavior of Hot Rolled Steel StripBin Sun0Lei Cheng1Chong-Yang Du2Jing-Ke Zhang3Yong-Quan He4Guang-Ming Cao5School of Mechanical Engineering, Shenyang University, 21 Wanghua South Street, Shenyang 110044, ChinaSchool of Mechanical Engineering, Shenyang University, 21 Wanghua South Street, Shenyang 110044, ChinaSchool of Mechanical Engineering, Shenyang University, 21 Wanghua South Street, Shenyang 110044, ChinaSchool of Mechanical Engineering, Shenyang University, 21 Wanghua South Street, Shenyang 110044, ChinaSchool of Materials Science and Engineering, Zhengzhou University of Aeronautics, 15 Wenyuanxi Road, Zhengzhou 450046, ChinaState Key laboratory of Rolling and Automation, Northeastern University, 11 Wenhua Road, Shenyang 110819, ChinaThe atmospheric corrosion behavior of a hot-rolled strip with four types (I–IV) of oxide scale was investigated using the accelerated wet–dry cycle corrosion test. Corrosion resistance and porosity of oxide scale were studied by potentiometric polarization measurements. Characterization of samples after 80 cycles of the wet–dry corrosion test showed that scale comprised wüstite and magnetite had strongest corrosion resistance. Oxide scale composed of inner magnetite/iron (>70%) and an outer magnetite layer had the weakest corrosion resistance. The corrosion kinetics (weight gain) of each type of oxide scale followed an initial linear and then parabolic (at middle to late corrosion) relationship. This could be predicted by a simple kinetic model which showed good agreement with the experimental results. Analysis of the potentiometric polarization curves, obtained from oxide coated steel electrodes, revealed that the type I oxide scale had the highest porosity, and the corrosion mechanism resulted from the joint effects of electrochemical behavior and the porosity of the oxide scale. In the initial stage of corrosion, the corrosion product nucleated and an outer rust layer formed. As the thickness of outer rust layer increased, the corrosion product developed on the scale defects. An inner rust layer then formed in the localized pits as crack growth of the scale. This attacked the scale and expanded into the substrate during the later stage of corrosion. At this stage, the protective effect of the oxide scale was lost.https://www.mdpi.com/2079-6412/11/5/517oxide scalehot rolled stripatmospheric corrosionporosityrust layer |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Bin Sun Lei Cheng Chong-Yang Du Jing-Ke Zhang Yong-Quan He Guang-Ming Cao |
spellingShingle |
Bin Sun Lei Cheng Chong-Yang Du Jing-Ke Zhang Yong-Quan He Guang-Ming Cao Effect of Oxide Scale Microstructure on Atmospheric Corrosion Behavior of Hot Rolled Steel Strip Coatings oxide scale hot rolled strip atmospheric corrosion porosity rust layer |
author_facet |
Bin Sun Lei Cheng Chong-Yang Du Jing-Ke Zhang Yong-Quan He Guang-Ming Cao |
author_sort |
Bin Sun |
title |
Effect of Oxide Scale Microstructure on Atmospheric Corrosion Behavior of Hot Rolled Steel Strip |
title_short |
Effect of Oxide Scale Microstructure on Atmospheric Corrosion Behavior of Hot Rolled Steel Strip |
title_full |
Effect of Oxide Scale Microstructure on Atmospheric Corrosion Behavior of Hot Rolled Steel Strip |
title_fullStr |
Effect of Oxide Scale Microstructure on Atmospheric Corrosion Behavior of Hot Rolled Steel Strip |
title_full_unstemmed |
Effect of Oxide Scale Microstructure on Atmospheric Corrosion Behavior of Hot Rolled Steel Strip |
title_sort |
effect of oxide scale microstructure on atmospheric corrosion behavior of hot rolled steel strip |
publisher |
MDPI AG |
series |
Coatings |
issn |
2079-6412 |
publishDate |
2021-04-01 |
description |
The atmospheric corrosion behavior of a hot-rolled strip with four types (I–IV) of oxide scale was investigated using the accelerated wet–dry cycle corrosion test. Corrosion resistance and porosity of oxide scale were studied by potentiometric polarization measurements. Characterization of samples after 80 cycles of the wet–dry corrosion test showed that scale comprised wüstite and magnetite had strongest corrosion resistance. Oxide scale composed of inner magnetite/iron (>70%) and an outer magnetite layer had the weakest corrosion resistance. The corrosion kinetics (weight gain) of each type of oxide scale followed an initial linear and then parabolic (at middle to late corrosion) relationship. This could be predicted by a simple kinetic model which showed good agreement with the experimental results. Analysis of the potentiometric polarization curves, obtained from oxide coated steel electrodes, revealed that the type I oxide scale had the highest porosity, and the corrosion mechanism resulted from the joint effects of electrochemical behavior and the porosity of the oxide scale. In the initial stage of corrosion, the corrosion product nucleated and an outer rust layer formed. As the thickness of outer rust layer increased, the corrosion product developed on the scale defects. An inner rust layer then formed in the localized pits as crack growth of the scale. This attacked the scale and expanded into the substrate during the later stage of corrosion. At this stage, the protective effect of the oxide scale was lost. |
topic |
oxide scale hot rolled strip atmospheric corrosion porosity rust layer |
url |
https://www.mdpi.com/2079-6412/11/5/517 |
work_keys_str_mv |
AT binsun effectofoxidescalemicrostructureonatmosphericcorrosionbehaviorofhotrolledsteelstrip AT leicheng effectofoxidescalemicrostructureonatmosphericcorrosionbehaviorofhotrolledsteelstrip AT chongyangdu effectofoxidescalemicrostructureonatmosphericcorrosionbehaviorofhotrolledsteelstrip AT jingkezhang effectofoxidescalemicrostructureonatmosphericcorrosionbehaviorofhotrolledsteelstrip AT yongquanhe effectofoxidescalemicrostructureonatmosphericcorrosionbehaviorofhotrolledsteelstrip AT guangmingcao effectofoxidescalemicrostructureonatmosphericcorrosionbehaviorofhotrolledsteelstrip |
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1721503045902139392 |