Influence of chromium on the initial corrosion behavior of low alloy steels in the CO2–O2–H2S–SO2 wet–dry corrosion environment of cargo oil tankers
来源期刊：International Journal of Minerals Metallurgy and Materials2015年第8期
论文作者：Qing-he Zhao Wei Liu Jie Zhao Dong Zhang Peng-cheng Liu Min-xu Lu
文章页码：829 - 841
摘 要：The influence of Cr on the initial corrosion behavior of low-alloy steels exposed to a CO2–O2–H2S–SO2 wet–dry corrosion environment was investigated using weight-loss measurements, scanning electron microscopy, N2 adsorption tests, X-ray diffraction analysis, and electrochemical impedance spectroscopy. The results show that the corrosion rate increases with increasing Cr content in samples subjected to corrosion for 21 d. However, the rust grain size decreases, its specific surface area increases, and it becomes more compact and denser with increasing Cr content, which indicates the enhanced protectivity of the rust. The results of charge transfer resistance（Rct） calculations indicate that higher Cr contents can accelerate the corrosion during the first 7 d and promote the formation of the enhanced protective inner rust after 14 d; the formed protective inner rust is responsible for the greater corrosion resistance during long-term exposure.
Qing-he Zhao1，Wei Liu1，Jie Zhao2，Dong Zhang1，Peng-cheng Liu1，Min-xu Lu1
1. Institute for Advanced Materials and Technology, University of Science and Technology Beijing2. Marine Product Management Department, China Classification Society Headquarters
摘 要：The influence of Cr on the initial corrosion behavior of low-alloy steels exposed to a CO2–O2–H2S–SO2 wet–dry corrosion environment was investigated using weight-loss measurements, scanning electron microscopy, N2 adsorption tests, X-ray diffraction analysis, and electrochemical impedance spectroscopy. The results show that the corrosion rate increases with increasing Cr content in samples subjected to corrosion for 21 d. However, the rust grain size decreases, its specific surface area increases, and it becomes more compact and denser with increasing Cr content, which indicates the enhanced protectivity of the rust. The results of charge transfer resistance（Rct） calculations indicate that higher Cr contents can accelerate the corrosion during the first 7 d and promote the formation of the enhanced protective inner rust after 14 d; the formed protective inner rust is responsible for the greater corrosion resistance during long-term exposure.
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