The long term growth of the protective rust layer formed on weathering steel by atmospheric corrosion during a quarter of a century

1994 ◽  
Vol 36 (2) ◽  
pp. 283-299 ◽  
Author(s):  
M. Yamashita ◽  
H. Miyuki ◽  
Y. Matsuda ◽  
H. Nagano ◽  
T. Misawa
Keyword(s):  
Atmospheric Corrosion ◽  
Weathering Steel ◽  
Rust Layer

ChemInform Abstract: Long Term Growth of the Protective Rust Layer Formed on Weathering Steel by Atmospheric Corrosion During a Quarter of a Century.

ChemInform ◽  
2010 ◽  
Vol 25 (19) ◽  
pp. no-no
Author(s):  
M. YAMASHITA ◽  
H. MIYUKI ◽  
Y. MATSUDA ◽  
H. NAGANO ◽  
T. MISAWA
Keyword(s):  
Atmospheric Corrosion ◽  
Weathering Steel ◽  
Rust Layer

scholarly journals Protective Rust Layer Formed on Weathering Steel by Atmospheric Corrosion for a Quarter of a Century

1993 ◽  
Vol 79 (1) ◽  
pp. 69-75 ◽  
Author(s):  
Toshihei MISAWA ◽  
Masato YAMASHITA ◽  
Yasushi MATSUDA ◽  
Hideaki MIYUKI ◽  
Hiroo NAGANO
Keyword(s):  
Atmospheric Corrosion ◽  
Weathering Steel ◽  
Rust Layer

A Study on the Weatherability of Weathering Steel after Atmospheric Corrosion

2012 ◽  
Vol 479-481 ◽  
pp. 574-577
Author(s):  
Zhi Fen Wang ◽  
Jian Rong Liu ◽  
Li Xin Wu ◽  
Hai E Huang ◽  
Qian Xue Zhou
Keyword(s):  
Corrosion Resistance ◽  
Carbon Steel ◽  
Corrosion Rate ◽  
Atmospheric Corrosion ◽  
Alloying Elements ◽  
Weathering Steel ◽  
Rust Layer ◽  
Copper Chromium

The weatherability of a weathering steel W450QN was compared with a carbon steel Q345 after 5 years atmospheric corrosion. The results indicated that the corrosion resistance was better for W450QN than Q345 based on the corrosion rate. The characteristics of the rust layers indicated the rust layer on W450QN was denser and thicker than that of Q345. The rust layers were mainly composed of goethite (α-FeOOH) with a few of lepidocrocite (γ-FeOOH). W450QN had better weatherability attributed to the alloying elements of copper, chromium and phosphorus enriched in the rust layer.

Corrosion behaviors of weathering steel 09CuPCrNi welded joints in simulated marine atmospheric environment

2016 ◽  
Vol 63 (4) ◽  
pp. 295-300 ◽  
Author(s):  
Lihua Gong ◽  
Qing Xing ◽  
Huihuang Wang
Keyword(s):  
Corrosion Rate ◽  
Base Metal ◽  
Welded Joints ◽  
Atmospheric Corrosion ◽  
Atmospheric Environment ◽  
Weathering Steel ◽  
Low Alloy Steel ◽  
Rust Layer ◽  
Content Type ◽  
Corrosion Behaviors

Purpose The purpose of this paper is to investigate the effect of welding procedure on the corrosion behaviors of weathering steel 09CuPCrNi in marine atmospheric environment. The corrosion processes of weathering steel 09CuPCrNi and its welded joints in marine atmospheric environment were simulated by a salt spray dry-wet test. Design/methodology/approach The corrosion behaviors of the base metal and the welded joints at corrosion times of 2, 4, 8, 12, 24 weeks were investigated by weight loss test, electrochemical techniques, scanning electron microscope (SEM) and electron probe micro-analyzer (EPMA). The corrosion rates, as well as the morphologies and electrochemical characteristics of corrosion products, the distribution of major alloying elements in rust layer were obtained. The influence of welding on the atmospheric corrosion of 09CuPCrNi was studied. Findings The results indicate that the corrosion rate of the 09CuPCrNi welded joints decreases gradually with the corrosion time, and the major alloying elements are enriched in the inner rust layer, which are similar to that of the base metal. In the early stage during the corrosion process, the welded joints with inhomogeneous structure show the poorer corrosion resistance than that of the base metal. However, it looks the opposite way around in the late corrosion stage, when the uniform corrosion products with even thickness of the base metal tend to detach from the substrate easier and earlier and resulting in cracks, which increase the corrosion rate comparatively with that of the welded joints. Originality/value 09CuPCrNi low alloy steel is a kind of typical weathering steel developed in China which is similar to Corten A developed by USA. Nowadays, 09CuPCrNi low alloy steel is widely adopted in many fields which require welding processes. In the past years, the research of weathering steel welded joints was mainly concentrated on the strength, toughness and weldability. Less work has been done to investigate the difference of corrosion evolution and characteristics between the base metal and its welded joints. Thus, the main objective of the present work was to analyze the influence of welding on the atmospheric corrosion.

Investigation of the Corrosion Resistance of Weathering Steel at Different Atmospheric Environment

2012 ◽  
Vol 629 ◽  
pp. 240-244
Author(s):  
Zhi Fen Wang ◽  
Jian Rong Liu ◽  
Li Xin Wu ◽  
Yi Qiang Sun ◽  
Rong Dong Han
Keyword(s):  
Corrosion Resistance ◽  
Carbon Steel ◽  
Atmospheric Corrosion ◽  
Atmospheric Environment ◽  
Weathering Steel ◽  
Rust Layer ◽  
Corrosion Rates ◽  
Two Cities ◽  
Environment Factor

The corrosion resistances of a weathering steel SPA-H and a carbon steel Q345 after atmospheric corrosion rests of two cities were measured. The results showed that the corrosion resistance was better for SPA-H than Q345 based on the corrosion rate. The corrosion rates of two steels at Qionghai city were lower than those of Jiangjin city. The characterization of the rusts showed the rust layer on SPA-H was denser and thinner than that of Q345. The rust layers were mainly composed of goethite (α-FeOOH) with a few of lepidocrocite (γ-FeOOH). SPA-H had better weatherability attributed to the alloying elements of copper, chromium and phosphorus enriched in the rust layer. The environment factor such as the sedimentation of SO2 has more effect on the corrosion rates than other factors such as alloy elements.

scholarly journals M^|^ouml;ssbauer Spectroscopic Study on X-ray Amorphous Substance in Rust Layer of Weathering Steel Subjected to Long-Term Exposure in North America

2000 ◽  
Vol 49 (2) ◽  
pp. 82-87 ◽  
Author(s):  
Masato Yamashita ◽  
Toshihei Misawa ◽  
S. J. Oh ◽  
R. Balasubramanian ◽  
D. C. Cook
Keyword(s):  
North America ◽  
Spectroscopic Study ◽  
Weathering Steel ◽  
Rust Layer ◽  
Amorphous Substance ◽  
X Ray

scholarly journals Effect of Oxide Scale Microstructure on Atmospheric Corrosion Behavior of Hot Rolled Steel Strip

Coatings ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 517
Author(s):  
Bin Sun ◽  
Lei Cheng ◽  
Chong-Yang Du ◽  
Jing-Ke Zhang ◽  
Yong-Quan He ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Oxide Scale ◽  
Corrosion Product ◽  
Corrosion Behavior ◽  
Corrosion Test ◽  
Atmospheric Corrosion ◽  
Corrosion Mechanism ◽  
Type I ◽  
Rust Layer ◽  
Hot Rolled

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.

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