Role of Ni Addition in Corrosion Behavior of Model Interface between Rust Layer and Steel Matrix on Weathering Steel

2017 ◽  
Vol 80 (10) ◽  
pp. 499-507
Author(s):  
Yu Sugawara ◽  
Waka Inoue ◽  
Ayaka Yomogida ◽  
Izumi Muto ◽  
Shiro Tsuri ◽  
...  
Keyword(s):  
Corrosion Behavior ◽  
Weathering Steel ◽  
Steel Matrix ◽  
Rust Layer ◽  
Ni Addition

Effect of Sn on the corrosion behavior of weathering steel in a simulated tropical marine atmosphere

2020 ◽  
Vol 67 (2) ◽  
pp. 129-139
Author(s):  
Cheng Jiang ◽  
Ying Yang ◽  
Xuequn Cheng ◽  
Jinbin Zhao ◽  
Xiaogang Li
Keyword(s):  
Real Time ◽  
Corrosion Behavior ◽  
Weathering Steel ◽  
Marine Atmosphere ◽  
Rust Layer ◽  
Monitoring Technology ◽  
Content Type ◽  
X Ray ◽  
Tropical Marine Atmosphere ◽  
Current Monitoring

Purpose This study aims to study the effect of Sn on the corrosion behavior of weathering steel (WS) in a simulated tropical marine atmosphere. Design/methodology/approach Indoor alternate immersion tests, electrochemical measurements and real-time current-monitoring technology based on the galvanic corrosion principle were used and the scanning electron microscope, X-ray diffraction, X-ray photoelectron spectroscopy and electron probe microanalyzer were used to analyze the morphology and component of the rust layer. Findings The results indicated that Sn has a positive influence on the corrosion process. Sn participated in the composition of the rust layer in the form of SnO2 and is enriched in the inner rust layer. SnO2 participated in the coprecipitation process with iron oxides and oxyhydroxides, which promoted further transformation of γ-FeOOH to α-FeOOH. As a result, the rust layer of Sn-containing steel was continuous, compact and effectively blocked the invasion of aggressive Cl−. Therefore, the additive of Sn enhanced the corrosion resistance of WS in a simulated tropical marine atmosphere. Originality/value The corrosion behaviors of WS were researched by the real-time current-monitoring technology which was rarely used.

The Corrosion Mechanism of Cu-Containing Weathering Steel in a Cyclic Dry-Wet Condition

2009 ◽  
Vol 79-82 ◽  
pp. 957-960 ◽  
Author(s):  
Li Jie Yue ◽  
Wei Gong Chen
Keyword(s):  
Corrosion Resistance ◽  
Rare Earth ◽  
Corrosion Product ◽  
Resistance Mechanism ◽  
Electrochemical Corrosion ◽  
Weathering Steel ◽  
Corrosion Mechanism ◽  
Steel Matrix ◽  
Rust Layer ◽  
The Rare Earth

The weather resistance of 10CuPRE、10CuP and Q235 steels were studied by dry-wet cyclic immersion test. The corrosion resistance mechanism of rare earth Cu-containing weathering steel was studied through electrochemical polarization test, scanning electron microscope(SEM) and X ray diffraction(XRD). The results show the small and spherical rare earth oxysulfides replace the elongated MnS inclusions in the rare earth weathering steel. Less and fewer rare earth oxysulfides heavily decrease pitting susceptibility and rate of pit propagation. So the electrochemical corrosion of microarea in the steel matrix is weakened after rare earth was added in the Cu-containing weathering steel. The inner rust layer of rare earth weathering steel is more compact and uniform than that of weathering steel without rare earth. The main corrosion product on the rare earth weathering steel is α-FeOOH. The formation of the steady corrosion product is promoted by rare earth, which result in that the protective property of the inner rust layer on weathering steels is enhanced. As a result, the corrosion resistance of Cu-containing weathering steel is improved by rare earth elements.

Corrosion Behavior of New Weathering Steel in the Environment Simulating Coastal Industrial Atmosphere

2012 ◽  
Vol 479-481 ◽  
pp. 322-326
Author(s):  
Wen Fang Cui ◽  
Chang Jing Shao ◽  
Chun Ming Liu
Keyword(s):  
Corrosion Behavior ◽  
Electrochemical Impedance ◽  
Stable Phase ◽  
Weathering Steel ◽  
Uniform Corrosion ◽  
Bainitic Steel ◽  
Low Carbon ◽  
Rust Layer ◽  
Electrochemical Impedance Spectra ◽  
Industrial Atmosphere

The corrosion behavior of low carbon bainitic steel with Cu-P alloying in the environment simulating coastal industrial atmosphere was investigated by using dry-wet cycling corrosion test. 09CuPCrNi steel and low carbon bainitic steel without Cu-P alloying were used as comparative steels. The corrosion kinetics and electrochemical impedance spectra of the steels were measured, respectively. The morphologies of rust layers were observed by SEM and the phase constitutes of the rust layers were analyzed by XRD. Low carbon bainitic steel with Cu-P alloying behaves the lowest corrosion rate and the highest resistance of rust layer. Bainite microstructure is responsible for the uniform corrosion and the formation of dense rust layer. Cu-P alloying accelerates the transformation of gamma-FeOOH and Fe3O4 to thermodynamic stable phase alpha-FeOOH, which improves the protective effect of the rust layer.

Further Corrosion Behaviors of Low Carbon Bainitic Steel in the Environment Containing Cl- after the Rust Layer Damaged

2010 ◽  
Vol 638-642 ◽  
pp. 3050-3055
Author(s):  
S.W. Yang ◽  
L. Cui ◽  
Y. He ◽  
Xin Lai He
Keyword(s):  
Electrochemical Measurement ◽  
Alloy Element ◽  
Weathering Steel ◽  
Steel Matrix ◽  
Bainitic Steel ◽  
Low Carbon ◽  
Rust Layer ◽  
Metallographic Observation ◽  
Corrosion Behaviors ◽  
Ferrite Steel

Electrochemical measurement, metallographic observation and x-ray diffraction analysis were employed to investigate the further corrosion behaviors of low carbon bainitic steel in the environment containing Cl-, after its original rust layers had been damaged on different ways. It was found the damnification of rust layers on the low carbon bainitic steel (LCBS) and steels utilized as contrasts, i.e. low carbon ferrite steel (LCS) and a commercial weathering steel 09CUPCrNi (09Cu), could be rapidly self-repaired in the further corrosion process. When damnification degree and further corrosion time were same, the resistance of rust layers and the repair degree of damnification of the low carbon bainitic steel were higher than those of contrasts. The repair ratio of inside damnification is always higher than that of crossed damnification, due to faster formation of rust layer at damaged site, in which NaCl aqueous solution is reserved after dropping. Alloy elements such as Cu and Cr obviously enhance protection of rust layer newly formed at damaged sites. These results indicate that the alloy element content in weathering steel is not enough to improve obviously corrosion resistance of steel matrix, while it is sufficient to enhance protection of rust layer.

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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