Investigation of Rust Layer Formed on Weathering Steel Coated with a Surface Treatment Promoting Protective Rust Formation

Based on the 355MPa high weather-resistant steel, three different kinds of high weather-resistant steels were designed by varying the content of Ni. The the corrosion resistance of the high weather-resistant steel as well as the influence of Ni content on the corrosion resistance were studied in the present investigation. The results of the cycle corrosion tests indicated that with the addition of Ni, the corrosion resistance was improved to some extent. The rust layer of the weathering steel was composed of α-FeOOH and γ-FeOOH at the beginning of corrosion, and the α-FeOOH turned to γ-FeOOH which enhanced the corrosion resistance.

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

Corrosion Science ◽

10.1016/0010-938x(94)90158-9 ◽

1994 ◽

Vol 36 (2) ◽

pp. 283-299 ◽

Cited By ~ 328

Author(s):

M. Yamashita ◽

H. Miyuki ◽

Y. Matsuda ◽

H. Nagano ◽

T. Misawa

Keyword(s):

Atmospheric Corrosion ◽

Weathering Steel ◽

Rust Layer

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

Anti-Corrosion Methods and Materials ◽

10.1108/acmm-09-2019-2178 ◽

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.

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.79-82.957 ◽

2009 ◽

Vol 79-82 ◽

pp. 957-960 ◽

Cited By ~ 1

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.

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