The protective mechanism of the native rust layer on Cr-containing steels exposed to marine atmosphere
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Q. C. Zhang
,
J. S. Wu
Abstract
Cr-containing steel panels have been exposed to marine atmosphere for 2 years. The phase constituents and the microstructure of the rust layer have been characterized using scanning electron microscopy (SEM), electron probe micro-analyzer (EPMA), Raman spectroscopy, and transmission electron microscopy (TEM). Results show that there are many cracks and pores in the rust layer on the surface of mild steel exposed for 2 years, resulting in a higher corrosion rate. But a compact rust layer with a phase constituent of alpha Cr substitute ferrite oxyhydroxide (α-CrxFe1 –xOOH) has been formed on weathering steel panels with a Cr content more than 2 mass% exposed for 2 years. Furthermore, ion selective measurements showed that the rust layer of α-CrxFe1– xOOH can suppress the penetration of corrosive anions, and accordingly weathering steel panels have a lower corrosion rate in the marine atmosphere.
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This research were supported by the Science and Technology Society of Shanghai, China. Appreciation is expressed to P. F. Zhu of the Instrumental Analysis Center of Shanghai JiaoTong University for the use of the Raman spectroscope.
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© 2002 Carl Hanser Verlag, München
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- Notifications/Mitteilungen
- Personen
- DGM conferences
Articles in the same Issue
- Frontmatter
- Articles/Aufsätze
- Mechanical properties of Cu/In – 48 Sn/Cu diffusion-soldered joints
- Effect of ultrasonic (cavitation) treatment of the melt on the microstructure evolution during solidification of aluminum alloy ingots
- Computer simulation of the long-range diffusional transformation based on the postulated principle of maximum dissipation rate of Gibbs energy
- Kinetics of growth of intermetallics in the Cu–Sn system
- Atomic composition of the metastable β″ phase precipitate in an Al –Mg–Si alloy
- Interfacial tension of metastable immiscible alloys: a novel measurement concept
- On the kinetics of the initial oxidation of iron and iron nitride
- Synthesis and characterisation of MgAlON
- Kinetic studies of oxidation of MgAlON and a comparison of the oxidation behaviour of AlON, MgAlON, O’SiAlON–ZrO2, and BN–ZCM ceramics
- Study on warm rolling of AISI 1015 carbon steel
- Experimental study on elastic modulus and damping capacity of woodceramics
- Texture development during cold rolling of unidirectionally solidified Al–Al3Ni alloy
- Wear behavior of A356/M7C3 and A356/SiC particulate metal matrix composites
- Microstructural characterization and microhardness of rapidly solidified Al –Ce alloys
- Effect of quenching rate on the microstructure of rapidly solidified Al –Sr alloys
- The protective mechanism of the native rust layer on Cr-containing steels exposed to marine atmosphere
- Notifications/Mitteilungen
- Personen
- DGM conferences
