Evaluation of Steel Corrosion Products in Tropical Climates

CORROSION ◽  
1997 ◽  
Vol 53 (11) ◽  
pp. 835-841 ◽  
Author(s):  
A. Rincón ◽  
O. T. de Rincón ◽  
C. Haces ◽  
N. R. Furet ◽  
F. Corvo
Keyword(s):  
Steel Corrosion ◽  
Corrosion Products ◽  
Tropical Climates

scholarly journals Experimental Analysis of Reinforcement Rust in Cement under Corrosive Environment

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 241
Author(s):  
Xiaozhen Li ◽  
Hui Wang ◽  
Jianmin Wang ◽  
Junzhe Liu
Keyword(s):  
Photoelectron Spectroscopy ◽  
Steel Corrosion ◽  
Corrosion Products ◽  
Chloride Salt ◽  
Corrosive Environment ◽  
Cement Slurry ◽  
Passivation Film ◽  
Chloride Environment ◽  
Corrosive Environments ◽  
Structural Layer

In this work, the microstructure characteristics of corrosion products of reinforcement under a corrosive environment with chloride, carbonation and the combination of chloride-carbonization were studied by x-ray photoelectron spectroscopy (XPS) and scanning electron microscopy/energy spectroscopy (SEM-EDX). The results indicate that the outside of the passivation film reacts with the cement slurry to produce Fe–SiO4 in all three corrosive environments. The inner side is not completely corroded. The morphology of the corrosion is different in the three environments. In a chloride environment, corrosion products have obvious cracks, and the local layered structure is dense. In a carbonation environment, the surface of the steel corrosion shows a uniform granular structure and loose texture. With the combination of chloride and combination, the surface of the structural layer of steel corrosion was uneven and accompanied by protrusions, cracking and spalling occurred. The composition of the corrosion substances in the three corrosion environments are mainly composed of FeO, Fe3O4, Fe2O3 and Fe–SiO4. The content of iron oxide increases from a chloride salt, carbonization to the composite environment, indicating that the corrosion degree intensifies successively.

Leaching of Am-241 from a Radioactive Waste Glass Corroded in the Presence of Stainless Steel Corrosion Products and/or Bentonite

1987 ◽  
Vol 112 ◽  
Author(s):  
Masaki Tsukamoto ◽  
Inga-Kari Björner ◽  
Hilbert Christensen ◽  
Hans-Peter Hermansson ◽  
Lars Werme
Keyword(s):  
Stainless Steel ◽  
Radioactive Waste ◽  
Mass Loss ◽  
Total Mass ◽  
Corrosion Behaviour ◽  
Steel Corrosion ◽  
Waste Glass ◽  
Corrosion Products ◽  
Total Mass Loss ◽  
Elemental Mass

AbstractThe release of Am-241 during corrosion of the radioactive waste glass, JSS-A, has been studied in the presence of corrosion products and/or uncom-pacted bentonite. The corrosion behaviour of Am-241 has been analyzed using gamma spectrometry. Adsorption of Am-241 on bentonite is observed in all cases. The contents of Am-241 in centrifuged leachates are in most cases less than 1/100 of total values. The normalized elemental mass loss of Am increases initially with corrosion time, and the values in the presence of bentonite and corrosion products are larger than those in the presence of bentonite alone. This tendency is in agreement with results previously found for other elements. The release of Am is low, only about 10–20 % of the corresponding total mass loss.

scholarly journals XANES-Based Determination of Redox Potentials Imposed by Steel Corrosion Products in Cement-Based Media

2018 ◽  
Author(s):  
Bin Ma ◽  
Alejandro Fernandez-Martinez ◽  
Benoît Madé ◽  
Nathaniel Findling ◽  
Ekaterina Markelova ◽  
...  
Keyword(s):  
Steel Corrosion ◽  
Corrosion Products ◽  
Redox Potentials

A study of the corrosion of polymethyl methacrylate coated rebar using glancing angle X-ray absorption near edge spectroscopy

CORROSION ◽  
10.5006/3912 ◽  
2021 ◽  
Author(s):  
Arthur Situm ◽  
Xiaoxuan Guo ◽  
Burke Barlow ◽  
Bao Guo ◽  
Ian Burgess ◽  
...  
Keyword(s):  
Polymethyl Methacrylate ◽  
Polymer Coating ◽  
Steel Corrosion ◽  
Corrosion Products ◽  
Thin Layers ◽  
Fluorescence Signal ◽  
X Rays ◽  
X Ray ◽  
Glancing Angle ◽  
X Ray Absorption

Polymer coatings can be used to mitigate the corrosion of steel in high chloride environments. Obtaining speciation information from thin corrosion layers can be important for understanding corrosion mechanisms, including polymer coating failure. This study outlines the effectiveness of collecting glancing angle X-ray absorption near edge spectroscopy (GA-XANES) spectra at the Fe K-edge to obtain chemical speciation information at the polymer-steel interface without removal of the polymer film. The depth of penetration of the incident X-rays can be altered by changing the incidence angle, allowing for more fluorescence signal from corrosion products to be detected relative to the Fe metal fluorescence signal in GA-XANES spectra. This study demonstrates the use of GA-XANES to study thin layers of steel corrosion and obtain depth profile information of steel corrosion products beneath a polymethyl methacrylate polymer coating.

Modelling of Pu Sorption onto the Surface of Goethite and Magnetite as Steel Corrosion Products

2003 ◽  
Vol 807 ◽  
Author(s):  
Lara Duro ◽  
Tiziana Missana ◽  
Sonia Ripoll ◽  
Mireia Grivé ◽  
Jordi Bruno
Keyword(s):  
Ionic Strength ◽  
Surface Complexation ◽  
Reduction Process ◽  
Steel Corrosion ◽  
Corrosion Products ◽  
Sorption Data ◽  
Titration Data ◽  
Corrosion Of Steel ◽  
Simple Surface ◽  
Sorption Edge

ABSTRACTWe have studied the surface interaction between tetravalent plutonium and two different steel corrosion products: magnetite, which is the final product of the anoxic corrosion of steel, and goethite, which exemplifies a further oxidation of the steel surface due to the presence of active oxidants in the system. The pH of the experiments has been varied from 2 to 10 and the ionic strength from 0.001 to 0.1 M NaClO4. All the sorption experiments were carried out under N2 atmosphere. No significant effect of ionic strength was observed under the conditions studied.The pHpcz of the solids (7.78 for goethite and 6.95 for magnetite) was determined by modelling potentiometric titration data.The results of the experiments show that the sorption edge of plutonium occurs between pH 3 and 4 when using goethite as a sorbing surface and between pH 4 and 5 when magnetite is used.We have modelled the sorption data by using a simple surface complexation approach with no electrostatic term. The model used involves a reduction process of Pu(IV) to Pu(III) in the presence of magnetite, which can be explained by the interaction of the actinide with the ferrous iron present in the solid. In the case of the experiments conducted with goethite, this reduction process is not possible and, therefore, in the model we have included the sorption of tetravalent Pu.

scholarly journals Analysis of Short-Term Steel Corrosion Products Formed in Tropical Marine Environments of Panama

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
Juan A. Jaén ◽  
Josefina Iglesias ◽  
Cecilio Hernández
Keyword(s):  
Corrosion Behaviour ◽  
Low Carbon Steel ◽  
Steel Corrosion ◽  
Corrosion Products ◽  
Urban Site ◽  
Low Carbon ◽  
Short Term ◽  
The Pacific ◽  
The Pacific Ocean ◽  
Time Of Wetness

A low-carbon steel A-36 and two conventional weathering steels A-588 and COR-420 exposed at four atmospheric test stations located in (i) Tocumen, an urban site near the Pacific Ocean, (ii) Sherman-Open, (iii) Sherman-Coastal, and (iv) Sherman-Breakwater on the Caribbean coast of Panama. Kinetics of the short-term atmospheric corrosion process and the relationship with exposure time and environmental characteristics of each site were investigated. The atmospheric exposure conditions, particularly the time of wetness, deposition of chloride, and the washing effect of contaminants on the metal surface by rain are of upmost importance in determining the corrosion behaviour and composition of rust. The corrosion products were mainly identified using room temperature and low temperature (80 K) Mössbauer spectroscopy, FTIR, and X-ray powder diffraction. In all samples,γ-FeOOH andα-FeOOH were the main constituents. Maghemite (γ-Fe2O3), magnetite (Fe3O4), and Akaganeite (β-FeOOH) were also identified.

scholarly journals FORMATION PROCESS AND ELECTROCHEMICAL PROPERTY OF STEEL CORROSION PRODUCTS IN CONCRETE

2015 ◽  
Vol 71 (3) ◽  
pp. 235-247 ◽  
Author(s):  
Satoshi TAKAYA ◽  
Aya NISHIZAWA ◽  
Shiro NAKAMURA ◽  
Takashi YAMAMOTO ◽  
Toyoaki MIYAGAWA
Keyword(s):  
Electrochemical Property ◽  
Formation Process ◽  
Steel Corrosion ◽  
Corrosion Products

scholarly journals Current condition of the exposed concrete façades reinforcement of the Vilanova Artigas building: modern architectural heritage

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Adriana de Araujo ◽  
Claudia de Andrade Oliveira ◽  
Tatiana Regina da Silva Simão
Keyword(s):  
Steel Corrosion ◽  
Corrosion Products ◽  
Structural Safety ◽  
Published Data ◽  
Architectural Heritage ◽  
Electrochemical Tests ◽  
History Of ◽  
Patch Repairs ◽  
Corrosion State ◽  
Active Corrosion

abstract: The heritage of modern architecture in exposed reinforced concrete has been shown pathological manifestations affecting the structural safety and functionality of the buildings. The manifestations are, primarily, associated with the steel corrosion; however published data obtained from site surveys, on the Brazilian architectural heritage and related to the issue, are still scarce in the literature. Thus, the aim of the study is to assess the current condition of the exposed concrete façades reinforcement of the Vilanova Artigas building, a Brazilian architectural heritage, opened in 1969. Legal restrictions limited the destructive tests and sampling areas. The history of the interventions, environmental aggressiveness and preliminary inspection (in the parent concrete and patch repairs) provided qualified information for analyzing in situ testing results. In the sampling areas physical, chemical and electrochemical tests were carried out. The façades surfaces are naturally porous, irregular, with concrete segregation and corrosion products stains; 24% of the concrete was replaced with proprietary mortar repair. In patch repairs, the average carbonation depth ranged from 3 to 29 mm, in concrete it ranged from 15 to 30 mm. The reinforcement cover ranged from 8 to 33 mm. Corrosion potential maps, with equipotential lines drawn at 50 mV intervals, indicated the corrosion-prone areas, where there is a concentration of lines with a variation equal to or greater than 150 mV. The presence of corrosion products, detected in the visual examination of the reinforcement under the patch repairs, validated the active corrosion state. The rough surface of the concrete, the low cover to depassivated reinforcement and the active corrosion state emphasize the need for monitoring the façades and the urgency of implementing a preventive maintenance plan, along with a conservation project in order to preserve the heritage values of the building.

scholarly journals Microbially Promoted Solubilization of Steel Corrosion Products and Fate of Associated Actinides

2003 ◽  
Author(s):  
Yyri A. Gorby ◽  
Gill G. Geesey ◽  
Jr. Frank Caccavo ◽  
James K. Fredrickson
Keyword(s):  
Steel Corrosion ◽  
Corrosion Products
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