The Role of Rust Layers on the Corrosion Process of Steels in the Atmosphere

ABSTRACTCommon processes used in glazed ceramic production often result in a glaze with a heterogeneous microstructure. Heterogeneities may be due to residual batch materials, intentionally added colorants and opacifiers and/or the products of devitrification and phase separation. To study the effect of heterogeneities in the corrosion process, dynamic imaging microellipsometry was used in-situ in aqueous solutions to measure spatially and temporally resolved changes in the surface of glasses (model glazes). The measurements showed increased durability near inclusions. Residual stress fields surrounding the heterogeneities influenced the results. Decoupling of chemical and mechanical factors causing this increased durability was not possible.

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The role of different surface damages in corrosion process in alkaline sour media

Corrosion Science ◽

10.1016/s0010-938x(01)00154-8 ◽

2002 ◽

Vol 44 (7) ◽

pp. 1515-1528 ◽

Cited By ~ 22

Author(s):

E Sosa ◽

R Cabrera-Sierra ◽

I Garcı́a ◽

M.T Oropeza ◽

I González

Keyword(s):

Corrosion Process ◽

Surface Damages

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Degradation mechanisms of reinforcing iron rebars in monuments: the role of multiscale porosity in the formation of corrosion products investigated by X-ray tomography

Journal of Analytical Atomic Spectrometry ◽

10.1039/c4ja00388h ◽

2015 ◽

Vol 30 (3) ◽

pp. 580-587 ◽

Cited By ~ 9

Author(s):

Mathieu Jacot-Guillarmod ◽

Olivier Rozenbaum ◽

Valérie L'Hostis ◽

Philippe Dillmann ◽

Delphine Neff ◽

...

Keyword(s):

Corrosion Process ◽

Corrosion Products ◽

Degradation Mechanisms ◽

X Ray

Laboratory and synchroton X-ray tomography highlights the role of multiscale porosity in the corrosion process of iron rebars from the Cathedral of Orléans.

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Hydrogen Absorption by Co-Substituted Nd-Fe-B High Coercivity Magnetic Material

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.227.271 ◽

2015 ◽

Vol 227 ◽

pp. 271-274

Author(s):

Henryk Bala ◽

Martyna Dymek ◽

Stefan Szymura ◽

Yuri M. Rabinovich

Keyword(s):

Hydrogen Absorption ◽

Hydrogen Uptake ◽

Corrosion Process ◽

Partial Substitution ◽

High Coercivity ◽

Hydrogen Capacity ◽

Hydrogen Discharge ◽

Discharge Method ◽

Sintered Materials

The present paper aims at explanation of the advantageous role of partial substitution of iron by cobalt in Nd-Fe-B magnet for distinct inhibition of mechanically assisted corrosion phenomena. The hydrogen uptake by Nd16Fe76B8 and Nd16Fe56Co20B8 sintered materials have been compared with the use of charge/discharge method in terms of the alloys corrosion behavior in strong alkaline solution. For initial cycles, the hydrogen discharge capacity of Co-containing alloy is 5-10 times lower than that for the Nd16Fe76B8 reference alloy. After 6-7 cycles both alloys reveal comparable hydrogen capacity. Also the plots of polarization curves testify to comparable corrosion resistance for both materials. The unusual resistance of Nd16Fe56Co20B8 sinter to pulverization should be ascribed to strong inhibition of hydrogen absorption at initial steps of corrosion process.

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Aerobic and Facultative Microorganisms Isolated from Corroded Metallic Structures in a Hydroeletric Power Unit in the Amazon Region of Brazil

Air Soil and Water Research ◽

10.4137/aswr.s6105 ◽

2010 ◽

Vol 3 ◽

pp. ASWR.S6105

Author(s):

Amabel F. Correia ◽

Jorge F.O. Segovia ◽

Roberto M. Bezerra ◽

Magda C.A. Gonçalves ◽

Sócrates S. Ornelas ◽

...

Keyword(s):

Power Unit ◽

Amazon Region ◽

Corrosion Process ◽

Main Question ◽

Scanning Electron Micrographs ◽

Hydroelectric Power ◽

Metallic Structures ◽

New Findings ◽

Microbiologically Induced Corrosion

Aerobic and facultative bacteria belonging to the Enterobacteriaceae, Pseudomonadaceae, Bacillaceae, Corynebacteriaceae and Streptococcaceae families have been isolated from corroded metallic structures of a hydroelectric power unit in the Amazon region of Brazil. In addition to anamorphic dematiaceous and moniliaceous fungi, members of the archeobacteria kingdom were also detected in the same samples. Scanning electron micrographs of metal bars cultivated with consortia of the isolated microorganisms depicted suggestive images of biofilm formation and corroded metallic structures questioning the possible role of these microorganisms in the corrosion activity. We also found Amazonian medicinal plants exhibiting inhibitory activity against some of the isolated microorganisms. Our new findings need additional studies to confirm the participation of some isolated microorganisms in the process of metallic degradation despite our main question if are there particular microorganisms involved in the corrosion process? or if physicochemical conditions would favor the development of a particular microbiota and consequently the corrosion process would result from its metabolism? Therefore we hypothesize that any microorganism could be potentially involved in the genesis of corrosion process. This is the first report in the literature dealing with microbiologically induced corrosion in the Amazon region which is especially characterized by its high humidity and elevated temperature all year round.

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An Experimental Analysis on Rubber-Metal Contact Stress Corrosion in Seawater

Volume 12: Mechanics of Solids, Structures and Fluids ◽

10.1115/imece2008-67437 ◽

2008 ◽

Author(s):

H. Shen ◽

Q. Wen ◽

K. C. Lifer

Keyword(s):

Contact Stress ◽

Contact Area ◽

Corrosion Process ◽

Metal Contact ◽

Adjacent Area ◽

Nickel Aluminum ◽

Corrosion Behaviors ◽

Marine Applications ◽

Corrosive Environments

Rubber components for liquid sealing are widely used in corrosive environments such as marine applications or food-processing equipment. Corrosion is found more frequently at the rubber-metal contact area or its adjacent area than non-contact area in certain situation. While the role of rubber components in corrosion is not fully understood, the deterioration of rubber in aqueous environments may release chloride or acid to accelerate the corrosion process. Contact stress and local liquid entrapment may also affect the corrosion process. In this work, corrosion of rubber parts in combination with different metals and different contact pressure in seawater is studied experimentally. Metals used include titanium, bronze, nickel, aluminum, stainless steel, and 4130 steel. O-rings with different cross section shapes are used to study the role of different contact area shapes in corrosion process. The contact area of rubber components and the metals are designed to have different contact stress. It is found that the corrosion of metals is accelerated by interaction with rubber and contact stress in seawater. The corrosion initiates from the contact area of metals with rubber O-rings. Different materials show different corrosion behaviors in seawater.

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Study on the Role of Marine Fouling Organisms in the Corrosion Process of Steel Materials

Bioprocess ◽

10.12677/bp.2021.112002 ◽

2021 ◽

Vol 11 (02) ◽

pp. 9-18

Author(s):

世凯吴

Keyword(s):

Corrosion Process ◽

Marine Fouling ◽

Fouling Organisms

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Influence of Lead on Zinc Roofing Resistance to Atmospheric Corrosion

Revista de Chimie ◽

10.37358/rc.08.5.1822 ◽

2008 ◽

Vol 59 (5) ◽

Author(s):

Maria Faur

Keyword(s):

Atmospheric Corrosion ◽

Active Role ◽

Corrosion Process ◽

Metallic Surface ◽

Chemical Heterogeneity ◽

Material Distribution ◽

Metallic Material ◽

Micro Analysis

The paper presents the researches carried out for the determination of the chemical heterogeneity influence of zinc roofing metallic surface on the resistance to atmospheric corrosion. Emphasizing of transformations taking place on the surface and inside the structure of metallic material, distribution, depth and form of corrosive attack, as well as micro-analysis of grain boundary and of adjacent corroded surfaces led to determine the lead influence. It was demonstrated the active role of lead, although it was considered harmless concerning the zinc roofing resistance to atmosphere corrosion, for the initiation and evolution of �pitting� corrosion process.

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