A survey of Argentinean atmospheric corrosion: I—Aluminium and zinc samples

Vilche, J. R.; Varela, F.E.; Acuña, Geomar; Codaro, Eduardo Norberto; Rosales, B.M.; Fernández, A.; Moriena, Gustavo

doi:10.1016/0010-938x(95)00006-6

Cited by 54 publications

(24 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The simulated precipitate model of Al(OH) 3 , with a denser inner layer and a relatively loose outer layer, is consistent with the generally accepted view. 26,27 It should be stressed that the investigated system in our study concerns micro-galvanic corrosion induced by one cathodic IMP. The driving force is much smaller than in typical pitting experiments under anodic polarization, leading to a much slower dissolution process.…”

Section: Resultsmentioning

confidence: 99%

Numerical Simulation of Micro-Galvanic Corrosion in Al Alloys: Steric Hindrance Effect of Corrosion Product

Wang

Yin

Jin

et al. 2017

J. Electrochem. Soc.

View full text Add to dashboard Cite

An improved finite element model was established to demonstrate the steric hindrance effect of the precipitated corrosion product (Al(OH) 3 ) on micro-galvanic corrosion triggered by intermetallic particles (IMPs) in an Al-matrix. In this model, the precipitation/ dissolution of the corrosion product could occur in the whole liquid field as the result of a reversible reaction. Simulation results show that the precipitated insulating Al(OH) 3 on the electrode surface can inhibit further corrosion by reducing the conductivity of the solution and the active electrode surface area. Meanwhile, the steric hindrance effect of the precipitated Al(OH) 3 also slows down the diffusion and migration of species in the solution. Moreover, considering the porous nature of precipitated Al(OH) 3 , a porosity parameter ε was introduced to describe the degree of compactness of corrosion product, which reaches a certain minimum value ε c under a specific corrosion situation. Compared to the previous work in which a surface coverage parameter was used to describe the blocking effect of Al(OH) 3 on surface activity, the present model is more realistic in mimicking the micro-galvanic corrosion, and also useful for the simulation of the transition from metastable pit formation to pit propagation. Al alloys are widely used in many fields as structural materials because of their high strength/weight ratio. Although many Al alloys show high corrosion resistance due to spontaneous formation of a protective oxide layer on the surface, some of them are vulnerable to local corrosion when exposed to aqueous solutions containing halide ions, e.g., Cl− . 1-3 Particularly, the surface heterogeneity may provide initiation sites for localized corrosion.4,5 A precise and comprehensive understanding of the localized corrosion behavior of Al alloys is of great importance.In our series of studies, 6,7 a FEM model has been established to investigate micro-galvanic corrosion induced by cathodic intermetallic particles (IMPs), i.e., trench formation, by taking into account electrochemical kinetics of the single phases involved, homogeneous reactions occurring in the electrolyte, a moving dissolution interface, as well as the precipitation of Al(OH) 3 on the electrode surface and blocking effect of the precipitated corrosion product. However, in the model reported previously, the precipitation was assumed to occur only on the electrode surface, and the blocking effect of the precipitated corrosion product was simply described by a surface coverage parameter (θ). In that case, the precipitation within the liquid phase and multi-dimensional growth of the precipitated corrosion product were not considered, and the steric hindrance on the mass transport was neglected. Such a simplification limits the applicability of the model for simulating practical systems, since the steric hindrance effect of the precipitated corrosion product has been widely recognized to be critical for the development of pitting-like localized corrosion.For instance, Frankel et al. 8,9 ...

show abstract

Section: Resultsmentioning

confidence: 99%

Numerical Simulation of Micro-Galvanic Corrosion in Al Alloys: Steric Hindrance Effect of Corrosion Product

Wang

Yin

Jin

et al. 2017

J. Electrochem. Soc.

View full text Add to dashboard Cite

show abstract

“…Simonkolleite shows chlorine atoms localized on the corner of the zinc tetrahedron, electric neutrality through the H-Cl bonds remaining relatively weak. It displays hexagonal cells as its main structure [58]. Many of the S 1 P 0 atmospheres did not lead to simonkolleite formation, possibly owing to the relatively low Cl − content to substitute OH − ions in the hydrozincite structure, preferably in acidic or almost neutral media, simonkolleite being more stable at high chloride concentrations.…”

Section: Pure Marine Atmospheres (Smentioning

confidence: 99%

Looking Back on Contributions in the Field of Atmospheric Corrosion Offered by the MICAT Ibero-American Testing Network

Morcillo

Chico

Fuente

et al. 2012

International Journal of Corrosion

View full text Add to dashboard Cite

The Ibero-American Map of Atmospheric Corrosiveness (MICAT) project was set up in 1988 sponsored by the International Ibero-American programme “Science and Technology for Development (CYTED)” and ended in 1994 after six years of activities. Fourteen countries were involved in this project: Argentina, Brazil, Chile, Colombia, Costa Rica, Cuba, Ecuador, Mexico, Panama, Peru, Portugal, Spain, Uruguay, and Venezuela. Research was conducted both at laboratories and in a network of 75 atmospheric exposure test sites throughout the Ibero-American region, thus considering a broad spectrum of climatological and pollution conditions. Although with its own peculiarities, the project basically followed the outline of the ISOCORRAG and ICP/UNECE projects, with the aim of a desirable link between the three projects. This paper summarizes the results obtained in the MICAT project for mild steel, zinc, copper, and aluminum specimens exposed for one year in different rural, urban, and marine atmospheres in the Ibero-American region. Complementary morphological and chemical studies were carried out using scanning electron microscopy (SEM) coupled with energy dispersive spectrometry (EDS), X-ray diffraction (XRD), and fourier transform infrared Spectroscopy (FTIR) techniques, in order to correlate climatic and atmospheric conditions and properties of the corrosion products.

show abstract

“…There are many studies on environmental corrosion over a large variety of geographic zones with widely varying environmental and meteorological conditions [25][26][27][28][29]. However, the number of studies, which focus on environmental corrosion in marine-industrial areas, is fairly limited [30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Corrosion behavior of metals and alloys in marine-industrial environment

Natesan

Selvaraj

Manickam³

et al. 2008

Science and Technology of Advanced Materials

View full text Add to dashboard Cite

This work deals with atmospheric corrosion to assess the degrading effects of air pollutants on ferrous and non-ferrous metals and alloys, which are mostly used as engineering materials. An exposure study was conducted in the Tuticorin port area located on the east coast of South India, in the Gulf of Mannar with Sri Lanka to the southeast. Common engineering materials, namely mild steel, galvanized iron, Zn, Al, Cu and Cu-Zn alloys (Cu-27Zn, Cu-30Zn and Cu-37Zn), were used in the investigation. The site was chosen where the metals are exposed to marine and industrial atmospheres. Seasonal 1 to 12 month corrosion losses of these metals and alloys were determined by a weight loss method. The weight losses showed strong corrosion of mild steel, galvanized iron, Cu and Zn and minor effect on Al and Cu-Zn alloys. Linear regression analysis was conducted to study the mechanism of corrosion. The composition of corrosion products formed on the metal surfaces was identified by x-ray diffraction and Fourier transform infrared spectroscopy.

show abstract

A survey of Argentinean atmospheric corrosion: I—Aluminium and zinc samples

Cited by 54 publications

References 23 publications

Numerical Simulation of Micro-Galvanic Corrosion in Al Alloys: Steric Hindrance Effect of Corrosion Product

Numerical Simulation of Micro-Galvanic Corrosion in Al Alloys: Steric Hindrance Effect of Corrosion Product

Looking Back on Contributions in the Field of Atmospheric Corrosion Offered by the MICAT Ibero-American Testing Network

Corrosion behavior of metals and alloys in marine-industrial environment

Contact Info

Product

Resources

About