Korrosion und Korrosionsschutz in der Medizintechnik

Kunze, E.

doi:10.1002/9783527625659.ch5v

Cited by 16 publications

(24 citation statements)

References 89 publications

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“…Both alloys apparently contain, in agreement with previous findings [21,22], a sufficiently large Cr content required for formation of a protective external Cr-rich scale (chromia or spinel) in Ar-O 2 at 900°C. The amount of Fe found in the surface scale is larger, and consequently the oxidation rate slightly higher in the case of Fe-10Cr than for Fe-20Cr.…”

Section: O 4 From Incorporation Of Internal Oxidessupporting

confidence: 88%

The Effect of Water Vapor on Selective Oxidation of Fe–Cr Alloys

et al. 2008

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Binary Fe-Cr alloys containing 10 and 20 mass% Cr were studied with respect to isothermal oxidation behavior at 900 and 1,050°C in Ar-20%O 2 , Ar-7%H 2 O and Ar-4%H 2 -7%H 2 O. Thermogravimetric analyses in combination with analytical studies using SEM/EDX and Raman Spectroscopy revealed, that in atmospheres in which water vapor is the source of oxygen, Cr exhibits a higher tendency to become internally oxidized than in the Ar-O 2 gas. Contrary to previous studies which showed the presence of water vapor to affect transport processes in the scale, the present results thus reveal that the presence of water vapor also affects the transport processes in the alloy. This mechanism is an ''easy'' explanation of the frequently observed effect that Fe-Cr alloys with intermediate Cr contents (e.g. 10-20%, depending on temperature) exhibit protective chromia-rich scale formation in dry gases but breakaway type Fe-rich oxides in wet gases, provided the oxygen partial pressure is sufficiently high for Fe to become oxidized.

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Section: O 4 From Incorporation Of Internal Oxidessupporting

confidence: 88%

The Effect of Water Vapor on Selective Oxidation of Fe–Cr Alloys

et al. 2008

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“…It could be noticed that the corrosion of mild steel depends on the relative humidity inside the package and cannot be inhibited by the copper particles dispersed in the PE film. In humid air conditions, a better protection performance can be achieved with films containing contact or volatile corrosion inhibitors, which can form a nanoscaled protection layer [20][21][22].…”

Section: Resultsmentioning

confidence: 99%

Corrosion protection properties of copper‐ and carbon‐containing polyethylene films in humid air climates

Köhler

Rammelt

Reinhard

2008

Materials & Corrosion

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The corrosion protection properties of commercially available polyethylene (PE) films containing copper and carbon were investigated and compared with pure PE films of comparable thickness. The composition of these films was analyzed by thermoanalysis and atom emission spectroscopy (ICP-AES). Electrochemical impedance spectroscopy (EIS) and packaging tests were used to determine the ability of copper-and carbon-containing PE films to protect mild steel against corrosion in humid air climates. For the here-investigated samples, no electrochemical activity of copper could be found under these conditions. In contrast to the added copper only the inserted carbon decreased the surface resistance. Additional abrasive tests imply that copper is encapsulated inside the films. For all samples, the permeability to vapor and the insertion of water were similar to the copper and carbon free reference film. The tests in the climate cabinet revealed that mild steel samples packed in copper-and carbon-containing films reached the same degree of corrosion than those in the reference films.

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“…THT is based on the hydrogen-induced alteration in the phase composition and, most important, on the changes of the stability and transformation kinetics of phases [1e3]. Interstitially dissolved hydrogen is trapped preferably in areas of local stress concentrations, such as vacancies, dislocations, precipitations, phase and grain boundaries, which cause crystal lattice expansion as well as lattice distortion [4,5]. The formation of hydrogen-induced phases, such as TiH x in a and a þ b titanium alloys, precipitating preferentially at grain and phase boundaries as a consequence of hydrogen supersaturation and eutectoid decomposition, plays an essential role in the successful implementation of THT [6e10].…”

Section: Introductionmentioning

confidence: 99%