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Digitale Medien

The Response of Alloys to Erosion-Corrosion at High Temperatures (1998)

Link, R. J. ; Birks, N. ; Pettit, F. S. ; [weitere]

Springer

Oxidation of metals 49 (1998), S. 213-236

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ISSN: 1573-4889

Schlagwort(e): OXIDATION ; EROSION ; EROSION-CORROSION ; Ni-Cr ALLOYS

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau

Notizen: Abstract Pure nickel, Ni-20Cr and Ni-30Cr alloys wereexposed to conditions of erosion and corrosionsimultaneously at 700°C and 800°C. The exposureswere made using normal impact of an air stream loadedwith 20-μm alumina. The alumina particles flowed at therate of 400 mg per min and the velocities used were 75m/s and 125 m/s. The reaction kinetics were measureddiscontinuously by interrupting the exposure and measuring the weight loss. The specimens wereexamined using SEM-EDAX both on the surface and incross-section. Under simple oxidation, the alloyspecimens developed a thin protective layer of chromia. Under erosion-corrosion conditions, thisprotective scale was prevented from forming and thealloys were found to undergo aggressive attack at a ratethat was the same as that experienced for pure nickel, the surface oxides were identified asCr2O3 and NiO. It is proposedthat, under erosion corrosion, the erosive streamprevents the formation of a continuous layer of chromiaby removing the oxide faster than it can spread laterally. The specimen issaid to be in a state of erosion-maintained transientoxidation. This mechanism implies that it would bedifficult for protective scales to form in the presence of erosion and the oxidation behavior of analloy cannot be used as a guide to its resistance toerosion-corrosion.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1023/A:1018886509459

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Digitale Medien

Enantiomer separation of 2-halocarboxylic acid esters by chiral complexation gas chromatographyDedicated to Professor Ernst Bayer on the occasion of his 60th birthday (1988)

Schurig, V. ; Ossig, A. ; Link, R.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 11 (1988), S. 89-93

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography, GC ; Capillary columns ; glass ; Complexation GC ; Chiral complexation GC ; Enantiomer separation ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: The enantiomer separation of 2-halocarboxylic acid esters on two chiral nickel(II) bis-((perfluoroacyl)terpeneketonates) by complexation gas chromatography is described. The quantitative entiomer separation of branched 2-halocarboxylic acid esters is achieved with nickel (II) bis (3-(heptafluorobutanoyl)(1R, 2S)-pinan-4-onate) 1 while unbranched 2-halocarboxylic acid esters are preferably separated on nickel(II) bis(3-(heptafluorobutanoyl)-(1S)-10-methylenecamphorate) 2. The metal chelates 1 and 2 are accessible in both enantiomeric forms allowing the determination of the enantiomeric excess (ee) effective and reliable.

Zusätzliches Material: 5 Ill.