Published February 1989
| Version v1
Journal article
The importance of metastable pitting corrosion in the case of high alloy steels
Creators
- 1. Eidgenoessische Technische Hochschule, Zurich (Switzerland). Inst. fuer Baustoffe, Werkstoffchemie und Korrosion
- 2. Messerschmitt-Boelkow-Blohm GmbH, Ottobrunn (Germany, F.R.). Abt. ZTT 62
Description
A suitable computer-aided experimental method allows during potentiostatic tests to recognize and quantitatively treat current transients. The current transients result from metastable pitting phenomena below the pit propagation potential. It is possible under certain conditions to detect metastable pitting which in the SEM appears in the form of small (approximately 1 μm), in most cases hemispherical pits. A detailed study of metastable pitting has brought about fundamental knowledge about the mechanism of pit initiation, stable pit growth and repassivation in pitting and crevice corrosion processes. (orig.)
Abstract (German)
Mit einer geeigneten computerunterstuetzten experimentellen Methode lassen sich bei potentiostatischen Versuchsfuehrungen Stromtransienten erkennen und quantitativ erfassen. Diese Stromtransienten resultieren aus metastabilen Lochkorrosionsvorgaengen. Unterhalb des Lochwachstumspotentials kann unter bestimmten Bedingungen metastabiler Lochfrass - im Rasterelektronenmikroskop in Form kleiner, etwa 1 μm groesser, meist halbkugelfoermiger Loecher erkennbar - beobachtet werden. Durch ein eingehendes Studium der metastabilen Lochkorrosion werden grundlegende Kenntnisse ueber die Mechanismen der Initiierung, der Stabilitaet, sowie der Repassivierung von Loch- und Spaltkorrosion gewonnen. (orig.)Additional details
Additional titles
- Original title (German)
- Die Bedeutung der metastabilen Lochkorrosion bei hochlegierten Staehlen
Publishing Information
- Journal Title
- Werkstoffe und Korrosion
- Journal Volume
- 40
- Journal Issue
- 2
- Series
- Werkst. Korros.
- Journal Page Range
- 63-70
- ISSN
- 0043-2822
- CODEN
- WSKRA
INIS
- Country of Publication
- Germany
- Country of Input or Organization
- Germany
- INIS RN
- 20044331
- Subject category
- S36: MATERIALS SCIENCE;
- Descriptors DEI
- AQUEOUS SOLUTIONS; CREVICE CORROSION; PITTING CORROSION; SCANNING ELECTRON MICROSCOPY; SODIUM CHLORIDES; STEEL-CR17NI12MO3; STEEL-CR18NI9; TRANSIENTS
- Descriptors DEC
- ALKALI METAL COMPOUNDS; ALLOYS; AUSTENITIC STEELS; CARBON ADDITIONS; CHEMICAL REACTIONS; CHLORIDES; CHLORINE COMPOUNDS; CHROMIUM ALLOYS; CHROMIUM-NICKEL STEELS; CHROMIUM-NICKEL-MOLYBDENUM STE; CORROSION; CORROSION RESISTANT ALLOYS; DISPERSIONS; ELECTRON MICROSCOPY; HALIDES; HALOGEN COMPOUNDS; HEAT RESISTING ALLOYS; HIGH ALLOY STEELS; HOMOGENEOUS MIXTURES; IRON ALLOYS; IRON BASE ALLOYS; MICROSCOPY; MIXTURES; MOLYBDENUM ALLOYS; NICKEL ALLOYS; SODIUM COMPOUNDS; SOLUTIONS; STAINLESS STEELS; STEELS