from 30 September 2019 to 2 October 2019
Schloss Schönbrunn
Europe/Vienna timezone
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Contribution Oral Presentation

Schloss Schönbrunn - Room A - Maria Theresia

PASSIVITY OF STAINLESS STEELS - CHEMICAL COMPOSITION, ACTIVATION AND REPASSIVATION

Speakers

  • Prof. Gregor MORI

Primary authors

Co-authors

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Content

Passive layers determine corrosion properties of stainless steels. Passive film structure, thickness and defect density is important to understand localised corrosion phenomena such as pitting, crevice and intergranular corrosion. The very limited thickness of passive films - in many cases in a range of a few nanometers - makes them difficult to visualise and to investigate them directly. The paper summarizes the literature and own results on chemical composition and stability on passive layers of various stainless steels. By means of XPS and 3D atom probe passive layers have been investigated and characterised with respect to chemical composition, thickness and structure. Results show that thickness and density of passive layers can vary significantly with alloying content and additional alloying elements such as manganese. In addition the kinetics of formation of passive layers as well as the conditions when activation and repassivation happens as function of pH is shown.

Speaker Country

Austria