Surface analytics for corrosion research on coated steel sheets SANCORR
Sprache der Bezeichnung:
Englisch
Original Kurzfassung:
Within this project two aspects of degradation and corrosion of coated steel sheets will be tackled with the help of surface analytical methods, like X-ray photoelectron and Auger electron spectroscopy (XPS, AES). The first system to be studied will be advanced galvanic coatings based on ZnMgAl alloys. XPS and AES, besides complementary electron microscopy and optical spectroscopy techniques, will be used to access the topmost surface layer (few nanometers) for a detailed structural and chemical evaluation, depending upon relevant processing and treatment parameters and to monitor and understand processes related to ageing and corrosion attack, especially taking place during the initial stages of degradation. The investigations will be extended towards organic matrices, especially taking notice of the interfacial conditions between the metallic substrate and the overlying organic material. In detail, the corrosion behaviour of bonded ZnMgAl surfaces will be studied, taking advantage of a rather novel microtome cutting technique under a very shallow angle, making the interface and potential chemical gradients within the organic bulk accessible for XPS and reflection electron energy loss spectroscopy (REELS), needed to additionally determine hydrogen-containing and aromatic groups. In the same way thin organic coatings, as used for enhanced insulation and protection properties of electric steel, will be investigated to study the progress of degradation and corrosion in dependence of substrate pre-treatment, coating formulation and processing parameters. Projekt partners: CEST GmbH, voestalpine Stahl GmbH