No abstract

Steel sheet today ranks among the highly developed products of Europe's steel industry. Given the increasing consumption and expanding range of applications of the coated steel sheet materials, it is becoming more and more important to know the surface properties. This applies both to the surface of uncoated steel sheet and to that of the metallic zinc and zinc alloy coatings. Current objectives of the steel makers are, in particular, knowledge of the chemical composition of the surface throughout the route of production, as well as targeted production control to achieve a defined composition. A producer or end user correlates the surface composition with technological, processing and service properties, and is hence interested in compiling and complying with defined supply specifications. Against this background, the modern analysis techniques used for the chemical characterisation of steel sheet surfaces take on a key function for product development and quality control. Currently, a multitude of possible analysis techniques like EPMA, GDOES, SNMS, AES and ESCA are available for the chemical characterisation of surfaces. Within the framework of a European research project (ECSC -European coal and steel community), the suitability of such modern analysis techniques for the needs of the steel sheet producers, customers and users has been studied and adapted to the requirements involved. The following article -divided into four parts-will give a report about some analytical applications and the actual state of the art regarding microarea and surface analysis of steel sheet surfaces.

The microsegregations in iron alloys can be thoroughly described in detail by a microprobe analysis. By determining the element contents on a surface (max. 100.100 points of measurement) the elements segregation behaviour in the structure can be examined. Adequate data evaluation such as three‐class‐diagrams, coupling of contents during the precipitation of cored crystals or line‐scans give further evidence of the amount of segregations in the cast or rolled material. In conjunction with other methods such as thermal analysis, the microprobe analysis is able to give information about the solidification of iron alloys.

Gruppe E Nr. 3299 Uberprilfung der Leistungen eimes energiedispersiven Ilontgenspektrometers an einem Hasierelekironenmikroskop und einer JJikrosonde. Eigenschaften des aufgezeichneten Rontgenspektrometers in Abhangigkeit von der Rontgenwellenlange, der Beschleunigungsspannung und dem Probenstrom. Bestimmung einiqer N achweisgrenzen. Vergleich mit dem Kristallspelctrometer. Performance characteristics of an energy-dispersive X-ray spectrometer on a scanning electron microscope and an electron microprobe. Performance test of an en?rgy-d/:spersive X-ray spectrometer on a scanning electron microscope and on an electron microprobe. Properties of the recorded X-ray spectrum as a function of the X-ray wavelength, the accelerating voltage and the specimen current. Determination of some detectability limits. Comparison with the crystal spectrometer. Aptitude aI'analyse microscopique par faisceau eIectronique d'un spectrometre energie-dispersif arayons X. Essai averifier la performance d'un epeeiromdre energie-dispersif arayons X sur un microscope electronique Ii bola-1jage et sur une microsonde. Proprietes du spectre X enregl:stre en fonction de la longueur des ondes X, du voltage d'acceteration ei du courant de l'echantillon. Determination de quelques liml:tes de detection. Comparaison avec le speciromeire aanalyser les cristaux. Sonderabdrucke sind vorn Verlag Stahleisen m. b. H., 4 DUsseldorf 1, Postfach 8229, unter Angabe der Bcstcllnummer Gruppe E Nr, 3299 zu bcziehen. Archiv Iur das Ryder, Baunujaril: Eiqnunq eines energiedispersiven Rontqenspektrometers fur die Elektronenstrahl-Mikroanalyse Eisenhuttcnwesen 42. J ahrgang Helt 9 -September 1971

Einfluß von Phosphor auf den zeitlichen Verlauf der Korrosionsgeschwindigkeit am Ruhepotential beim Beizen in verdünnter Schwefelsäure. Unstetigkeit der Stromdichte‐Potential‐Kurve bei Stählen mit hohen Phosphorgehalten durch Deckschichtbildung. Untersuchungen zum Aufbau und zur chemischen Zusammensetzung der Deckschicht.