No abstract

No abstract

Abstract:In this work, the conditions for the occurrence of Liquid Metal Embrittlement (LME) in the ferritic-martensitic steel T91 in contact with lead, Pb, were examined. Slow tensile tests with notched specimens revealed that in a temperature range close to the melting point of Pb, the steel is sensitive to LME (350-400 • C) and to Solid Metal Induced Embrittlement (SMIE) (300 • C). The cracking was stimulated by wetting (using a chemical flux) and the notch effect. It was found that the multi axial stresses state and the high level of plastic strain in front of the notch were the key factors triggering crack initiation.

No abstract

The effects of applied current, testing time and microstructure on the electrochemical properties of magnesium-based sacrificial anodes in potable water were evaluated. Galvanostatic tests, potentiodynamic polarisation and scanning electron microscopy (SEM) analyses were used to determine anode efficiency, corrosion rate and microstructures of the Mg-anodes under study. The contribution of processes as mechanical material loss and hydrogen evolution on the current wastage was investigated. The effect of the different microstructures like those obtained by heat treatments to reduce the intermetallic phase was also tested.Die Einflu Èsse des angewendeten Stromes, der Versuchszeit und des Gefu Èges auf die elektrochemischen Eigenschaften von galvanischen Anoden auf Magnesiumbasis wurden in Trinkwasser untersucht. Galvanostatische Versuche, potentiodynamische Polarisation und Rasterelektronenmikroskopieanalysen kamen zum Einsatz, um die Anodenwirksamkeit, die Korrosionsgeschwindigkeit und das Gefu Ège der verwendeten Mg-Anoden zu bestimmen. Der Anteil des mechanischen Materialverlustes und der Wasserstoffentwicklung auf den Stromverlust wurden untersucht. Der Einfluss unterschiedlicher Gefu Ège, wie sie durch Wa Èrmebehandlung zur Reduzierung intermetallischer Phasen erzeugt werden, wurde ebenfalls bewertet.2 Experimental procedure AZ63 ingots were melted in a steel crucible at a temperature of 690 8C AE 10 8C. The chemical composition of the AZ63 magnesium alloy is listed in Table 1. Materials and Corrosion 54, 5±11 (2003) Magnesium sacrificial anodes 5