Untersuchungen zur SpRK von Aluminiumlegierungen mit modifizierten Randschichten Schlussbericht

The aim of the 'F u. E' project was to improve the stress corrosion cracking of aluminium alloys by means of modification of the surface or marginal layers. The main results of the examinations are: cathodic corrosion protection (Mg) reduces the susceptibility against stress corrosion cracking and prevents initiation of cracks as long as the 'sacrificial anode' is not consumed; noble marginal layers (Si) result in a considerable delay of the incubation period for initiation of cracks. The corrosion protection ability of cathodic coatings is better than that of anodic layers; the protection ability of cathodic layers increases with the thickness of the layer; amorphous or partly amorphous marginal layers, studied with the Zr/Al/Si system, inhibit the initiation of stress corrosion cracking for a prolonged period; under the given conditions it seems that pitting is not a prerequisite for stress corrosion cracking of the investigated aluminium alloy. (orig.)Available from TIB Hannover: F95B954+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEBundesministerium fuer Forschung und Technologie (BMFT), Bonn (Germany)DEGerman