Papers by Author: Raluca Fako

Abstract: The paper aims to discuss some aspects on corrosion behavior of specimens from sintered CuNi alloys (e.g. Cu90Ni10; Cu70Ni30). The above mentioned specimens were manufactured by dissimilar laboratory routes: from alloyed powders, from elementary powders and from mixtures consisting of Cu80Ni20 alloy and an alloying element. Research aims to establish the manufacturing parameters influence on sintered specimens characteristics (density, porosity, microstructure features) in order to correlate them with corrosion tests laboratory data. There were investigated the corrosion mechanisms in relation with macro- and microstructure properties of the sintered specimen surface. For comparison purposes, it is intended to extend the analysis to Cu60Ni40 and Cu80Ni20 sintered alloys.

Abstract: The results of a failure investigation performed on a transportation pipeline for oil products (aromatics – water – DEG) are presented. The damage phenomena of the material were attributed to corrosion – erosion, and secondary to stress corrosion cracking. The analysis aims to identify the mechanisms responsible for service failure of an API 5L grade A pipe after about two years and, also, to mitigate further damage phenomena by a proper identification of the contribution of mechanical, metallurgical and environmental factors (focusing both on technological fluids characteristics and inhibition scheme). Expert report conclusion and other field data give premises for re-designing the maintenance, operating and corrosion-monitoring program in order to avoid future hazards.