Naslov
Electrochemical corrosion and hydrogen diffusivity in dual-phase steel

Autori
Malina, Jadranka ; Begić Hadžipašić, Anita ; Nižnik, Štefan

Izvornik
Zaštita materijala (0351-9465) 54 (2013), 2; 130-134

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
DP steel ; electrochemical corrosion ; hydrogen diffusivity ; ferrite ; martensite

Sažetak
Due to application in automotive industry, dual phase (DP) steels have received enormous attention over the last three decades. They show superior mechanical properties when compared to conventional high strength low alloyed (HSLA) steels, but their susceptibility to hydrogen embrittlement need to be explored in a greater extent. Therefore, in this study diffusion properties of hydrogen apsorbed in steel were investigated in order to quantify the paremeters of H-migration through complex microstructure of DP. Electrochemical experiments have shown that exposure of DP steel in 2M H2SO4 under free corrosion potential at room temperature led to the evolution of hydrogen atoms in amount high enough for diffusion through the metal. The values obtained for diffusivity and solubility of atomic hydrogen in DP steel suggest that permeability depends primarily on fine-grained microstructure of ferite and martensite. Such heterogeneous polymorphic structure enables a high solubility of hydrogen within a network of numerous grain boundaries which act as reversible hydrogen traps. At ambient temperatures, these traps cannot retain hydrogen permanently and therefore the net result of trapping is low diffusion rate of hydrogen.

Izvorni jezik
Engleski

Znanstvena područja
Metalurgija

Napomena
Glavni autori: Anita Begić Hadžipašić i Jadranka
Malina

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