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Corrosion behavior of Ti–6Al–4V alloy weldment in hydrochloric acid / M. Atapour in Materials and corrosion, Vol. 63 N° 2 (Fevrier 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 2 (Fevrier 2012) . - pp. 134–139 Titre : Corrosion behavior of Ti–6Al–4V alloy weldment in hydrochloric acid Type de document : texte imprimé Auteurs : M. Atapour, Auteur ; M. H. Fathi, Auteur ; M. Shamanian, Auteur Année de publication : 2012 Article en page(s) : pp. 134–139 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Corrosion;  electrochemical  impedance  spectroscopy;  hydrochloric  acid;  Ti–6Al–4V;  weldment Résumé : The corrosion behavior of a thin sheet of Ti–6Al–4V alloy was investigated in hydrochloric acid solution after welding by gas tungsten arc welding. The resulting microstructure of the weld metal (WM) consisted of coarse prior β grains containing fine acicular α platelets. It was found that both base metal (BM) and WM exhibited active–passive behavior after surface activation in open circuit potential experiments. The corrosion resistance of the BM and WM was found to decrease with increasing the temperature and acid concentration. However, the WM exhibited higher corrosion rate than the BM in all examined conditions. These results were also corroborated by electrochemical impedance spectroscopy measurements. Furthermore, it was revealed that the activation energy of the corrosion process for the WM was lower as compared to the BM, which confirmed the inferior corrosion behavior of the WM. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005821/abstract [article] Corrosion behavior of Ti–6Al–4V alloy weldment in hydrochloric acid [texte imprimé] / M. Atapour, Auteur ; M. H. Fathi, Auteur ; M. Shamanian, Auteur . - 2012 . - pp. 134–139. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 2 (Fevrier 2012) . - pp. 134–139 Mots-clés : Corrosion;  electrochemical  impedance  spectroscopy;  hydrochloric  acid;  Ti–6Al–4V;  weldment Résumé : The corrosion behavior of a thin sheet of Ti–6Al–4V alloy was investigated in hydrochloric acid solution after welding by gas tungsten arc welding. The resulting microstructure of the weld metal (WM) consisted of coarse prior β grains containing fine acicular α platelets. It was found that both base metal (BM) and WM exhibited active–passive behavior after surface activation in open circuit potential experiments. The corrosion resistance of the BM and WM was found to decrease with increasing the temperature and acid concentration. However, the WM exhibited higher corrosion rate than the BM in all examined conditions. These results were also corroborated by electrochemical impedance spectroscopy measurements. Furthermore, it was revealed that the activation energy of the corrosion process for the WM was lower as compared to the BM, which confirmed the inferior corrosion behavior of the WM. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005821/abstract