Effects of cryogenic treatment on the corrosion resistance of the nickel-chromium alloys / 实用口腔医学杂志
Journal of Practical Stomatology
;
(6)1996.
Artículo
en Chino
| WPRIM
| ID: wpr-544755
ABSTRACT
Objective:
To investigate the feasibility of improving the corrosion resistance of nickel-chromium alloys by the means of cryogenic treatment.Methods:
16 disk samples were divided into 4 groups, including control group(C), cryotreat group(E1),tempering after cryotreat group(E2) and simulative porcelain sintering after cryotreat group(E3). All samples were subjected to electrochemical potentiodynamic polarization after immersed in the artificial saliva ISO/TR 102711993(E) pH 6.8 for 24 h at ambient temperature. The metallography of all groups were observed by SEM.Results:
①Cryogenic treatment elevated the pitting corrosion potential and dropped the corrosion current of Ni-Cr alloys. Following simulative porcelain sintering,as well as tempering after cryotreat, decreased the corrosion current. But the corrosion potential of Ni-Cr alloys fell after cryotreat and following simulative porcelain sintering. Tempering after cryotreat did not affect the pitting corrosion potential. ②Much small secondary substance separated out and evenly distributed along the crystals of Ni-Cr alloys after cryotreat.Conclusion:
Cryogenic treatment effectively improves the electrochemical corrosion resistance of Ni-Cr alloys, and tempering following cryotreat is unnecessary. It is not recommended to sintering porcelain after cryogenic treatment.
Texto completo:
Disponible
Índice:
WPRIM (Pacífico Occidental)
Idioma:
Chino
Revista:
Journal of Practical Stomatology
Año:
1996
Tipo del documento:
Artículo
Similares
MEDLINE
...
LILACS
LIS