Elnaz Moslehifard, Sanaz Ghasemzadeh and Farzad Nasirpouri
The purpose of this paper (in vitro) study was to determine the effect of pH of artificial saliva on the corrosion behavior of a Ni-Cr-Mo alloy at 37 ± 1°C.
Abstract
Purpose
The purpose of this paper (in vitro) study was to determine the effect of pH of artificial saliva on the corrosion behavior of a Ni-Cr-Mo alloy at 37 ± 1°C.
Design/methodology/approach
The corrosion behavior of a commercially available Ni-Cr-Mo base dental alloy was studied by potentiodynamic polarization and electrochemical impedance spectroscopy techniques. The effect of pH on corrosion and Ni ion release was also investigated by scanning electron microscopy and atomic absorption spectroscopy.
Findings
The results suggested that the order of corrosion rate was: pH3 > pH5 > pH9 > pH7. Corrosion rate in pH3 was significantly different with other pH levels. Nickel depletion significantly occurred in alloy without passivation. The corrosion resistance and ion release of Ni-Cr-Mo alloys in different pH levels of artificial saliva depended on the stability of the passive layer. Acidic pH level severely corrodes Ni-Cr-Mo base metal alloys and increases Ni ion release.
Originality/value
This manuscript describes the relationship between corrosion rate and nickel ion release of a dental Ni-Cr-Mo base alloy as a function of saliva pH examined by electrochemical impedance spectroscopy (EIS), polarization, scanning electron microscopy and energy dispersive X-ray spectroscopy in artificial saliva. The main novelty of this work includes the material/structure/corrosion relationship in artificial saliva with different pH. This property would be very interesting for dental materials applications and clinical dentistry.
Details
Keywords
Sanaz Hadji, Peyman Gholizadeh and Neda Naghavi
With drastic changes in the external environment, many organizations today cannot continue their activities and create sustainability in achieving long-term goals without having…
Abstract
Purpose
With drastic changes in the external environment, many organizations today cannot continue their activities and create sustainability in achieving long-term goals without having carefully designed and coordinated systems with each other. The human resource performance management system is considered as one of the most important process pillars of any organization that without any specific strategic mechanism, such as inclusive learning, faces challenges and harmful conflicts. The purpose of this study is to diagnose human resource performance management based on the lack of ambidextrous learning themes in the banking system.
Design/methodology/approach
In this study, theoretical screening based on similar research was used to identify the components (diagnosing of human resource performance management) and research propositions (ambidextrous learning themes). Then, Delphi analysis was used to determine the reliability of research components and propositions by the participation of 13 management specialists and experts. In the quantitative part, the components and propositions identified in the form of matrix questionnaires were evaluated by interpretive analysis by 18 managers of banking system.
Findings
The results showed that the proposition of lack of strategic tendencies in learning is considered as the most effective theme of ambidextrous learning in reinforcing the damage of strategic incompatibility in the performance functions of human resource management (HRM).
Originality/value
This result shows that the lack of strategic orientations due to the ineffectiveness in identifying environmental capacities in the banking system in the field of HRM performance is a new challenge.