The formation of passivation in internally oxidized Ag-based alloys

Bezjak, Jožica

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Title:	The formation of passivation in internally oxidized Ag-based alloys
Authors:	ID Bezjak, Jožica (Author)
Files:	http://www.ijser.org/ResearchPaperPublishing_January2012.aspx
Language:	English
Work type:	Not categorized
Typology:	1.01 - Original Scientific Article
Organization:	PEF - Faculty of Education
Abstract:	The aim of this research was to analyse the inhibition of internal passivation by changing the chemical composition of silver alloys and to estimate the concentration boundaries of the selected microalloying element at which the passivation is still inhibited. Since, the ability of inocculationor modification is mostly based on the large free energy of formation of oxides of microalloying elements and their crystallographic similarity, Mg in the quantities of 0.001 to 0.5 mass% was chosen as a microalloying element for Ag-based alloys in addition to the main alloying element (Yn). For the Ag-5.8%Yn alloy, the boundary conditions of the inhibition of passivation were established. For concentrations of MgO below 0.005 vol.% not enough nuclei are formed. For too high concentration of MgO (above 1.2 vol.%) defect microstructures are formed which are characteristic for MgO precipitation. This produces a local or general passivation. By changing the composition of microalloying the internal passivation of Ag-5.8%Yn alloy could not only be inhibited but increased. Thus under some microalloying conditions much bigger depths of internal oxidation were reached.
Keywords:	internal oxidation, chemical composition, silver alloys
Year of publishing:	2012
Number of pages:	6 str.
Numbering:	Vol. 3, no. 1
PID:	20.500.12556/RUP-1178
ISSN:	2229-5518
UDC:	54
COBISS.SI-ID:	4235735
Publication date in RUP:	15.10.2013
Views:	3726
Downloads:	25
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