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Effect of Ag addition on the corrosion properties of Sn-based solder alloys
Bui, Q. V.,Nam, N. D.,Noh, B.-I.,Kar, A.,Kim, J.-G.,Jung, S.-B. WILEY-VCH Verlag 2010 Materials and corrosion Vol.61 No.1
<P>Corrosion properties of three different Sn-Ag lead free solder alloys have been investigated in 0.3 wt% Na<SUB>2</SUB>SO<SUB>4</SUB> solution as corrosive environment. As cast solder alloy was analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Volume fractions of the Ag<SUB>3</SUB>Sn in the solders were determined by image analysis technique. Pitting potential and corrosion potential for the alloys were determined by potentiodynamic tests. Electrochemical impedance spectroscopy (EIS) was carried out to measure the film and charge transfer resistance. Alloys with lower Ag content have been found as better corrosion resistance material.</P>
Moorthy, S. M.,Das, S. K.,Kar, N. B.,Urs, S. Raje Korean Society of Sericultural Science 2007 International Journal of Industrial Entomology Vol.14 No.2
The success of rearing with presently available conventional bivoltine is unpredictable in some seasons of the tropical regions due to highly fluctuating adverse climatic conditions. Thus, in order to popularize bivoltine breeds in tropical parts of India, it is very much essential to have a bivoltine breed(s), which can give stable cocoon crop under variable environments. With this objective a breeding programme was undertaken to improve the survival trait in bivoltine silkworm by introducing multivoltine genes into bivoltine through back crossing. Resultant bivoltine lines showed significantly higher survival in compared to the receptor (Bivoltine) parent and control bivoltine breed. Esterase isozyme analysis revealed similar banding pattern in the developed bivoltine and in the donor multivoltine, which predicts the introgression of multivoltine character into evolved bivoltine.