Electrical conductivity measurements on the liquid PbO-PbCI 2 -PbS System
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Electrical Conductivity Measurements on the Liquid PbO-PbCl2-PbS System K . N A G A T A , H . S U G A W A R A , AND K . S. G O T O A l l o y s f o r high t e m p e r a t u r e u s e s are u s u a l l y c o v e r e d by a p r o t e c t i v e o x i d e l a y e r w h i c h h a s a h i g h melting p o i n t . However, this l a y e r w o u l d dissolve, i f i t w e r e c o n t a c t e d by a l i q u i d m i x t u r e w i t h l o w melting p o i n t such as, for example, PbO-PbCla-PbS m i x t u r e ) T h e r a t e of t h e d i s s o l u t i o n w o u l d be v e r y l i k e l y c o n t r o l l e d by the d i f f u s i o n o f i o n s i n the l i q u i d p h a s e . B e c a u s e t h e i o n i c d i f f u s i v i t y is r e l a t e d to t h e e l e c t r i c a l c o n d u c t i v i t y due t o i o n s , c o n d u c t i v i t y m e a s u r e m e n t s s h o u l d be v e r y h e l p f u l i n d e v e l o p i n g a b e t t e r u n d e r s t a n d i n g o f t h e m e c h a n i s m o f hot c o r r o s i o n of a l l o y s by f u s e d s a l t s . When the m i c r o m e e h a n i s m of the t r a n s p o r t of i o n s is s i m i l a r f o r e l e c t r i c a l c o n d u c t i o n a n d t r a c e r diff u s i o n , t h e d i f f u s i v i t y c a n be e s t i m a t e d f r o m t h e c o n ductivity with t h e help of t h e Nernst-Einstein relation; D[r_
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