Kinetics of dissolution of aluminum in bismuth and zinc in mercury
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ting O m e t a l l i cS c y l i nId e r s O a n d d iN sks C O Ro f r o tR i n l i q u i d m e t a l s h a s b e e n s t u d i e d by m a n y i n v e s t i g a t o r s . T h e s e s t u d i e s i n c l u d e dissolution kinetics of r o t a t i n g c y l i n d e r s o f S n , P b , a n d Z n in H g ; 1 r e a c t i o n b e t w e e n r o t a t i n g c o p p e r r o d s a n d l i q u i d l e a d a n d bism u t h ;2 s o l u t i o n r a t e s o f l e a d r o d s r o t a t e d i n l i q u i d P b - S n a l l o y s ;3 c o r r o s i o n o f r o t a t i n g z i n c c y l i n d e r s i n l i q u i d b i s m u t h ;4 d i s s o l u t i o n o f C u , N i , a n d C u - N i c y l i n d e r s i n l i q u i d l e a d ;5 s o l u t i o n o f r o t a t i n g t a n t a l u m d i s k s i n l i q u i d t i n ;6 a n d d i s s o l u t i o n k i n e t i c s of t y p e 304 s t a i n l e s s s t e e l d i s k s in t h e B i - S n e u t e c t i c a l l o y ] Such investigations of dynamic liquid m e t a l corrosion have s h o w n that t h e s o l u t i o n r a t e o f a s o l i d i n a l i q u i d m e t a l o f t e n is g r e a t l y d e p e n d e n t o n h y d r o d y n a m i c c o n d i t i o n s a n d m a y be g o v e r n e d e i t h e r by d i f f u s i o n i n the l i q u i d o r by s u r f a c e r e a c t i o n s a t the s o l i d / l i q u i d interface. It i s t h e p u r p o s e of t h i s p a p e r t o p r e s e n t e x p e r i m e n tal r e s u l t s r e g a r d i n g dissolution kinetics of a) polyc r y s t a l l i n e a l u m i n u m c y l i n d e r s r o t a t e d i n l i q u i d bism u t h a t t e m p e r a t u r e s o f 300 ° t o 6 0 0 ° C , a n d b) z i n c s i n g l e c r y s t a l d i s k s o f k n o w n o r i e n t a t i o n r o t a t e d in m e r c u r y at 50°C. T h e r e s u l t s a r e analyzed o n t h e b a s i s of Nernst-Brunner relation s for the determination o f s o l u t i o n r a t e c o n s t a n t s . E X P E R I M E N T A L A l u m i n u m c y l i n d e r s , 2 c m in d i a m a n d 6 c m l o n g , were m a c h i n e d from high purity a l u m i n u m (99.99 pct). The cylinders with freshly-machined cylindrical surf a c e s w e r e i m m e r s e d in V y c o r c r u c i b l e s (5.6 c m I D a n d 12 c m l o n g ) c o n t a i n i n g a p p r o x i m a t e l y 1 8 0 0 g of pure liquid b i s m u t h (99.999 pct). The cylinders were c e n t e r e d in the b i s m u t h m e l t o n a l o w c a r b o n s t e e l r o t o r , a n d the s y s t e m w a s m a i n t a i n e d at t e m p e r a t u r e s in the r a n g e of 3 0 0 ° to 6 0 0 ° C in a v e r t i c a l r e s i s t a n c e f u r n a c e a n d t h e r m o s t a t t e d to ± 2 ° C . A p r o t e c t i v e atT. L. SRI KRISHNA, formerly Graduate Student, School of Materials Science and Metallurgical Engineering, Purdue University, Lafayette, Ind., is now Chief Metallurgist, Escorts Ltd, New Delhi, India. M . A. DAYANANDA and R. E. G R A C E are, respectively,Associate Professor and Professor and Head, School of Materials Science and Metallurgical Engineering, Purdue Un
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