Vol.18 左禹等：表面粗糙度对非晶态合金亚稳态小孔形核和生长的影响 ·15· ABSTRACT The effect of surface roughness on nucleation and growth of metastable pitting on amorphous NiCrFeSiB alloy was studied using potentiostatic and potentiody- namic polarization tests.Nucleation of metastable pits on the alloy was significantly facili- tated by rougher surface.Both the growth rate parameters and the peak currents of metastable pits follow log-normal distribution.Rougher surface also promoted the growth of metastable pits,and lead to a wider distribution of the growth rates. KEY WORDS pitting,current fluctuation,surface roughness,amorphous alloy 少时十++十+++分十+十十十+十才十++分十十十十十中++十中→十十中十以十→+十片十十十+十中中” (上接第10页) Influence of Micro-Crystallization by High Energy Density Plasma on High Temperature Oxidation of Fe,Al Wang Yonggang》He Yedong'Zhu Rizhang》Yang Sise2） 1)Department of Surface and Corrosion Engineering.USTB,Beijing 100083,PRC 2)Institute of Physics Academia Sinica ABSTRACT High energy density plasma technique (HEDP)was applied to surface treat- ment of Fe,Al.A micro-crystalline layer with grain sizes between 10 and 100nm was obtained.Isothermal oxidation at 1000 c in air for cast Fe,Al before and after micro-crystallizing was studied.The results showed that for the micro-crystalline Fe,Al, (1)a micro-crystalline oxide scale formed during oxidation;(2)the plasticity and adhe- sion of oxide scale was remarkably improved;(3)the oxidation rate was decreased;(4) the oxidation kinetics obeyed the forth power equation law. KEY WORDS plasma,micro-crystallization,high temperature oxidation,corrosionV o l . 1 8 左禹等: 表 面粗糙度 对非 晶 态合金亚稳态小孔形核和 生 长 的影 响 l 5 A B S T R A C T T h e e fe e t o f s u rfa e e r o u g hn e s s o n n u e l e a t i o n an d g r o w th o f m e tas ta b l e P i币n g o n am o rp h o u s N IC rF e s iB a ll o y w a s s tu d i e d u s in g P o t e n ti o s ta t i e an d P o t e n t i o d y - n am i e P o lari za ti o n t e s ts . N u e l e a t i o n o f m e ta s ta b l e P i t s o n th e a ll o y w a s s ign ifi e an t l y fac ili - ta e d b y r o u g h e r s u ri 泊e e . B o th th e g r o w th ra t e P ar m e t e r s a n d th e P e ak e u r e n ts o f m e tas ta b l e P its fo ll o w 1 0 9 一 n o rm a l d i s tri b u t i o n . R o u g h e r s u rfa e e a l s o P r o m o t e d th e gr o 节八h o f m e ta s ta b l e Pits , an d l e a d t o a w i d e r d i s itr b u t i o n o f ht e g r o w ht r a t e s . K E Y W O R D S P i t in g , e ur e n t fl u e ut a ti o n , s u r af e e r o u g h n e s s , am o pr h o u s a ll o y + 今卡 + + 卡 + + + + + + + + 令 + + + + + + + + + + + + + + + 令 + + + + + + 令 + 令 + + + + + + + + + + + , (上 接 第 10 页 ) I n fl u e n e e o f M i e r o 一 C 刁s t a lli z a t i o n b y H i g h E n e r g y D e n s ity p l a s m a o n H i g h T e m p e r a tu r e o x i d a t i o n o f F e 3A I 肠 n g 为 n 缈 n g l ) 价 冷内 n g l ) 肋 u 尺iz 六a n g l ) 为 n g isz e Z) l ) D e P a rt m e n t o f S u r af c e an d C o or s i o n E n g i n e e irn g , U S T B , B e ij i n g 10 0 0 8 3 , P R C 2 ) I n s t i tu t e o f P h y s i e s , A e ad e m i a S in i e a A B S T R A C T H i g h e n e rg y d e n s ity P l a s m a t e e h n iq u e ( H E D P ) w a s ap P li e d t o s u rfa e e tr e a t - m e n t o f F e , A I . A m i c or 一 c 理 s t a l li n e l a y e r w i t h g ar i n s i z e s b e wt e e n 10 an d 10 o mn w a s o b at i n e d . I s o ht e mr a l o x i d a it o n a t 1 0 0 0 ℃ i n a i r fo r e a s t F e 3 A I b e fo r e an d a ft e l m i c r o 一 c 斗s at ll沈i n g w a s s ut d i e d · T h e r e s u lt s s h o w e d ht a t fo r ht e m i c r o 一 c 卿 s at llin e F e 3A I , ( l ) a m i e or 一 e yr s at lli n e o x i d e s e a l e fo mr e d d ur in g o x id a t i o n ; (2 ) ht e Pl a s t i e i yt an d a dh e - s i o n o f o x i d e s e a l e w a s r e m a r k a b l y im P r o v e d : (3 ) ht e o x i d a ti o n r a t e w as d e e r e a s e d : (4 ) ht e o x i d a t i o n k i n e t i e s o b e y e d ht e fo hrt P o w e r e q u a t i o n l a w . K E Y W O R D S P l a s m a , m i e or 一 e yr s at lli z a t i o n , h i g h t e m P e r a ut r e o x i d a t i o n , e o r o s i o n