Vol.18 No.5 张琳先等：钢筋在新拌混凝土砂浆中的电化学行为 ·481· ABSTRACT The Potential vs time curves of reinforcing steels embedded in fresh concrete mud containing trace amount of Cl have been measured by galvanostatic method with anodic current density of 504\/cm2.The effect of 7 kinds of additives (water reduced agent,fast strengthening agent,inhibits solidifing agent and high perfor- mance water reduced agent,et al)on electrochemical behavior of the embedded steels in low concentration of Cl-has been investigated.The results show that the correct and effective testing method in the Standard JC 475-92 is proved,and trace amount of CI is detrimental to the passivity of the steel tendon embedded in concrete.The additives tested are beneficial to inhibition the breaking up of passive film by CI-for reinforcing steels embedded in fresh concrete mud. KEY WORDS reinforcing steel,concretes,electrochmical/galvanostatic,[CI-] 率半米米米米来米米米率米米率半米来米来米米米米米米米米米米米米米米米米米米米米*米米米米米米米米本米未米本米*米米本米米卡米米木米木米本米未未系米条米家米米家 (上接476页) High Speed Zn-Ni Alloy Electroplating Meng Huimin Wu Jixun Liu Ounxian Lu Yanping Zhang Pugiang Department of Surface Science and Corrosion Engineering ABSTRACT The electrolyte was compelled to form turbulent flow by using speed electro- plating apparatus.The Zn-Ni alloy electro-deposition law in simple sulphate system under high current density was studied.The results indicated that Zn-Ni alloy electroplat- ing is abnormal co-deposition.The content of nickel in the deposite increases with the increase of the ratio of Ni/Ni+Zn and the current density.It decreases with the increase of the fluid speed of electrolyte.On the above basis,the technology of high speed Zn-Ni alloy electroplating has been determined. KEY WORDS high speed plating.electro-deposition,Zn-Ni alloyv ol . 18 N 仓 5 张琳先等 : 钢筋在新拌混凝 土砂浆 中的 电化 学行 为 . 4 81 . A B S T R A C T T h e P o t e n t i a l v s t im e c u rv e s o f r e i n fo r c i n g s t e e l s e m b e d d e d i n fr e s h e o n e r e t e m u d e o n t a i n i n g tr a e e a m o u n t o f C I 一 h a v e b e e n m e a s u r e d b y g a l v a n o s t a ti e m e th o d w i t h a n o d i e e u r e n t d e n s i ty o f s ( ) z八 / e m Z . T h e e fe c t o f 7 k i n d s o f a d d i t i v e s (w a t e r r e d u e e d a g e n t , af s t s t r e n g th e n i n g a g e n t , i n h ib i t s s o li d iif n g a g e n t a n d h i g h P e r fo r - m a n e e w a t e r r e d u e e d a g e n t , e t a l) o n e l e e t r o e h e m i e a l b e h a v i o r o f t h e e m b e d d e d s t e e l s i n l o w e o n c e n t r a t i o n o f C I 一 h a s b e e n i n v e s t ig a te d . T h e r e s u l t s s h o w t h a t th e e o r e e t a n d e fe e t i v e t e s t i n g m e t h o d i n t h e S ta n d a r d J C 4 7 5 一 9 2 1 5 P r o v e d , a n d tr a e e a m o u n t o f C I - 1 5 d e t r im e n t a l t o th e P a s s i v i yt o f t h e s te e l te n d o n e m b e d d e d i n e o n c r e t e . Th e a d d i t i v e s t e s t e d a r e b e n e if e i a l t o i n h i b i t i o n t h e b r e a k i n g u P o f P a s s 一v e if lm b y C I 一 fo r r e i n fo r e i n g s t e e l s e m b e d d e d i n fr e s h e o n c r e t e m u d . K E Y W O R D S r e i n fo r c i n g s t e e l , e o n c r e t e s , e l e e t r o c h m i e a l /g a l v a n o s ta t i e , 【C I 一 」 ( 上接 4 7 6 页 ) H ig h S P e e d Z n 一 N i A l l o y E l e e t r o P l a t i n g 材 已n g H “ i m i n 肠 ixJ u n L i u Q u n x i a n L u ay 塑i n g hZ a n g P u q i a n g D e P a rt m e n t o f S u r af e e S c l e n e e a n d C o r r o s i o n E n g l n e e r , n g A B S T R A C T T h e e l e c t r o l y t e w a s e o m P e l l e d t o fo mr t u r b u l e n t fl o w b y u s i n g s P e e d e l e e t r o - P l a t i n g a P P a r a t u s . T h e Z n 一 N i a l l o y e l e c t r o 一 d e P o s l t i o n l a w i n s im P l e s u lP h a te s y s t e m u n d e r h i g h e u r e n t d e n s l t y w a s s t u d i e d . T h e r e s u l t s i n d i e a te d th a t Z n 一 N I a l l o y e l e c t r o P l a t - i n g 1 5 a b n o mr a l e o 一 d e P o s i t i o n . T h e e o n t e n t o f n i c k e l 一n t h e d e P o s l t e i n e r e a s e s w i t h t h e i n c r e a s e o f th e r a t i o o f N iN/ i+ Z n a n d t h e c u r e n t d e n s i ty . It d e e r e a s e s w i t h th e i n e r e a s e o f t h e fl u id s P e e d o f e l e c t r o ly t e . O n th e a b o v e b a s i s , t h e te e h n o l o g y o f h ig h s P e e d Z n 一 N 1 a ll o y e l e e t r o P l a t i n g h a s b e e n d e t e r m i n e d . K E Y W O R D S h ig h s P e e d P l a t i n g , e l e e t r o 一 d e P o s i t i o n , Z n 一 N i a ll o y