摘要
定义了流体力学因素对电极反应的作用系数 (Ψa 和Ψc) ,并进行了计算与分析 .结果表明 :在 3 5 %NaCl流动溶液中 ,随着流速的增大 ,仅碳钢腐蚀的阴极反应作用系数 (Ψc)急剧增大 ,其腐蚀率也随之增大 ,流体力学因素主要加速了碳钢腐蚀的阴极反应过程 .对介质充氮除氧后 ,相同流速条件下 ,只阴极反应作用系数 (Ψc)才显著降低 ;加入缓蚀剂后 ,阴、阳极反应作用系数 (Ψa,c)的变化都不大 .此时 ,流体力学因素对阴、阳极反应均无显著影响 ,碳钢腐蚀率基本不随流速而变化 .可见 ,应用流体力学因素对电极反应的作用系数 (Ψa,c) 。
Effect coefficients( Ψ a and Ψ c) of hydrodynamic factor on electrode reaction were defined and then analyzed.It was found that the effect coefficient ( Ψ c) of hydrodynamic factor on cathodic reaction of corrosion reaction for carbon steel in flowing 3.5% NaCl solution increases with increase of flow velocity,and results in increasing flow-induced corrosion rate of carbon steel.Hydrodynamic factor mainly speeds up the cathodic reaction process of corrosion reaction on carbon steel.After deaeration of the 3.5% NaCl solution with nitrogen,only Ψ c decreased markedly in comparison with that without deaeration at the same flow velocity.However after addition of inhibitor into 3.5% NaCl solution,the effect coefficients of hydrodynamic factor on cathodic reaction ( Ψ c) and anodic reaction ( Ψ a) were little changed.Under this condition,hydrodynamic factor has almost no effect on cathodic reaction and anodic reaction,and results in little changes of flow-induced corrosion rate of carbon steel with increasing flow velocity.Therefore,the effect of hydrodynamic factor on corrosion electrode reaction in flowing corrosive media could quantitatively be analyzed with effect coefficients( Ψ c, Ψ a).
出处
《腐蚀科学与防护技术》
CAS
CSCD
北大核心
2003年第4期204-207,共4页
Corrosion Science and Protection Technology
基金
国家自然科学基金项目 (5 0 10 10 0 2 )
关键词
流体力学因素
定量分析
电极反应
作用系数
腐蚀
碳钢
hydrodynamic factor
corrosion electrode reaction
effect coefficient (Ψ c, Ψ a)
quantitative analysis
