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35% 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),可以定量判定流体力学因素对电极反应的作用大小.
Effect coefficients(Ψa and Ψc) of hydrodynamic factor on electrode reaction were defined and then analyzed.It was found that the effect coefficient (Ψc) 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 Ψc 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 (Ψc) and anodic reaction (Ψa) 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(Ψc,Ψa).
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