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首页> 外文会议>Eurocorr 2004 >MODELING AND DIAGNOSTICS OF METALS CORROSION UNDERTANGENTIAL AND NORMAL TEMPERATURE GRADIENTSCONDITIONS
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MODELING AND DIAGNOSTICS OF METALS CORROSION UNDERTANGENTIAL AND NORMAL TEMPERATURE GRADIENTSCONDITIONS

机译：金属腐蚀非正交和常温梯度条件的建模与诊断

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The general corrosion of heat-exchanger equipments is including two types of damage:thermogalvanic corrosion and corrosion, initiated by heat fluxes from metal to solution. In thepresent paper the attempt to evaluate role these phenomenons with using experimental andtheoretical their modeling is undertaken. Two types of complex plants were used forexperimental modeling the analyzed corrosion systems with temperature gradients : 1- a plantwith non-isothermal flat plate and 2 – a plant with heat-transferring rotating diskelectrode.The thermal and thermogalvanic effects (on the plant type 1) were estimated withusing of special electric and commutation transistor schemes, permitting to determine thedistribution of temperature, potentials and corrosion currents.The influence of normaltemperature gradient (heat flux) on metals corrosion behavior is studied on the plant type 2,construction of which permitted to control hydrodynamic and thermal conditions as on themetal surface as in the solution The approving of the plants for the analysis of iron and coppergeneral and local corrosion in series solutions demonstrated their high operating stability.The suggested theoretical models were founded on the electrochemical kinetics positions forsolving corrosion problem for the systems in which the temperature equilibrium was absent.The offered theoretical calculation of the profile damage of metal dissolving under tangentialgradient conditions was confirmed for corrosion active and passive metals in the systemswithout diffusion limitations. The results received for active, passive metals and metalsundergoing the local corrosion at normal temperature gradient conditions have shown that thecharacter of temperature and heat flux influence on the corrosion resistance can be used asadditional criterions for identification of the process's mechanism.
机译：热交换器设备的一般腐蚀包括两种类型的损坏：热电腐蚀和腐蚀，腐蚀是由金属到溶液的热通量引起的。本文尝试通过实验和理论上的建模来评估这些现象的作用。使用两种类型的复杂工厂对具有温度梯度的腐蚀系统进行实验建模：1-一台非等温平板的工厂和2-一台带有传热旋转圆盘电极的工厂。热和热电效应（针对一类工厂）使用特殊的电气和换向晶体管方案进行了估算，从而可以确定温度，电势和腐蚀电流的分布。研究了常温梯度（热通量）对金属腐蚀行为对2号装置的腐蚀行为的影响，并对其结构进行了控制溶液中金属表面的流体动力学和热条件串联溶液中用于分析铁和铜的工厂和一般腐蚀以及局部腐蚀的工厂的批准证明了它们的高操作稳定性。在电化学动力学位置上建立了建议的理论模型以解决腐蚀问题对于其中温度证实了在切向梯度条件下，对于腐蚀活性金属和钝化金属在无扩散限制的情况下，为切向梯度条件下金属溶解的轮廓破坏提供的理论计算是可行的。在常温梯度条件下对活性金属，钝态金属和金属进行局部腐蚀所获得的结果表明，温度和热通量对耐蚀性的影响可以用作确定该过程机理的附加标准。

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