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镍基合金Alloy 690广泛应用于高温换热管道中,对其腐蚀机理的准确分析可以为设备提供有效的防腐手段。针对腐蚀表面金属氧化膜具有半导体的性质,利用量子力学的相关知识获得在不同电位下腐蚀过程所对应的能带结构图,分析了产生电流的机理和特点;并从理论上推导出了腐蚀过程中腐蚀电位与电流的相互关系;从微观上解释了腐蚀的动力学机理。结果显示:Alloy 690的腐蚀过程实际上是一种电子的转移和传递过程,该过程中电流主要由溶液、氧化膜和金属界面的产生-复合、扩散、隧穿和雪崩4种电子的转移过程所控制。由理论得到的腐蚀电位与电流的关系与相关的实验结果有很好的一致性,表明用量子力学从微观上揭示腐蚀的动力学机理是合理的。
Nickel-based alloy Alloy 690 is widely used in high-temperature heat exchange pipelines. Accurate analysis of its corrosion mechanism can provide effective anti-corrosion measures for the equipment. In view of the semiconducting nature of the metal oxide film on the surface of corrosion, the structure diagram of the energy band corresponding to the corrosion process at different potentials is obtained by using the knowledge of quantum mechanics, and the mechanism and characteristics of the current generation are analyzed. The corrosion process Corrosion potential and current in the relationship between; microscopic explanation of the kinetic mechanism of corrosion. The results show that the corrosion process of Alloy 690 is actually an electron transfer and transfer process, in which the current mainly consists of the formation of the interface of the solution, the oxide film and the metal - compound, diffusion, tunneling and avalanche four kinds of electron transfer process Controlled. The relationship between corrosion potential and current obtained from the theory is in good agreement with the related experimental results. It is reasonable to reveal the kinetics of corrosion microscopically using quantum mechanics.