Anodic Polarization Characteristics and Electrochemical Properties of Fe3C in Chloride Solutions
Anodic Polarization Characteristics and Electrochemical Properties of Fe3C in Chloride Solutions
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DOI：
10.1149/2.1311912jes
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发表时间：
2019-08-02
影响因子：
3.9
通讯作者：
Hara, Nobuyoshi
中科院分区：
文献类型：
--
作者：
Kadowaki, Mariko;Muto, Izumi;Hara, Nobuyoshi
研究了气体渗碳法制备的渗碳体（Fe 3C）在pH值为6.0、7.0和8.0的含10 mM氯化钠的硼-硼酸盐缓冲液中的阳极极化行为。发现Fe3C的活性溶解电流低于铁素体的活性溶解电流。这表明Fe3C的耐腐蚀性明显高于铁素体的耐腐蚀性。从电位-pH图，碳被预测生成的Fe3C在阳极极化过程中，在较低的电位，和碳的存在，证实了XPS。碳层似乎充当保护膜，并在较低电位下抑制Fe3C的活性溶解。AES深度分布澄清，铁氧化物层不仅存在于铁氧体上，而且在Fe3C上。Fe3C的伏特电位比铁氧体的伏特电位高约40 mV。Fe3C层的更高伏电势似乎与在Fe3C上形成的氧化膜的性质相关，并且存在通过氧化膜实现Fe3C在更高电势下的钝化的可能性。(C)作者（S）2019由ECS发布。
The anodic polarization behavior of cementite (Fe3C), which was prepared by gas carburizing, was investigated in 10 mM NaClcontaining boric-borate buffers with pH values of 6.0, 7.0 and 8.0. The active dissolution current of the Fe3C was found to be lower than that of the ferrite. This suggests that the corrosion resistance of the Fe3C was clearly higher than that of the ferrite. From the potential-pH diagrams, carbon was predicted to be generated on the Fe3C at lower potentials during the anodic polarization, and the existence of carbon was confirmed by XPS. The carbon layer seems to act as a protective film and suppress the active dissolution of the Fe3C at lower potentials. AES depth profiles clarified that iron oxide layers existed not only on the ferrite but also on the Fe3C. The Volta potential of the Fe3C was approximately 40 mV higher than that of the ferrite. The higher Volta potential of the Fe3C layer seemed to be associated with the nature of the oxide film formed on the Fe3C, and there is a possibility that the passivation of the Fe3C at higher potentials is achieved by an oxide film. (C) The Author(s) 2019. Published by ECS.