Structure related corrosion behavior of DLC films in high Cl− environment
Structure related corrosion behavior of DLC films in high Cl− environment
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DOI：
10.1515/corrrev-2021-0004
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发表时间：
2021-08
影响因子：
3.2
通讯作者：
Yukun Zhang;Pengtao Gao;Dongxu Chen;Yanwen Zhou
中科院分区：
文献类型：
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作者：
Yukun Zhang;Pengtao Gao;Dongxu Chen;Yanwen Zhou
摘要采用等离子体增强化学气相沉积法在13 Cr超级马氏体不锈钢表面成功制备了类金刚石膜，其结构随脉冲电源脉冲电压的变化而变化。利用原子力显微镜对DLC膜的微观结构进行了表征，并通过开路电位、极化曲线和电化学阻抗谱分析了DLC膜在高Cl−环境中的腐蚀行为。结果表明，开孔类金刚石膜首先发生基体腐蚀，然后发生基体表面钝化，最后发生腐蚀失效。在局部缺陷处形成腐蚀坑之前，具有封闭孔隙的类金刚石膜可以有效地阻止Cl-对基体的侵蚀。
Abstract The diamond-like carbon (DLC) films were successfully fabricated on the surface of 13Cr super martensitic stainless steel by plasma enhanced chemical vapour deposition, and the microstructure changed with the variation of pulse voltages of the high pulse power supply. The microstructure of the DLC films was characterized by atomic force microscope, and the corrosion behavior of the films in a high Cl− environment was analyzed by open circuit potential, polarization curve and electrochemical impedance spectroscopy. It is found that the substrate corrosion occurred first for the DLC films with open pores, followed by a substrate surface passivation before the final corrosion failure. The DLC film with closed pores can effectively prevent Cl− from attacking the substrate before the corrosion pits formed at the local defects.