Liang Jui-Teng, Lin Hwai-En
Institute of Mechatronic Engineering, National Taipei University of Technology, Taipei 10608, Taiwan.
Graduate Institute of Manufacturing Technology, National Taipei University of Technology, Taipei 10608, Taiwan.
ACS Appl Mater Interfaces. 2024 Dec 11;16(49):68247-68261. doi: 10.1021/acsami.4c13794. Epub 2024 Nov 28.
In this study, Ni-Se intermetallic compound coatings were fabricated using electrodeposition at various process temperatures (40-70 °C). The results show that increasing the process temperature promotes the deposition of Se, which leads to a transition in the crystal phase of the samples from the NiSe phase, prepared under low-temperature conditions, to a NiSe phase. The dissolution rate of Se in pure water from Ni-Se coatings is inversely related to the incorporated Se content, which indicates that the NiSe phase has a higher natural corrosion rate compared to the NiSe phase. Under the influence of an electric field, the corrosion behavior of Ni-Se coatings is dominated by a two-stage reaction involving Se transformation and dissolution. Coatings with a predominant NiSe phase exhibit more severe corrosion behavior compared to those with a predominant NiSe phase, which suggests that the corrosion reaction is enhanced by the electric field. However, because coatings with a predominant NiSe phase contain a higher proportion of Se ions, the dissolution reaction of SeO, generated during the electrochemical reaction, is retarded, thereby inhibiting the progression of the corrosion reaction. Consequently, coatings with a predominant NiSe phase exhibit relatively better corrosion resistance in a water-based electrolyte.
在本研究中，采用电沉积法在不同工艺温度（40 - 70°C）下制备了镍 - 硒金属间化合物涂层。结果表明，提高工艺温度会促进硒的沉积，这导致样品的晶相从低温条件下制备的NiSe相转变为NiSe₂相。镍 - 硒涂层中硒在纯水中的溶解速率与所含硒含量呈反比，这表明NiSe₂相的自然腐蚀速率高于NiSe相。在电场影响下，镍 - 硒涂层的腐蚀行为由涉及硒转化和溶解的两阶段反应主导。与以NiSe相为主的涂层相比，以NiSe₂相为主的涂层表现出更严重的腐蚀行为，这表明电场增强了腐蚀反应。然而，由于以NiSe₂相为主的涂层含有更高比例的硒离子，电化学反应过程中生成的SeO₂的溶解反应受到阻碍，从而抑制了腐蚀反应的进行。因此，以NiSe₂相为主的涂层在水基电解质中表现出相对较好的耐腐蚀性。
