金刚石纳米颗粒对铬涂层微观结构、硬度和耐蚀性的影 响

弗拉 基米, 拉多 斯拉
保加利亚科学院金属科学设备和技术研究所

摘要

在钢上获得了铬和金刚石纳米颗粒的电沉积涂层。铬直接镀在钢基体上，没有任何中间层。研究了电沉积
电流密度、电沉积时间和金刚石纳米颗粒在镀铬电解液中的浓度对镀铬层微观结构、相组成、显微硬度和耐蚀性的
影响。使用 X 射线衍射（XRD）和扫描电子显微镜 - 能量分散 X 射线光谱（SEM-EDS）技术检查了复合涂层（铬和
金刚石纳米颗粒）的相和化学成分。用金相显微镜和显微硬度计检查了显微组织和显微硬度。使用重量法研究了在
3.5wt%NaCl 溶液中的耐腐蚀性。铬涂层与钢基体之间的结合具有扩散特性。在金刚石纳米颗粒浓度为 25g/l 或更高时，
出现单独的不规则形状形成的子层。这些结构的形成仅取决于金刚石纳米颗粒的浓度，而不受其他电沉积参数的影响。
随着电解液中金刚石纳米颗粒浓度的增加，铬涂层沉积速率增加，涂层厚度也相应增加。这种增加是没有纳米金刚
石的铬涂层厚度的两倍多。与未改性铬涂层相比，复合涂层的显微硬度也有所提高。随着金刚石纳米颗粒浓度的增加，
与单铬涂层相比，显微硬度提高了 2 倍，耐蚀性提高了 5 倍。其他电镀参数的值是恒定的。

关键词

金刚石纳米颗粒；铬涂层；电沉积；硬度；腐蚀

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