Effects of structural relaxation and crystallization on the corrosion resistance of an Fe-based amorphous coating
Effects of structural relaxation and crystallization on the corrosion resistance of an Fe-based amorphous coating
复制标题
结构弛豫和结晶对铁基非晶涂层耐腐蚀性的影响
DOI：
10.1016/j.jnoncrysol.2020.120378
复制
发表时间：
2020-12-15
影响因子：
3.5
通讯作者：
Song, Mengbin
中科院分区：
文献类型：
--
作者：
Kang, Yonghai;Chen, Youming;Song, Mengbin
采用高速氧燃料技术制备了Fe48Cr15Mo14C15B6Y2非晶态涂层。得到的涂层分别在500℃和700℃下进行热处理，以诱导结构松弛和结晶。然后考察了这些因素对涂层耐S腐蚀性能的影响。结果表明，结构松弛后，涂层的耐蚀性有所提高，这是由于钝化膜具有较高的稳定性。相反，涂层在晶化后的耐蚀性下降，因为碳化铬晶体的形成会降低钝化膜的稳定性，并导致贫铬区，在那里它们很容易受到凹坑的侵蚀，特别是在液滴的界面和结合处。
An Fe48Cr15Mo14C15B6Y2 amorphous coating was fabricated using high-velocity oxygen fuel (HVOF) technology. The obtained coating was annealed at 500 degrees C and 700 degrees C to induce structural relaxation and crystallization, re-spectively. Then, the influences on the coating ' s corrosion resistance were investigated. The results demonstrate that the corrosion resistance of the coating is enhanced after structural relaxation, which can be attributed to the higher stability of the passive film. In contrast, the corrosion resistance of the coating is deteriorated after crystallization because the formation of crystals of chromium carbides may decrease the stability of the passive film and result in Cr-depleted zones where they could be easily attacked by pits, especially at the interfaces and junctions of the droplets.