Corrosion and wear properties of FeCrMnCoSi HVOF coatings
Corrosion and wear properties of FeCrMnCoSi HVOF coatings
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DOI：
10.1016/j.surfcoat.2018.10.101
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发表时间：
2019-01-15
影响因子：
5.4
通讯作者：
Botta, W. J.
中科院分区：
文献类型：
--
作者：
Koga, G. Y.;Wolf, W.;Botta, W. J.
FeCrMnCoSi涂层（即所谓的CaviTec合金）被认为是一种有效的保护措施，可以延长遭受严重空化侵蚀的钢构件的使用寿命。除了这一要求外，许多应用还要求涂层具有适当的耐腐蚀性和耐磨性。本研究的目的是评估由高速氧燃料（HVOF）生产并沉积在304不锈钢（SS）上的CaviTec涂层的点蚀性和滑动磨损性。在模拟海水中的腐蚀性能表明，这些涂层具有令人满意的耐蚀性，中间片周围的区域是点蚀起始的优先薄弱环节。由于相变诱发塑性（TRIP）效应，在三体系中加入硬马氏体碎屑后，空洞涂层的磨损表现为轻度脱层和严重磨粒磨损。腐蚀磨损试验结果表明，CaviTec涂层在海水介质中具有良好的耐蚀性和良好的干滑动磨损性能，可以拓展其应用领域。
FeCrMnCoSi coating (so-called CaviTec alloy) is recognized as an efficient protective measure to extend the service-life of steel components subjected to severe cavitation erosion. Besides this requirement, many applications also demand coatings with proper corrosion and wear resistances. The aim of this study is to evaluate the pitting corrosion and the sliding wear resistances of CaviTec coatings produced by high-velocity oxygen fuel (HVOF) and deposited onto a 304 stainless steel (SS). The corrosion performances in simulated seawater indicated that these coatings exhibit satisfactory corrosion resistance with regions around the inter-splats representing the preferential weak links sites for pitting corrosion initiation. CaviTec coating wear is characterized by mild delamination followed by severe abrasive wear once the hard-martensitic debris are added in the tri-bosystem due to the transformation induced plasticity (TRIP) effect. Corrosion and wear results point out that the CaviTec coatings, originally developed to possess high cavitation erosion resistance, also present satisfactory corrosion resistance in seawater-like medium and interesting dry sliding wear performance, which can extend their application domain.