Wear and Corrosion Resistance of Fe-Based Coatings Reinforced by TiC Particles for Application in Hydraulic Systems
Wear and Corrosion Resistance of Fe-Based Coatings Reinforced by TiC Particles for Application in Hydraulic Systems
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DOI：
10.1007/s11666-015-0316-1
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发表时间：
2016-01-01
影响因子：
3.1
通讯作者：
Malik, K. M.
中科院分区：
文献类型：
--
作者：
Bobzin, K.;Oete, M.;Malik, K. M.
TiC颗粒增强的热喷涂铁基涂层是WC/CoCr、Cr3C2/NiCr和硬铬涂层等硬质合金涂层的一种经济有效的替代品。它们具有良好的耐磨性，并且具有足够数量的合金元素，如Cr和ni，也具有很高的耐腐蚀性。在液压系统中，活塞通常涂有硬铬涂层，以防止腐蚀和磨损。新型水基液压油需要对涂层系统进行改造。为了研究Fe/TiC的耐磨性和耐蚀性，采用HVOF法制备了一种由FeCr27Ni18Mo3基体和34 wt.% TiC组成的新型粉末，并与WC/CoCr （HVAF）和硬铬制成的参考样品进行了比较。除了对涂层进行深入表征（金相分析、电子探针分析仪- empa）外，还测试了水基液压油在反向滑动下的耐磨性。新型Fe/TiC涂层具有良好的磨损保护性能，可与WC/CoCr （HVAF）涂层和电镀硬铬涂层相媲美。耐腐蚀性是通过在面向应用的电解质（60℃的液压流体，RT的人工海水）中的极化来确定的。所研究的铁基涂层在60℃时的耐腐蚀性优于参考涂层。选定的涂层在一个面向应用的液压试验台上进行了测试，用HFC液压油（水聚合物溶液）作为硬铬涂层的参考，显示出相当好的耐磨性和耐腐蚀性。
Thermally sprayed Fe-based coatings reinforced by TiC particles are a cost-effective alternative to carbide coatings such as WC/CoCr, Cr3C2/NiCr, and hard chrome coatings. They feature a good wear resistance and-with sufficient amount of alloying elements like Cr and Ni-also a high corrosion resistance. In hydraulic systems, the piston is usually coated with hard chrome coatings for protection against corrosion and wear. New water-based hydraulic fluids require an adaption of the coating system. In order to investigate the wear and corrosion resistance of Fe/TiC, a novel powder consisting of a FeCr27Ni18Mo3 matrix and 34 wt.% TiC was applied by HVOF and compared to reference samples made of WC/CoCr (HVAF) and hard chrome. Besides an in-depth coating characterization (metallographic analyses, electron microprobe analyzer-EMPA), wear resistance was tested under reverse sliding in a water-based hydraulic fluid. The novel Fe/TiC coatings showed good wear protection properties, which are comparable to conventional coatings like WC/CoCr (HVAF) and electroplated hard chrome coatings. Corrosion resistance was determined by polarization in application-oriented electrolytes (hydraulic fluid at 60 degrees C, artificial sea water at RT). The corrosion resistance of the investigated iron-based coatings at 60 degrees C was superior to the references coatings for both hydraulic fluids. Selected coatings were tested in an application-oriented hydraulic test bench with HFC hydraulic fluid (water polymer solutions) showing comparably good wear and corrosion resistance as the hard chrome-coated reference.