Microstructure and corrosion behavior of Fe-based amorphous coating prepared by HVOF
Microstructure and corrosion behavior of Fe-based amorphous coating prepared by HVOF
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DOI：
10.1016/j.jallcom.2017.06.046
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发表时间：
2017-10-15
影响因子：
6.2
通讯作者：
Deng, Changguang
中科院分区：
文献类型：
--
作者：
Zhang, Jifu;Liu, Min;Deng, Changguang
采用超音速火焰喷涂技术制备了铁基非晶粉末非晶涂层。采用XRD、SEM、TEM等分析手段对涂层的微观结构和相组成进行了表征。结果表明，尽管超音速火焰的温度远高于非晶粉末的晶化温度，但仍能有效地制备出由近非晶相和纳米晶相组成的涂层。在纳米晶的形成过程中，Fe元素被贫化，而Cr元素被富集。采用电化学循环阳极极化法研究了涂层在3.5wt%NaCl水溶液中的耐点蚀性能。结果表明，铁基非晶涂层的点蚀电位（E-pit）和点蚀保护电位（Epp）明显高于不锈钢和热喷涂WC涂层，表明铁基非晶涂层可提高海洋环境下服役零件的耐点蚀性能。(C)2017爱思唯尔B.V.保留所有权利。
Amorphous coatings were deposited by High Velocity Oxygen Fuel (HVOF) spraying using Fe-based amorphous powder for pitting corrosion resistance. The microstructure and phase component of coatings were characterized by XRD, SEM and TEM. It was found that although the temperature of supersonic flame was much high than the crystallization temperature of amorphous powder, a coating constituted of nearly amorphous phase and nanocrystalline phase was prepared efficiently. In the process of nanocrystalline formation, the Fe element was observed depleted while Cr element was enriched. The pitting corrosion resistance of the coating was investigated in 3.5 wt%NaCI aqueous electrolytes using electrochemical cyclic-anodic-polarization measurements. The results showed the pitting potential(E-pit) and pitting protection potential(Epp) of Fe-base amorphous coating were obviously high than that of stainless steel and thermal spraying WC coating, implying pitting corrosion resistance of parts served in marine environment can be improved by Fe-base amorphous coating. (C) 2017 Elsevier B.V. All rights reserved.