Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 19    No. 5    October 2009

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O, xidation and hot corrosion behaviors of HVAF-sprayed conventional and nanostructured NiCrC coatings
TAO Kai(陶 凯)1, ZHOU Xiang-lin(周香林)1, CUI Hua(崔 华)2, ZHANG Ji-shan(张济山)1

1. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing,
Beijing 100083, China
2. School of Materials Science and Engineering, University of Science and Technology Beijing,
Beijing 100083, China

Abstract:The oxidation and hot corrosion behaviors of HVAF-sprayed conventional and nanostructured NiCrC coatings were studied. The oxidation experiment was conducted in air, and the hot corrosion was conducted in the Na2SO4-30%K2SO4 environment, in the temperature range of 550−750 ℃ for periods up to 160 h. The corrosion kinetics was tested with the thermogravimetric method. The corrosion products were characterized by scanning electron microscopy(SEM), energy dispersive X-ray spectroscopy (EDX) and X-ray diffractometry (XRD). As indicated by the results, both types of coatings possess high corrosion resistance, especially the nanostructured NiCrC coating. The enhanced grain boundary diffusion in the nanostructured coating not only promotes the formation of a denser Cr2O3 scale with a higher rate, but also helps to mitigate the Cr depletion at the metal/scale interface. The less porosity of the nanostructured coating is also thought to be beneficial to the anti-corrosion properties.

 

Key words: corrosion; nanocrystalline materials; coating; thermal spray; nickel-based alloys

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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