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| 摘要: |
| 制备了高速火焰喷涂NiCrBSi／WC涂层及其带有开裂缺陷的涂层，测试了这两种涂层的热腐蚀性能，观察了涂层腐蚀前后的组织形貌，并分析了涂层腐蚀后的相组成及元素含量。结果表明：完整的NiCrBSi／WC涂层具有良好的耐热腐蚀性能，带有开裂缺陷的涂层耐蚀性能显著下降，在电站运行至一个大修期时，开裂涂层的热腐蚀增重比完整涂层增加了307％，腐蚀速度比完整涂层增加了550％；NiCrBSi／WC涂层耐蚀性能良好的主要原因是涂层表面生成的致密Cr2O3薄膜阻止了腐蚀的进一步深入，开裂涂层耐蚀性能下降的主要原因是在开裂处生成了疏松的氧化铁。 |
| 关键词: 涂层 开裂缺陷 NiCrBSi/WC 热腐蚀性能 |
| DOI： |
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| The Corrosion Resistance Study of NiCrBSi/WC Coating and Cracked Coating |
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XU Run-sheng1,2，XU Bin-shi1，LIU Xiao-ming2
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| Abstract: |
| The NiCrBSi/WC coatings and cracked coatings were prepared by HVOF. The corrosion resistance of these coatings was determined. The microstructure of the coatings before and after hot corrosion was observed, the phases and composition of these corroded coatings were analyzed. The results showed that, the corrosion resistance of HVOF NiCrBSi/WC coatings was all-right, but the corrosion resistance of the cracked coatings was deceased greatly. By the end of a heavy repair period for a power station, the weight- gain of the corroded cracked coatings increased 3.07 times that of the corroded coatings without cracks, the corrosion rate is 5.5 times that of the later. The main reason for the excellent corrosion resistance of NiCrBSi/WC coatings was that the compact Cr2O3 film can prevent corrosion effectively, and the decease of corrosion resistance of cracked coatings was due to the existence of porous Fe2O3 in the cracks |
| Key words: coating crack NiCrBSi/WC hot corrosion resistance |
