| 引用本文: | 王洪涛,纪岗昌,陈清宇,白小波,富伟,陈枭.超音速火焰喷涂Cr3C2-NiCr涂层腐蚀冲蚀磨损特性[J].材料科学与工艺,2011,19(6):80-85.DOI:10.11951/j.issn.1005-0299.20110615. |
| WANG Hong-tao,JI Gang-chang,CHEN Qing-yu,BAI Xiao-bo,FU Wei,CHEN Xiao.Corrosion and erosion wear characteristics of HVOF sprayed Cr3C2-NiCr coating[J].Materials Science and Technology,2011,19(6):80-85.DOI:10.11951/j.issn.1005-0299.20110615. |
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| 摘要: |
| 在腐蚀冲蚀磨损试验机上,用5%H2SO4和质量分数15%棕刚玉组成的腐蚀-冲蚀磨损介质,对不同燃气流量下HVOF喷涂Cr3C2-25%NiCr涂层腐蚀冲蚀磨损性能进行了试验研究,测定了涂层单位面积失重量随腐蚀冲蚀磨损时间和冲蚀角度的变化,用扫描电镜观察了涂层断面组织形貌,分析了涂层腐蚀冲蚀磨损机制.研究表明,涂层的腐蚀冲蚀磨损累积失重量随时间基本呈线性增加,适中燃气流量所沉积涂层的腐蚀冲蚀磨损率较低,且远低于低碳钢.涂层的腐蚀冲蚀磨损主要表现为早期腐蚀介质对粘结相的优先冲蚀腐蚀和随后碳化物颗粒剥落以及涂层沿层间的裂纹扩展、相互贯通和扁平粒子脱落. |
| 关键词: 超音速火焰喷涂(HVOF) Cr3C2-NiCr涂层 组织结构 腐蚀-冲蚀磨损. |
| DOI：10.11951/j.issn.1005-0299.20110615 |
| 分类号:TG174.44 |
| 基金项目:国家自然科学基金资助项目(50961007,51001056);江西省自然科学基金资助项目(2010GQC0117);江西省教育厅科技项目(GJJ11236,赣教技字[2005]237号) |
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| Corrosion and erosion wear characteristics of HVOF sprayed Cr3C2-NiCr coating |
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WANG Hong-tao, JI Gang-chang, CHEN Qing-yu, BAI Xiao-bo, FU Wei, CHEN Xiao
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JiuJiang Key Laboratory for Green Remanufacture,School of Mechanical and Materials Engineering,JiuJiang University,Jiujang 332005,China
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| Abstract: |
| The corrosion and erosion wear performance of HVOF sprayed Cr3C2-NiCr coatings deposited in three propane flow rate was studied by corrosion and erosion test,in which the mixture of 5 % H2SO4 solution and 15 wt.% brown alumina was used as erodent medium.The variation of accumulated weight loss of per square centimeter coating with the duration and different erosion jet angles were measured,and the microstructure and the worn morphology of the corrosion-erosion coatings were examined by SEM.It was found that the correlation between weight loss of per square centimeter coating and duration is basically shown linear relation,and the corrosion-erosion rate of this coating in low jet angle is much lower than that of in high jet angle.Moreover,the corrosion-erosion rate of this coating is lower than that of carbon steel.The coating deposited under the condition of moderate propane flow exhibits relatively lower corrosion-erosion wear rate.It is revealed that the corrosion-erosion wear of HVOF sprayed Cr3C2-NiCr coating mainly occurs in the spalling of splats and then the carbide particles peer off.The corrosion and erosion are liable to occur at the micro-crack and porosity.The preferential corrosion-erosion of NiCr binder phase during early stage results in the carbide peeling off subsequently.The initiation,propagation and interconnection of crack result in the spalling of splats finally. |
| Key words: high velocity oxy-fuel spraying(HVOF) Cr3C2-NiCr coating microstructure corrosion-erosion wear |
