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| HVAF喷涂Inconel625涂层在生物质发电环境的高温腐蚀行为 |
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杨二娟1, 刘福广1, 常绍峰2, 谷永辉2, 蒋生喜2, 张庆和2, 雒晓涛3, 李长久3
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1.西安热工研究院有限公司, 西安 710054;2.华能吉林发电有限公司农安生物质发电厂, 长春 130012;3.西安交通 大学 金属材料强度国家重点实验室, 西安 710049
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| 摘要: |
| 秸秆等生物质焚烧发电时产生的含氯气体和碱金属氯化物腐蚀使受热面金属管道的服役寿命比煤电机组显著降低。 管材表面堆焊镍基耐腐蚀合金的技术尽管可显著提高管道服役寿命,但存在工作效率低、不适合现场施工、管道热变形等诸多问题。 采用可现场施工的空气超音速火焰喷涂(HVAF)在 TP347H 耐热钢表面,制备了 Inconel 镍基耐高温腐蚀涂层,研究了 TP347H 耐热钢喷涂 Inconel 625 合金涂层前后的长期高温腐蚀特性(550 ℃ ,500 h),验证了 HVAF Inconel 625 合金涂层的高温含氯腐蚀防护作用。 显微观察结果表明,优化工艺参数条件下 HVAF 涂层组织致密、 孔隙率低至 0. 72%,与基材结合良好。 腐蚀增重结果表明,采用 HVAF 制备 Inconel 625 合金涂层后,TP347H 耐热钢的腐蚀增重降低 7. 6 倍,耐腐蚀性能显著提升。 冲蚀试验结果表明,HVAF Inconel 625 合金涂层在最初阶段由于表层凸起颗粒的剥落而冲蚀性能极低,进入稳定阶段后耐冲蚀性能提高,与 TP347H 基材的耐冲蚀性能相当。 |
| 关键词: 生物质焚烧发电 空气超音速火焰喷涂 (HVAF) Inconel 625 涂层 高温腐蚀行为 |
| DOI：10.11933/j.issn.1007-9289.20200222002 |
| 分类号:TG178 |
| 文章编号:1007-9289(2020)04-0136-09 |
| 文献标识码:A |
| 基金项目:中国华能集团科技项目(HNKJ19-H22) |
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| Hot Corrosion Behavior of HVAF Sprayed Inconel 625 Coating at Straw Incineration Power Generation Conditions |
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Yang Erjuan1, Liu Fuguang1, Chang Shaofeng2, Gu Yonghui2, Jiang Shengxi2, Zhang Qinghe2, Luo Xiaotao3, Li Changjiu3
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1.Xi’an Thermal Power Research Institute Co., Ltd., Xi’an 710054 , China;2.Nongan Biomass Power Plant of Huaneng Jilin Power Generation Co., Ltd., Changchun 130012 , China;3.State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049 , China
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| Abstract: |
| The combination of HCl gas and alkali-chloride makes the hot corrosion rate of the heated side components in the straw incineration much faster than that in the conventional coal fired boiler condition. It is demonstrated that though arc surfa- cing Ni-based corrosion resistant layer can effectively improve the lifetime of the heat resistance steel tubes, but there exists lots of problems such as low work efficiency, cannot be in-sited used for the boilers and hot deformation of pipelines. High velocity air fuel (HVAF) spray was applied on TP347H heat resistance steel to evaluate the corrosion protection effect of the present coating. Long-term (550℃ for 500 h) hot corrosion was performed for both the bare and coated TP347H steel specimens and the hot chlorine-containine corrosion protection effect of HVAF Inconel 625 coating was verified. The microstructure observation re- sults show that the HVAF coating reveals a dense microstructure with porosity as low as 0. 72% and well bonds to the substrate. The corrosion rate test result indicates that after coated with HVAF Inconel 625, a dramatic 7. 6 times decrease in the corrosion rate is achieved for TP347H steel and its corrosion resistance is significantly reduced. The erosion test result indicates that the e-rosion resistance of the HVAF Inconel 625 coating is lower at the beginning due to the peel-off of surface convex particles but is comparable with that of the TP347H steel substrate in the stable state. |
| Key words: straw incineration power high velocity air fuel (HVAF) Inconel 625 coating hot corrosion behavior |