黄锦阳,鲁金涛,周永莉,杨珍.Ni-Cr涂层等离子熔覆制备与高温腐蚀行为研究[J].表面技术,2018,47(4):42-50.
HUANG Jin-yang,LU Jin-tao,ZHOU Yong-li,YANG Zhen.The Preparation of Ni-Cr Coating and the High Temperature Corrosion Behavior with Plasma Powder Cladding Technology[J].Surface Technology,2018,47(4):42-50
Ni-Cr涂层等离子熔覆制备与高温腐蚀行为研究
The Preparation of Ni-Cr Coating and the High Temperature Corrosion Behavior with Plasma Powder Cladding Technology
投稿时间:2017-09-08  修订日期:2018-04-20
DOI:10.16490/j.cnki.issn.1001-3660.2018.04.007
中文关键词:  等离子熔覆  TP304H奥氏体不锈钢  Ni-Cr涂层  烟灰/气  高温腐蚀
英文关键词:plasma cladding  TP304H  Ni-Cr coating  coal ash/flue gas  high temperature corrosion
基金项目:国家自然科学基金项目(51301130,51401163);华能集团科技项目(HNKJ15-H02,HNKJ15-H04)
作者单位
黄锦阳 西安热工研究院有限公司 国家能源清洁高效火力发电技术研发中心,西安 710032 
鲁金涛 西安热工研究院有限公司 国家能源清洁高效火力发电技术研发中心,西安 710032 
周永莉 西安热工研究院有限公司 国家能源清洁高效火力发电技术研发中心,西安 710032 
杨珍 西安热工研究院有限公司 国家能源清洁高效火力发电技术研发中心,西安 710032 
AuthorInstitution
HUANG Jin-yang National Energy R & D Center of Clean and High-efficiency Fossil-fired Power Generation Technology, Xi′an Thermal Power Research Institute Co. Ltd, Xi′an 710032, china 
LU Jin-tao National Energy R & D Center of Clean and High-efficiency Fossil-fired Power Generation Technology, Xi′an Thermal Power Research Institute Co. Ltd, Xi′an 710032, china 
ZHOU Yong-li National Energy R & D Center of Clean and High-efficiency Fossil-fired Power Generation Technology, Xi′an Thermal Power Research Institute Co. Ltd, Xi′an 710032, china 
YANG Zhen National Energy R & D Center of Clean and High-efficiency Fossil-fired Power Generation Technology, Xi′an Thermal Power Research Institute Co. Ltd, Xi′an 710032, china 
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中文摘要:
      目的 为了解决锅炉管烟气侧表面烟灰/气所引起的高温腐蚀、冲刷等问题,制备良好的涂层结构并延长其使用寿命。方法 采用等离子粉末熔覆工艺于TP304H奥氏体不锈钢表面制备Ni-Cr涂层,研究了熔覆参数对涂层组织结构的影响规律,并在模拟锅炉煤粉燃烧烟灰/气环境中分别研究了涂层在650 ℃和750 ℃的腐蚀行为,利用SEM、EDS及XRD等方法分析了熔覆涂层的组织结构、腐蚀产物形貌、元素分布和腐蚀产物物相。结果 Ni-Cr涂层厚度随熔覆电流的增加而增加(最大厚度约1.3 mm),随送粉量的增加出现峰值(约0.93 mm),涂层物相主要由(Ni)和Cr2Ni3相组成。涂层在650 ℃和750 ℃的烟灰/气环境下腐蚀后的耐蚀性明显不同,650 ℃腐蚀后,涂层耐蚀性较好,腐蚀产物层连续完整,主要为富Fe、Cr氧化物,另有极少量的内硫化腐蚀产物;750 ℃腐蚀后,500 h最大腐蚀深度约为650 ℃的4倍,腐蚀产物大量破裂脱落,导致明显的晶间腐蚀。结论 通过控制熔覆电流和送粉量,能够获得组织均匀、呈枝晶生长特征且与基体冶金结合良好的Ni-Cr涂层结构。高Cr含量的涂层对基体合金的抗高温烟灰/气腐蚀性能有良好的保护作用。
英文摘要:
      The work aims to solve the high temperature corrosion and erosion caused by the coal ash/flue gas of boiler flue gas side and prepare excellent coating structure to prolong its service life. Ni-Cr coating was successfully prepared on the surface of TP304H austenitic stainless steel through the plasma powder cladding technology. The influence of cladding parameters on coating microstructures were studied and the corrosion behaviors of Ni-Cr coating were investigated respectively in simulated coal ash/flue gas environment for 650 ℃ and 750 ℃. The microstructures of the cladding coating, and morphologies, compositions and phases of the corrosion products were analyzed using SEM, EDS and XRD. The Ni-Cr coating thickness increased obviously with the increase of cladding current which the maximum thickness is about 1.3 mm and the maximum thickness appeared with the increase of powder feeding rate which is about 0.93 mm. The composition of coating is mainly consisted of (Ni) and Cr2Ni3. The corrosion resistance of Ni-Cr coating are obviously different in the coal ash/flue gas environment for 650 ℃ and 750 ℃. The good corrosion resistance of coating and corrosion products of continuity and integrity are observed at 650 ℃. The oxide of Fe and Cr is the main corrosion products for all of samples, while a small amount of sulfide is discovered. After 750 ℃, the maximum corrosion depth is more than 4 times as long as 650 ℃ for 500 h. The intercrystalline corrosion is primarily resulted due to the collapse of corrosion products. The perfect combinated structure of Ni-Cr coating and matrix, uniform tissue and dendrite growth state, are obtained by controlling the cladding current and powder feeding rate. The high Cr content coating can well protect matrix alloy in the environment of high temperature coal ash/flue gas corrosion.
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