董会,韩燕,付安庆,周勇,李霄.快速激光熔覆Ni/不锈钢堆焊层组织及耐蚀性能研究[J].表面技术,2019,48(5):21-27.
DONG Hui,HAN Yan,FU An-qing,ZHOU Yong,LI Xiao.Microstructure and Corrosion Resistance of Ni/Stainless Steel Surfacing Layer Deposited via High-speed Laser Cladding[J].Surface Technology,2019,48(5):21-27 |
| 快速激光熔覆Ni/不锈钢堆焊层组织及耐蚀性能研究 |
| Microstructure and Corrosion Resistance of Ni/Stainless Steel Surfacing Layer Deposited via High-speed Laser Cladding |
| 投稿时间：2018-12-22 修订日期：2019-05-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2019.05.004 |
| 中文关键词: 快速激光熔覆 堆焊层 点蚀 碳钢 不锈钢 腐蚀 |
| 英文关键词:high-speed laser cladding cladding layer pitting carbon steel stainless steel corrosion |
| 基金项目:西安石油大学“材料科学与工程”省级优势学科（YS37020203）；材料成形与模具技术国家重点实验室开放课题研究基金（P2018-17） |
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| Author | Institution |
| DONG Hui | 1.Xi'an Shiyou University, Xi'an 710065, China |
| HAN Yan | 2.CNPC Tubular Goods Research Institute, Xi'an 710077, China |
| FU An-qing | 2.CNPC Tubular Goods Research Institute, Xi'an 710077, China |
| ZHOU Yong | 1.Xi'an Shiyou University, Xi'an 710065, China |
| LI Xiao | 1.Xi'an Shiyou University, Xi'an 710065, China |
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| 中文摘要: |
| 目的 提高CT90钢耐腐蚀性能的同时，大幅度提升激光熔覆效率。方法 用快速激光熔覆在CT90连续油管表面堆焊一层Ni/不锈钢涂层。用扫描电子显微镜（SEM）及能谱（EDS）研究涂层组织结构特征，用电化学工作站测试涂层耐全面腐蚀和点蚀的能力，通过SEM分析试样表面腐蚀形貌。结果 一次扫描后，CT90连续油管表面制备了一层约200 μm厚的316L/Ni堆焊层，堆焊层由约50 μm厚的扩散区与150 μm厚的涂层区组成。堆焊层致密程度较高，其孔隙率仅约为0.4%，稀释率约为1.7%。熔覆层晶粒主要以柱状晶的方式垂直于熔覆层/基体界面生长，表面存在少量等轴晶区和板条形貌的晶粒。与涂层区晶粒内部相比，涂层区晶界处的Cr含量降低约1.2%。熔覆316L/Ni堆焊层后，CT90连续油管的自腐蚀电位升高约0.55 V，自腐蚀电流密度降低约95%，点蚀电位约为0.34 V。电化学测试后，CT90试样表面腐蚀严重，而熔覆层大部分区域仍保持测试前形态，少量区域发生局部腐蚀，腐蚀区域呈现蜂窝形貌。结论 快速激光熔覆在保证熔覆层低孔隙率、高致密度、低稀释的同时，还显著提升了激光熔覆的生产效率。涂层能够显著提升CT90钢耐全面腐蚀及局部腐蚀的能力，使得CT90钢的腐蚀形式发生变化。 |
| 英文摘要: |
| The work aims to improve the corrosion resistance of CT90 coiled tubing and the efficient of the lase cladding. The Ni/316L cladding layer was deposited on CT90 coiled tubing via high-speed laser cladding. The microstructure of cladding was addressed by scanning electron microscope (SEM) and energy dispersive spectrum (EDS). The elentrochemical workshop was employed to test the resistances of general corrosion and pitting corrosion of the cladding and then the corrosion morphology was represented through SEM. The Ni/316L cladding layer with thickness of 200 μm could be deposited on CT90 coiled tubing after once scanning. The cladding layer contained 50 μm thick diffusion region and 150 μm thick coating. The cladding layer was dense and the porosity was only about 0.4%. In addition, the dilution rate was approximately 1.7%. The columnar grains in cladding mainly grew perpendicular to the interface of cladding layer/matrix, and there were a few equiaxed grains and slatted grains around the surface of cladding layer. Compared with the inner of grain in coating area, the Cr element content at grain boundary in coating area decreased about 1.2%. The corrosion potential of Ni/316L cladding layer increased about 0.55 V after high-speed laser cladding. Additionally, the corrosion current density decreased about 95%. The pitting potential of the cladding layer was about 0.34 V. The CT90 corrosion was seriously after electrochemistry test, while the most regions of cladding still remained the morphology before test except a few local corrosion areas. The corrosion regions of cladding surface exhibited faveolated morphology. The high-speed laser cladding not only can deposit the coating with characteristics of low porosity, densification, low dilution rate, but also dramatically improve the efficiency of laser cladding. Both the general corrosion resistance and the local corrosion resistance of CT90 coiled tubing improves dramatically via 316L/Ni coating deposited by high-speed laser cladding. Meanwhile, the corrosion mode changes after deposition of 316L/Ni cladding. |
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