欧阳昌耀,李艳玲,王蕊,白峭峰,闫献国,张建广.304钢表面激光熔覆Stellite12钴基涂层组织及腐蚀性能[J].表面技术,2022,51(11):295-304.
OUYANG Chang-yao,LI Yan-ling,WANG Rui,BAI Qiao-feng,YAN Xian-guo,ZHANG Jian-guang.Microstructure and Corrosion Properties of Laser Cladding Stellite12 Coating on 304 Steel[J].Surface Technology,2022,51(11):295-304
304钢表面激光熔覆Stellite12钴基涂层组织及腐蚀性能
Microstructure and Corrosion Properties of Laser Cladding Stellite12 Coating on 304 Steel
  
DOI:10.16490/j.cnki.issn.1001-3660.2022.11.028
中文关键词:  激光熔覆  Stellite12涂层  304不锈钢  电化学腐蚀  腐蚀机理
英文关键词:laser cladding  stellite12 alloy coating  304 stainless steel  electrochemical corrosion  corrosion mechanism
基金项目:山西省重点研发计划项目(201903D121051);陕西省自然科学基础研究计划项目(2020JM-713);西安航空职业技术学院院级重点项目(18XHZY-04)
作者单位
欧阳昌耀 太原科技大学,太原 030024 
李艳玲 太原科技大学,太原 030024 
王蕊 太原科技大学,太原 030024;河北工程大学,河北 邯郸 056009 
白峭峰 太原科技大学,太原 030024 
闫献国 太原科技大学,太原 030024 
张建广 西安航空职业技术学院 汽车工程学院,西安 710089 
AuthorInstitution
OUYANG Chang-yao Taiyuan University of Science and Technology, Taiyuan 030024, China 
LI Yan-ling Taiyuan University of Science and Technology, Taiyuan 030024, China 
WANG Rui Taiyuan University of Science and Technology, Taiyuan 030024, China;Hebei University of Engineering, Hebei Handan 056009, China 
BAI Qiao-feng Taiyuan University of Science and Technology, Taiyuan 030024, China 
YAN Xian-guo Taiyuan University of Science and Technology, Taiyuan 030024, China 
ZHANG Jian-guang School of Automotive Engineering, Xi'an Aviation Vocational and Technical College, Xi'an 710089, China 
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中文摘要:
      目的 对304不锈钢表面强化处理来提高其耐腐蚀性能。方法 使用激光熔覆技术将Stellite12涂层制备在304钢基体上。使用光学显微镜(OM)、扫描电子显微镜(SEM)、能谱仪(EDS)、X射线衍射(XRD)、三电极电化学工作站对涂层显微组织、元素分布、物相、电化学腐蚀行为进行测试与分析,并对涂层和304不锈钢的耐腐蚀性能进行了对比分析。结果 涂层物相主要由面心立方结构a-Co固溶体、CoCx等化合物组成。由于温度梯度和凝固速度的不同,熔覆层截面下、中、上部呈现出了不同的组织形貌特征:依次由平面晶、胞状晶、树枝晶、细小树枝晶组成。涂层枝晶间为Co和碳化物的共晶组织,枝晶内主要为a-Co的初生相。在进行电化学腐蚀后,涂层的自腐蚀电位为‒504.5 mV,304钢的自腐蚀电位为‒579.7 mV,涂层的腐蚀电位较304钢偏正,比304钢耐腐蚀。涂层表面出现了腐蚀点,腐蚀点位分布均匀、且程度较轻。304钢表面发生了严重的腐蚀,明显可见深度和面积较大的腐蚀孔洞。结论 Stellite12合金涂层能够有效地提高304不锈钢表面耐腐蚀性能。
英文摘要:
      In practical applications, 304 stainless steel is prone to pitting and crevice corrosion damage, which will adversely affect the performance of the product. In order to further improve the corrosion resistance and other related properties of 304 stainless steel, surface modification treatment can be carried out on it. At present, the surface modification treatment of laser cladding technology is widely used at home and abroad. The test used a 304 stainless steel plate as the cladding substrate, and the cladding material was Stellite12 alloy powder with an average particle size of 45 μm and a spherical powder morphology. After many experimental studies, the processing parameters were set to a laser power of 1 400 W, a spot diameter of 3 mm, and a scanning speed of 15 mm/s. Field emission scanning electron microscope SEM (FEI, ZEISS) and OXFORD Ultim Extreme energy spectrometer (EDS) were used to observe the microstructure morphology of the coating, the corrosion morphology of the coating and the substrate, and element analysis. An Empyrean X-ray diffractometer was used to determine the phase structure of the coating. An electrochemical workstation with RST5000 three-electrode system was used to conduct electrochemical experiments on the samples. The overall surface of the stellite12 coating was light green, and the overall perfection of the coating showed no obvious defects. The penetrant inspection of the sample did not find defects such as coating surface cracks, and the coating surface roughness Ra=40.1 μm. The upper, middle and lower parts of the coating cross-section showed different microstructure characteristics. The cross-section elements of the coating had abrupt changes in the transition zone, which proved that the coating and the substrate were diluted under strong metallurgical bonding. The dilution rate was calculated to be about 16.9% based on the composition of Fe element in the coating. The coating surface was mainly columnar crystals, small planar crystals, and short dendrites. Compared with the cross-section of the coating, the growth direction of the surface structure of the coating became more disordered. This was because the surface coating had a wide molten pool area and more diversified heat dissipation. The main phase of the coating was a-Co, CoCx and other compounds. The open circuit potential, Tafel polarization curve, Nyquist plot, and Bode plot of the coating and the substrate in the 3.5wt.% sodium chloride test solution. It can be seen from the figure that the open circuit potential measured by the coating and the substrate remains in a stable state, the self-corrosion potential of the coating was ‒504.5 mV, and the self-corrosion potential of the substrate was ‒579.7 mV. The corrosion potential of the coating was more positive than that of the substrate, and it was more resistant to corrosion than the substrate. At the same time, the annual corrosion rate of the coating was 0.002 mm/a far less than the substrate rate of 0.05 mm/a. A Stellite12 coating was prepared on a 304 stainless steel substrate, and the structure, phase and electrochemical corrosion performance of the coating and the substrate are studied. The interdendritic was a eutectic structure of Co and carbides, and the primary phase of a-Co was mainly contained in the dendrites. The main components of the coating phase were a-Co, CoCx and other compounds. The self-corrosion potential of the coating was ‒504.5 mV, and the self-corrosion potential of the substrate was ‒579.7 mV. The corrosion potential of the coating was more positive than that of the substrate. Stellite12 coating can improve the corrosion resistance of 304 stainless steel.
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