邹云鹤,王健,谭勇,徐飞,孙杰.热喷涂NiCrAl涂层在不同基体上腐蚀行为研究[J].表面技术,2025,54(8):107-115.
ZOU Yunhe,WANG Jian,TAN Yong,XU Fei,SUN Jie.Corrosion Behavior of Thermal Spraying NiCrAl Coating on Different Substrates[J].Surface Technology,2025,54(8):107-115 |
| 热喷涂NiCrAl涂层在不同基体上腐蚀行为研究 |
| Corrosion Behavior of Thermal Spraying NiCrAl Coating on Different Substrates |
| 投稿时间：2024-07-12 修订日期：2024-10-18 |
| DOI：10.16490/j.cnki.issn.1001-3660.2025.08.009 |
| 中文关键词: 大气等离子喷涂 NiCrAl涂层 电偶腐蚀 小波分析 |
| 英文关键词:APS NiCrAl coating galvanic corrosion wavelet analysis |
| 基金项目: |
| 作者 | 单位 |
| 邹云鹤 | 沈阳理工大学 环境与化学工程学院，沈阳 110159 |
| 王健 | 沈阳理工大学 环境与化学工程学院，沈阳 110159 |
| 谭勇 | 沈阳理工大学 环境与化学工程学院，沈阳 110159 |
| 徐飞 | 沈阳理工大学 环境与化学工程学院，沈阳 110159 |
| 孙杰 | 沈阳理工大学 环境与化学工程学院，沈阳 110159 |
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| Author | Institution |
| ZOU Yunhe | School of Environmental and Chemical Engineering, Shenyang Ligong University, Shenyang 110159, China |
| WANG Jian | School of Environmental and Chemical Engineering, Shenyang Ligong University, Shenyang 110159, China |
| TAN Yong | School of Environmental and Chemical Engineering, Shenyang Ligong University, Shenyang 110159, China |
| XU Fei | School of Environmental and Chemical Engineering, Shenyang Ligong University, Shenyang 110159, China |
| SUN Jie | School of Environmental and Chemical Engineering, Shenyang Ligong University, Shenyang 110159, China |
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| 中文摘要: |
| 目的 探究热喷涂NiCrAl涂层的腐蚀行为，并对比该涂层与2种不同基体形成电偶对时的电偶腐蚀大小。方法 使用大气等离子热喷涂(APS)方法在FeCoNi高温合金和(1Cr11Ni2W2MoV)不锈钢基体上分别制备了NiCrAl涂层。使用扫描电子显微镜(SEM)、3D共聚焦显微镜(CLSM)、X射线衍射仪(XRD)和电化学测试(开路电位测试(OCP)、动电位极化曲线测试和电偶腐蚀试验)对涂层-金属电偶体系在3.5%(质量分数)NaCl溶液中的腐蚀行为进行了研究。结果 随着浸泡时间的增加，NiCrAl涂层的孔隙率和面粗糙度先减小后增大，并且在240 h浸泡后的涂层截面发现了明显的腐蚀通道。动电位极化曲线表明，NiCrAl-不锈钢体系具有较低的腐蚀电位。电偶腐蚀试验表明，当NiCrAl涂层分别与2种基体形成电偶对时，NiCrAl-FeCoNi高温合金电偶对具有较小的平均电偶电流密度。使用四阶正交Daubechies小波变换(db4)，将NiCrAl-FeCoNi高温合金电偶对和NiCrAl-不锈钢电偶对的电偶电流数据分解为D1~D8晶体(细节系数)和S8晶体(光滑系数)，通过对比2组电偶对的小波能量分布图(EDP)来分析电偶对的电化学活性，结果表明NiCrAl-FeCoNi高温合金电偶对的电偶电流在离散小波分析中具有较低的D系晶体能量，说明该电偶对有较低的电化学活性。结论 综上所述，由于腐蚀介质的不断破坏以及NiCrAl涂层的相间电偶腐蚀，在浸泡240 h后腐蚀介质穿透涂层对基体造成了腐蚀。与NiCrAl涂层-不锈钢电偶对相比，NiCrAl涂层-FeCoNi高温合金电偶对有较低的电化学活性。 |
| 英文摘要: |
| Abradable seal coating (ASC) has a porous, multi-layer and multi-phase structure. When the ASC is in a corrosive environment, the galvanic corrosion of the substrate-bonding coating or the bonding coating-top coating becomes an important reason for accelerating the failure of the ASC system. At present, NiAl bonding coating is usually used as bonding layer in ASC system, but the research on galvanic corrosion between NiCrAl bonding coating and substrate is lacking. In this study, NiCrAl coatings were prepared on FeCoNi superalloy and (1Cr11Ni2W2MoV) stainless steel substrates by atmospheric plasma spraying (APS). The measurement methods, including scanning electron microscopy (SEM), 3D confocal laser scanning microscope (CLSM), X-ray diffraction (XRD) and electrochemical tests (open circuit potential test (OCP), potentiodynamic polarization curve test and galvanic corrosion test), were used to characterize the corrosion behaviors of NiCrAl bonding coating, and the galvanic corrosion behaviors of NiCrAl bonding coating on FeCoNi superalloy and stainless steel substrates in 3.5wt.% NaCl solution. The results showed that partial phase transformation of NiCrAl powder occurred after spraying, and the formation of Al2O3 increased the corrosion resistance of the coating. The NiCrAl coatings for different immersion time were observed by CLSM, and the results of CLSM were processed by image method. The results showed that the porosity and surface roughness of NiCrAl coating decreased firstly and then increased. Combined with the micro-morphology and energy spectrum of NiCrAl coating surface for different immersion time, this was due to the accumulation of corrosion products on the surface of the coating in the pores at the early stage of immersion, and the cracking and shedding of corrosion products at the later stage of immersion. After 240 hours of immersion, clear corrosion channels were observed at the cross section of the coating, indicating that the substrate had been corroded. The experimental results showed that when the corrosive medium reached the interface between the coating and the substrate through the corrosion channel, local micro-galvanic corrosion became the main cause of corrosion. The results of the potentiodynamic polarization curve analysis indicated that, compared with NiCrAl-FeCoNi superalloy, NiCrAl-stainless steel system had lower corrosion potential. |
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