含氧双层NiCoCr涂层在盐雾-高温交替环境中的循环腐蚀行为及保护机制-中国材料进展

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Title:: Cyclic Corrosion Behavior and Protection Mechanism of Oxygen-Containing Bilayer NiCoCr Coatings in Alternating Salt Spray and High Temperature Environment

文章编号:: 1674-3962(2026)08-0703-10

作者:: 杨悦; 杨莎莎; 陈永君; 李岗飞; 解志文; 王拓; 陈明辉; 王福会; 1.东北大学数字钢铁全国重点实验室，辽宁沈阳 1108192.东北大学材料科学与工程学院，辽宁沈阳 1108193.辽宁科技大学机械工程与自动化学院，辽宁鞍山 1140514.西安昆仑工业(集团)有限公司，陕西西安 710043

Author(s):: YANG Yue; YANG Shasha; CHEN Yongjun; LI Gangfei; XIE Zhiwen; WANG Tuo; CHEN Minghui; WANG Fuhui; 1.State Key Laboratory of Digital Steel, Northeastern University, Shenyang 110819, China2.School of Materials Science and Engineering, Northeastern University,Shenyang 110819, China

关键词:: NiCoCr涂层; 盐雾-高温交替腐蚀; 循环腐蚀; Cr2O3保护膜; 双层纳米晶涂层

Keywords:: NiCoCr coating; salt spray-high temperature alternating corrosion; cyclic corrosion; Cr2O3 protective film; bilayer nanocrystalline coating

分类号:: TG174.4

DOI:: 10.7502/j.issn.1674-3962.202605012

文献标志码:: A

摘要:: 为阐明不同微观结构NiCoCr涂层在盐雾-高温交替环境中的循环腐蚀行为及防护机制，采用中性盐雾（24 h）-高温氧化（800 ℃，5 h）交替循环实验，对316L不锈钢基体及多弧离子镀（AIP）、直流磁控溅射（MS）和直流磁控溅射结合反应溅射（MSO5）工艺制备的3种NiCoCr涂层进行了系统研究。结合质量变化、X射线衍射、扫描电子显微镜、能谱及电化学阻抗谱，分析了不同材料腐蚀产物膜的形成与演化特征。结果表明：4种材料在盐雾-高温交替环境中的长期耐蚀性顺序为MSO5＞MS＞AIP＞316L。316L基体和AIP涂层分别于第90 h和第180 h后进入氧化失重阶段，而MS和MSO5涂层在300 h内始终保持正增重，其中MSO5涂层增重最小且波动最小。150 h后，AIP涂层形成多层疏松氧化膜，MS涂层形成双层氧化膜但局部存在缺陷，而MSO5涂层表面形成了连续致密、以Cr2O3为主的保护膜。300 h后，AIP和MS涂层均出现明显内部氧化，腐蚀深度分别达到40.6和17.7 μm，而MSO5涂层未见明显内部氧化。EIS结果表明，MSO5涂层具有最高的涂层电阻和电荷转移电阻，初始屏障性能最优。研究表明，循环腐蚀抗力的差异本质上源于涂层对腐蚀初期选择性氧化行为及后续膜层演化过程的调控能力。MSO5涂层由于其含氧外层中弥散分布的纳米Cr2O3相，可促进保护性膜层快速建立，抑制Ni、Co非保护性氧化物的过量生成，并在循环过程中维持膜层的连续性与稳定性，从而显著提升其在盐雾-高温交替环境中的耐蚀性能。

Abstract:: To elucidate the cyclic corrosion behavior and protection mechanism of NiCoCr coatings with different microstructures in alternating salt spray and high-temperature environments, a systematic study was conducted on 316L stainless steel substrate and three NiCoCr coatings (by arc ion plating (AIP), magnetron sputtering (MS) and DC magnetron sputtering combined with reactive sputtering （MSO5） method) using a neutral salt spray (24 h)-high temperature oxidation (800 ℃, 5 h) alternating cyclic test. Combined with mass change measurements, X-ray diffraction, scanning electron microscopy,energy dispersive spectroscopy, and electrochemical impedance spectroscopy, the formation and evolution characteristics of corrosion product films on different materials were analyzed. The results indicate that the long-term corrosion resistance ranking of the four materials in the salt spray-high temperature alternating environment was MSO5>MS>AIP>316L. The 316L substrate and AIP coating entered the mass loss stage after 90 h and 180 h, respectively, while the MS and MSO5 coatings maintained positive mass gain throughout 300 h, with the MSO5 coating exhibiting the smallest and most stable mass gain. After 150 h, the AIP coating formed a multi-layered loose oxide film, the MS coating formed a double-layered oxide film with localized defects, whereas the MSO5 coating developed a continuous and dense protective film predominantly composed of Cr2O3. After 300 h, both AIP and MS coatings exhibited significant internal oxidation with corrosion depths reaching 40.6 and 17.7 μm, respectively, while no obvious internal oxidation was observed in the MSO5 coating. EIS results demonstrated that the MSO5 coating possesses the highest coating resistance and charge transfer resistance, indicating optimal initial barrier performance. The study reveals that the difference in cyclic corrosion resistance essentially originates from the coating’s ability to regulate the selective oxidation behavior at the early corrosion stage and the subsequent film evolution process. The MSO5 coating, owing to the dispersed nano-Cr2O3 phase in its oxygen-containing outer layer,promotes the rapid establishment of a protective film, and suppresses excessive formation of non-protective Ni and Co oxides, and maintains film continuity and stability during cyclic exposure, thereby significantly enhancing its corrosion resistance in the salt spray-high temperature alternating environment.

中国材料进展[ISSN:1674-3962/CN:61-1473/TG]

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