刘海涛,丁彰雄,黄宝祥,袁成清.Ni基合金喷熔层在NaCl溶液中的抗空蚀性能研究[J].表面技术,2018,47(8):175-181.
LIU Hai-tao,DING Zhang-xiong,HUANG Bao-xiang,YUAN Cheng-qing.Cavitation Erosion Resistance of Ni-based Alloy Sprayed and Fused Coatings in NaCl Solution[J].Surface Technology,2018,47(8):175-181 |
| Ni基合金喷熔层在NaCl溶液中的抗空蚀性能研究 |
| Cavitation Erosion Resistance of Ni-based Alloy Sprayed and Fused Coatings in NaCl Solution |
| 投稿时间：2018-03-22 修订日期：2018-08-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2018.08.025 |
| 中文关键词: 氧乙炔火焰喷熔 镍基合金 组织结构 NaCl 溶液 抗腐蚀性能 空蚀 |
| 英文关键词:oxy-acetylene flame spraying and fusing Ni-based alloy structure NaCl solution corrosion resistance cavitation erosion |
| 基金项目:国家自然科学基金资助项目（51422507） |
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| Author | Institution |
| LIU Hai-tao | Key Laboratory of High Performance Ship Technology (Wuhan University of Technology), Ministry of Education, Wuhan 430063, China |
| DING Zhang-xiong | Key Laboratory of High Performance Ship Technology (Wuhan University of Technology), Ministry of Education, Wuhan 430063, China |
| HUANG Bao-xiang | Key Laboratory of High Performance Ship Technology (Wuhan University of Technology), Ministry of Education, Wuhan 430063, China |
| YUAN Cheng-qing | Key Laboratory of High Performance Ship Technology (Wuhan University of Technology), Ministry of Education, Wuhan 430063, China |
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| 中文摘要: |
| 目的 比较不同系列 Ni 基合金喷熔层在 NaCl 溶液中的抗空蚀性能，并探讨其空蚀机理。方法 采用 XRD 方法分析了氧乙炔火焰喷熔工艺制备的 NiCrBSi、WC 增强 Ni 基、NiCrBSiCuMo 合金喷熔层的组织结构，采用洛氏硬度计测量了喷熔层的硬度，通过 CorrTest 电化学测试系统分析了喷熔层在 3.5%NaCl 溶液中的电化学腐蚀性能，使用超声波振动空蚀仪对喷熔层在 NaCl 溶液中的抗空蚀性能进行了研究。结果 NiCrBSiCuMo 合金喷熔层在 NaCl 溶液中具有优异的抗腐蚀性能。该喷熔层中除含有 Cr23C6、Cr7C3、 Cr3C2、Cr2B 硬质相外，还存在细化涂层组织、改善涂层韧性的 Mo2C 与 MoSi2相，其硬度与 NiCrBSi 合金喷熔层相近（约 58HRC），在 3.5%NaCl 溶液中空蚀 16 h 的累积体积损失分别为 NiCrBSi 和 WC 增强 Ni 基合金喷熔层的 65%与 51%。WC 增强 Ni 基合金喷熔层在含有 NiCrBSi 喷熔层中 Cr 的碳化物、硼化物硬质相的基础上，还含有 WC与 W2C 硬质相，虽然喷熔层具有较高的硬度（59.3HRC），但在 NaCl 溶液中的腐蚀电位较低，腐蚀电流密度最大，抗空蚀性能较差。结论 NiCrBSiCuMo 合金喷熔层在 NaCl 溶液中具有最优异的抗空蚀性能，WC 的加入使 Ni 基合金喷熔层在 NaCl 溶液中的抗空蚀性能减弱。 |
| 英文摘要: |
| The work aims to compare the cavitation erosion resistance of different series of Ni-based alloy sprayed and fused coatings in NaCl solution and explore the coatings’ cavitation mechanism. The sprayed and fused coatings of NiCrBSi, WC-reinforced Ni-based and NiCrBSiCuMo alloy were prepared by oxy-acetylene flame spraying and fusing. The structure, hardness and electrochemical corrosion performance of the coatings in 3.5% NaCl solution were analyzed by XRD, Rockwell hardness tester and electrochemical test system (CorrTest), respectively. Furthermore, resistance of cavitation erosion of the coatings in NaCl solution was studied by ultrasonic vibration cavitation equipment. From the results, NiCrBSiCuMo alloy sprayed and fused coating had excellent corrosion resistance in NaCl solution. It contained not only Cr23C6, Cr7C3, Cr3C2 and Cr2B hardness phases, but also Mo2C and MoSi2 phases which could refine structure and improve toughness of the coating. The coating’s hardness was close to NiCrBSi coating (about 58HRC) and its cumulative volume loss was 65% of NiCrBSi and 51% of WC-reinforced Ni-based alloy coating, respectively. The WC-reinforced Ni-based alloy coating also contained Cr carbide and boride hardness phases in NiCrBSi coating besides WC and W2C hardness phases. Although its hardness was pretty high (59.3HRC), it had relatively low corrosion potential, the highest corrosion current density and the worse erosion resistance in NaCl solution. Thus, NiCrBSiCuMo alloy coating has the best cavitation erosion resistance in NaCl solution and the addition of WC weakens the cavitation erosion resistance of Ni-based alloy coating. |
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