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模拟海水环境中CuSn8P合金不同组织的 腐蚀行为研究
Corrosion Behavior of CuSn8P Alloy with Different Microstructures in a Simulated Seawater Environment
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- DOI:
- 作者:
- 王明立1，刘文峰1，张金勇1，2，王政皓1，樊江昆2，王利飞3，陈 正1，陈保磊4，张继光4
WANGMingli1, LIU Wenfeng1, ZHANG Jinyong1,2, WANG Zhenghao1, FAN Jiangkun2, WANG Lifei3, CHENZheng1
- 作者单位:
- 1. 中国矿业大学材料与物理学院，江苏徐州221116；2.西北工业大学凝固技术国家重点实验室，陕西西安710072； 3. 太原理工大学材料科学与工程学院，山西太原030024；4.徐州徐工基础工程机械有限公司，江苏徐州221004
1. School of Materials and Physics, China University of Mining and Technology, Xuzhou 221116, China; 2. State Key Laboratory of Coagulation Technology, Northwestern Polytechnical University, Xi'an 710072, China; 3. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China; 4. Xuzhou XCMG Foundation Construction Machinery Co., Ltd., Xuzhou 221004, China
- 关键词:
- CuSn8P 合金；微观组织；腐蚀性能；腐蚀机理
CuSn8P alloy; microstructure; corrosion performance; corrosion mechanism
- 摘要:
- CuSn8P合金作为某工程机械设备传动零部件的材料，工作在含有腐蚀介质环境，服役时要求其具有较高 的耐蚀性。 因此， 对其开展腐蚀行为和腐蚀机制研究具有重要的工程意义。 通过电化学腐蚀试验， 研究不同组织的 CuSn8P 合金在模拟海水环境下(3.5%NaCl 溶液，质量分数)的腐蚀行为。 利用 OM、XRD、SEM 等表征手段，分析 CuSn8P 合金的微观组织、 极化曲线、 阻抗图谱及腐蚀形貌， 探讨其腐蚀方式与机理。 结果表明， 铸态CuSn8P合金 (CuSn8P-CS)由 α 相与(α+δ)共析体组成的树枝晶构成，加工态 CuSn8P 合金(CuSn8P-PS)由等轴 α 相及其形变孪晶组 成。CuSn8P-PS 的腐蚀电流密度低(2.596×10-5A/cm2)，腐蚀电位高(-0.943 V)，表现出良好的耐蚀性。CuSn8P-PS 主要发生 点蚀，而CuSn8P-CS 则发生均匀腐蚀。 腐蚀产物为Cu2 O和Cu2 (OH)3 Cl，形成 Cu2 (OH)3 Cl+Cu2 O 双层保护膜，赋予合金 优良的耐蚀性能。CuSn8P alloys, which are used as important materials for the transmission of engineering machinery equipment, operate in environments containing corrosive media. During its service life, it is required to have high corrosion resistance. Thus, research on its corrosion behavior and corrosion mechanism holds significant engineering significance. In this work, the corrosion behavior of CuSn8P alloys with different organizations in a simulated seawater environment (3.5 wt.% NaCl solution) was investigated via electrochemical corrosion tests. The microstructure, polarization curves, impedance spectra and corrosion morphology of the CuSn8P alloy were analysed via OM, XRD, SEM and other characterization methods to explore the corrosion mode and mechanism. The results show that the as-cast CuSn8P alloy (CuSn8P-CS) consists of dendritic crystals composed of an α-phase and (α+δ) eutectic, and the CuSn8P alloy in processing state(CuSn8P-PS) consists of an equiaxed α-phase and deformed twin crystals. The corrosion current density of CuSn8P-PS is low (2.596×10-5 A/cm2), and the corrosion potential is high (-0.943 V), indicating good corrosion resistance. Pitting corrosion mainly occurs in CuSn8P-PS, whereas uniform corrosion occurs in CuSn8P-CS. The corrosion products are Cu2 O and Cu2 (OH)3 Cl, forming a Cu2 (OH)3 Cl+Cu2 O double-layer protective film, which endows the alloy with excellent corrosion resistance.