Zhang Zhiying, Zhong Xinwei, Teng Xiujin, Huang Yanshu, Han Han, Chen Tao, Zhang Qinyi, Yang Xiao, Gong Yanlong
School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China.
Yang Jiang Alloy Laboratory, Yangjiang 529568, China.
Materials (Basel). 2023 Apr 26;16(9):3389. doi: 10.3390/ma16093389.
The electrochemical properties of as-cast ZrCuNiAlNb metallic glass and samples annealed at different temperatures were investigated using potentiodynamic polarization tests and electrochemical impedance spectroscopy (EIS) in phosphate buffer saline (PBS) solution. It was shown that passivation occurred for the as-cast sample and the samples annealed at 623-823 K, indicating good corrosion resistance. At higher annealing temperature, the corrosion resistance first increased, and then decreased. The sample annealed at 823 K exhibited the best corrosion resistance, with high spontaneous corrosion potential E at -0.045 V, small corrosion current density i at 1.549 × 10 A·cm, high pitting potential E at 0.165 V, the largest arc radius, and the largest sum of R and R at 5909 Ω·cm. For the sample annealed at 923 K, passivation did not occur, with low E at -0.075 V, large i at 1.879 × 10 A·cm, the smallest arc radius, and the smallest sum of R and R at 2173 Ω·cm, which suggested the worst corrosion resistance. Proper annealing temperature led to improved corrosion resistance due to structural relaxation and better stability of the passivation film, however, if the annealing temperature was too high, the corrosion resistance deteriorated due to the chemical inhomogeneity between the crystals and the amorphous matrix. Optical microscopy and scanning electron microscopy (SEM) examinations indicated that localized corrosion occurred. Results of energy dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS) illustrated that the main corrosion products were ZrO, CuO, CuO, Ni(OH), AlO, and NbO.
采用动电位极化试验和电化学阻抗谱（EIS），在磷酸盐缓冲盐水（PBS）溶液中研究了铸态ZrCuNiAlNb金属玻璃及不同温度退火样品的电化学性能。结果表明，铸态样品以及在623 - 823 K退火的样品发生了钝化，表明具有良好的耐腐蚀性。在较高退火温度下，耐腐蚀性先增加后降低。在823 K退火的样品表现出最佳的耐腐蚀性，其自腐蚀电位E较高，为 - 0.045 V，腐蚀电流密度i较小，为1.549×10 A·cm，点蚀电位E较高，为0.165 V，弧半径最大，R和R之和最大，为5909 Ω·cm。对于在923 K退火的样品，未发生钝化，E较低，为 - 0.075 V，i较大，为1.879×10 A·cm，弧半径最小，R和R之和最小，为2173 Ω·cm，这表明其耐腐蚀性最差。适当的退火温度由于结构弛豫和钝化膜更好的稳定性而导致耐腐蚀性提高，然而，如果退火温度过高，由于晶体与非晶基体之间的化学不均匀性，耐腐蚀性会恶化。光学显微镜和扫描电子显微镜（SEM）检查表明发生了局部腐蚀。能量色散X射线光谱（EDS）和X射线光电子能谱（XPS）结果表明，主要腐蚀产物为ZrO、CuO、CuO、Ni(OH)、AlO和NbO。
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