Al₂O₃浓度对电沉积Ni-Co-Al₂O₃复合镀层耐蚀性能的影响

Effect of Al₂O₃ concentration on the corrosion resistance of electrodeposited Ni-Co-Al₂O₃ composite coatings

摘要

为提高火炮身管耐蚀性能,将柔性摩擦介质辅助的脉冲电沉积工艺应用于氨基磺酸盐镀液体系中,在炮钢(PCrNi3MoVA)表面制备了不同Al₂O₃浓度下的Ni-Co-Al₂O₃复合镀层,并采用扫描电镜(SEM)、能量色散光谱仪(EDS)和X射线衍射仪(XRD)表征了镀层的表面形貌、成分和晶体结构,最后利用CHI760E电化学工作站对复合镀层进行了动电位极化曲线和交流阻抗测试.结果表明:Ni-Co-Al₂O₃复合镀层表面原本为片状形貌,但随着Al₂O₃浓度的增加,逐渐出现针刺状形貌,能够有效减缓腐蚀介质的渗透,进而提升材料的耐蚀性.当Al₂O₃浓度为9g/L时,复合镀层耐蚀性最佳.

Abstract

In order to enhance the corrosion resistance of artillery body tubes, Ni-Co-Al₂O₃ composite coatings with varying Al₂O₃ concentrations were prepared on the surface of gun steel (PCrNi3MoVA) by applying a flexible friction media-assisted pulse electrodeposition process in the sulphamate plating system. The surface morphology, composition and crystal structure of the coating were characterized by scanning electron microscopy (SEM), energy dispersive spectrometer (EDS) and X-ray diffractometer (XRD). Finally, the dynamic potential polarization curves and AC impedance tests were carried out on the composite coatings by using CHI760E electrochemical workstation. The results demonstrate that the surface of the Ni-Co-Al₂O₃ composite coating is initially characterized by a flaky morphology. However, with the increase in the Al₂O₃ concentration, a pin-prick-like morphology gradually emerges, which can effectively slow down the penetration of corrosive media and thereby improve the corrosion resistance of the material. The composite coating exhibits optimal corrosion resistance at a concentration of 9 g/L of Al₂O₃.

关键词

火炮身管延寿 / 柔性摩擦介质 / 脉冲电沉积 / Ni-Co合金镀层 / 耐蚀性

Key words

artillery tube life extension / flexible friction media / pulse electrodeposition / Ni-Co alloy coating / corrosion resistance

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基金资助

辽宁省教育厅基本科研项目(JYTMS202300191)

沈阳理工大学“光选计划”人才资助项目(SYLUGXRC14)