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Microstructure and Corrosion Behavior of Selective Laser-Melted Al–Ti–Ni Coating on 90/10 Copper–Nickel Alloy
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2022-09-09 , DOI: 10.1002/adem.202200833 Yuhang Gao 1 , Xiaohong Chen 1 , Qingqing Lu 2 , Yubo Liu 1 , Ping Liu 1 , Tao Jiang 1 , Shaoli Fu 1 , Honglei Zhou 1 , Zhen Miao 1 , Jieru Chen 1 , Yupeng Ren 1
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2022-09-09 , DOI: 10.1002/adem.202200833 Yuhang Gao 1 , Xiaohong Chen 1 , Qingqing Lu 2 , Yubo Liu 1 , Ping Liu 1 , Tao Jiang 1 , Shaoli Fu 1 , Honglei Zhou 1 , Zhen Miao 1 , Jieru Chen 1 , Yupeng Ren 1
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Al–Ti–Ni composite coatings with different Ti contents (wt% = 20, 25, 30, 35) are prepared on the surface of 90/10 copper–nickel alloy using selective laser melting. The microstructure and phase composition of the coatings are characterized by scanning electron microscopy, X-ray diffraction, and energy-dispersive spectrometry, and the corrosion resistance of the four coatings and the 90/10 copper–nickel alloy in 3.5 wt% NaCl solution is investigated. The coatings exhibit a good metallurgical bonding with the substrate, and passive films are formed on the surfaces of the coatings after 6 h of potentiostatic polarization. The coating with a Ti content of 30% has the most compact passive film and the best corrosion protection performance due to the minimal Ti2O3 content in the passive film, which greatly improves the stability of the passive film. The immersion corrosion mechanism of the coating is pitting corrosion. Electrochemical tests show that the corrosion current density of all four coatings is one order of magnitude lower than that of the substrate, and the coating with a Ti content of 30% has the lowest corrosion current density, indicating that this coating could significantly improve the corrosion resistance of the substrate.
中文翻译：
90/10 铜镍合金上选择性激光熔化 Al-Ti-Ni 涂层的显微组织和腐蚀行为
采用激光选区熔化技术在 90/10 铜镍合金表面制备不同 Ti 含量（wt% = 20、25、30、35）的 Al-Ti-Ni 复合镀层。通过扫描电子显微镜、X射线衍射和能量色散光谱法对涂层的微观结构和物相组成进行了表征，四种涂层和90/10铜镍合金在3.5 wt% NaCl溶液中的耐腐蚀性能为调查。涂层与基体具有良好的冶金结合，恒电位极化6小时后涂层表面形成钝化膜。Ti含量为30%的镀层由于Ti 2 O 3含量最少，钝化膜最致密，防腐蚀性能最好钝化膜中的含量，大大提高了钝化膜的稳定性。镀层的浸没腐蚀机理为点蚀。电化学测试表明，四种涂层的腐蚀电流密度均比基体低一个数量级，其中Ti含量为30%的涂层腐蚀电流密度最低，说明该涂层能显着改善腐蚀基材的电阻。
更新日期：2022-09-09
中文翻译：
90/10 铜镍合金上选择性激光熔化 Al-Ti-Ni 涂层的显微组织和腐蚀行为
采用激光选区熔化技术在 90/10 铜镍合金表面制备不同 Ti 含量（wt% = 20、25、30、35）的 Al-Ti-Ni 复合镀层。通过扫描电子显微镜、X射线衍射和能量色散光谱法对涂层的微观结构和物相组成进行了表征，四种涂层和90/10铜镍合金在3.5 wt% NaCl溶液中的耐腐蚀性能为调查。涂层与基体具有良好的冶金结合，恒电位极化6小时后涂层表面形成钝化膜。Ti含量为30%的镀层由于Ti 2 O 3含量最少，钝化膜最致密，防腐蚀性能最好钝化膜中的含量，大大提高了钝化膜的稳定性。镀层的浸没腐蚀机理为点蚀。电化学测试表明，四种涂层的腐蚀电流密度均比基体低一个数量级，其中Ti含量为30%的涂层腐蚀电流密度最低，说明该涂层能显着改善腐蚀基材的电阻。
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