Preparation and characterisation of black conversion coating of Cr(NO3)3–CoCl2–NiCl2 of Zn–Ni alloy electroplated on 2024 aluminium alloy surface

IF 1.6 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials and Corrosion-werkstoffe Und Korrosion Pub Date : 2024-07-19 DOI:10.1002/maco.202414414
Tingyi Chen, Qiming Huang, Hongtao Zhu, Yaqi Ma
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Abstract

To meet the application requirements of electronic connectors, a trivalent chromium process (TCP) conversion coating was prepared on the Zn–Ni alloy plating of 2024 aluminium alloy. The composition of the TCP solution was as follows: 45 g/L Cr(NO3)3, 14 g/L CoCl2, 1.3 g/L NiCl2, 10 g/L citric acid, 10 g/L succinic acid and 1 g/L sodium dodecyl sulphate. The properties of TCP were characterised by a range of techniques, including macroscopic observations, scanning electron microscope, energy-dispersive X-ray spectrometer, three-dimensional (3D) morphometry, electrochemical impedance spectroscopy, polarisation curves and conductivity tests. The TCP prepared in this experiment exhibits a uniform black colour and bright appearance, predominantly composed of Zn, Ni, O, Cr and Co. The TCP enhances the impedance of Zn–Ni alloys, reduces the corrosion current to 1.99 × 10−5 A/cm2 and maintains a flatter surface 3D morphology and less surface roughness following electrochemical testing. It has better corrosion resistance. Following the preparation of the TCP on a suitably sized shell sample, the shell resistance was 1.2 mVDC with good electrical conductivity, which meets the requirements for electrical connector applications.

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在 2024 铝合金表面电镀 Zn-Ni 合金的 Cr(NO3)3-CoCl2-NiCl2 黑色转化镀层的制备与表征
为满足电子连接器的应用要求,在 2024 铝合金的 Zn-Ni 合金电镀层上制备了三价铬工艺(TCP)转换涂层。TCP 溶液的成分如下:45 g/L Cr(NO3)3、14 g/L CoCl2、1.3 g/L NiCl2、10 g/L 柠檬酸、10 g/L 丁二酸和 1 g/L 十二烷基硫酸钠。通过一系列技术对 TCP 的特性进行了表征,包括宏观观察、扫描电子显微镜、能量色散 X 射线光谱仪、三维(3D)形态测量、电化学阻抗光谱、极化曲线和电导率测试。本实验制备的 TCP 呈均匀的黑色,外观明亮,主要成分为 Zn、Ni、O、Cr 和 Co。TCP 可增强 Zn-Ni 合金的阻抗,将腐蚀电流降低到 1.99 × 10-5 A/cm2 ,并在电化学测试后保持较平坦的表面 3D 形貌和较小的表面粗糙度。它具有更好的耐腐蚀性。在适当大小的外壳样品上制备 TCP 后,外壳电阻为 1.2 mVDC,导电性能良好,符合电气连接器应用的要求。
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来源期刊
Materials and Corrosion-werkstoffe Und Korrosion
Materials and Corrosion-werkstoffe Und Korrosion 工程技术-材料科学:综合
CiteScore
3.70
自引率
11.10%
发文量
199
审稿时长
1.4 months
期刊介绍: Materials and Corrosion is the leading European journal in its field, providing rapid and comprehensive coverage of the subject and specifically highlighting the increasing importance of corrosion research and prevention. Several sections exclusive to Materials and Corrosion bring you closer to the current events in the field of corrosion research and add to the impact this journal can make on your work.
期刊最新文献
Calendar of Events Cover Picture: Materials and Corrosion. 11/2024 Masthead: Materials and Corrosion. 11/2024 Contents: Materials and Corrosion. 11/2024 Calendar of Events
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