Li Qiong,Xu Xueyuan,Wang Chunxia*.Effect of pH on properties of cadmium titanium alloy electroplated without cyanide Li Xuyong1, Chen Wei1, Zhang Dongsheng1, Wu Qunying1,[J].Plating & Finishing,2025,(01):15-22.
doi: 10.3969/j.issn.1001-3849.2025.01.003 pH对无氰电镀镉钛合金性能的影响
- Title:
- Effect of pH on properties of cadmium titanium alloy electroplated without cyanide Li Xuyong1, Chen Wei1, Zhang Dongsheng1, Wu Qunying1,
- Keywords:
- pH; Cd-Ti alloy; stability; corrosion resistance; hydrogen embrittlement
- 分类号:
- TQ153.2
- 文献标志码:
- A
- 摘要:
- 无氰电镀镉钛工艺被广泛用于航空产业，但仍然存在镀液不稳定的技术难题，其中镀液的pH值是一个关键影响因素。为探究pH值的影响，采用静置试验，透过率测试、Zeta电位表征等方法研究了镀液的稳定性，通过场发射电子显微镜以及X射线衍射仪对镀层的微观结构进行了分析，采用模拟海水浸泡实验测试了镀层的耐蚀性，并通过渗氢曲线和钛含量测试分析了镀层的氢脆性能。结果表明：镀液pH值是影响镀液稳定性的主要因素。当镀液pH为6.5～6.8时，镀液透过率在100%左右，镀液的Zeta电位较高，稳定性最好；当镀液pH值大于6.8时，镀液稳定性急剧下降。当镀液pH为6.5～6.8时，镀层表面细致，晶粒尺寸较小，镀层的耐蚀性最好，镀层钛含量较高，抗渗氢能力较强。
- Abstract:
- The cyanide-free cadmium-titanium plating process is now widely used in the aviation industry, but there are still technical challenges of unstable plating solution, in which the pH value of the bath is a key influencing factor. In order to explore the influence of pH value, the stability of the coating solution was studied by static test, transmittance test and Zeta potential characterization, the microstructure of the coatings was analyzed by field emission electron microscopy and X-ray diffractometer, the corrosion resistance of the coating was tested by simulated seawater immersion experiment, and the hydrogen embrittlement properties of the coating were analyzed by hydrogen permeation curve and titanium content test. The results show that the pH value of the plating solution is the main factor affecting the stability of the bath, when the pH of the bath is 6.5~6.8, the transmittance of the bath is about 100%, the Zeta potential of the bath is high, and the stability of the bath is the best, and when the pH value of the bath is greater than 6.8, the stability of the bath decreases sharply. When the pH of the bath is 6.5~6.8, the surface of the plating layer is fine, and the grain size is small, the corrosion resistance of the coating are the best, the titanium content of the coating is high, and the resistance to hydrogen permeability is strong.
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