电沉积Ni-Mo和Ni-Mo-P合金的热力学分析

THERMODYNAMIC ANALYSIS OF ELECTRODEPOSITED Ni Mo AND Ni Mo P ALLOYS

利用热力学数据计算并绘制了ＮｉＰＨ２Ｏ系电位—ｐＨ图，根据电位—ｐＨ图分析了电沉积ＮｉＭｏ和ＮｉＭｏＰ合金镀层的电化学行为；利用Ｘ射线衍射测试了ＮｉＭｏ和ＮｉＭｏＰ镀层在镀态下的物相组成。热力学分析表明：Ｍｏ和Ｐ都难以单金属的形式沉积，它们必须和其它金属以诱导共沉积的方式才能沉积出来；Ｐ，Ｎｉ能以金属间化合物Ｎｉ３Ｐ的形式在阴极上沉积；Ｍｏ以两种形式进入阴极，一种为以ＭｏＯ３固体颗粒复合电镀进入镀层，另一种为以金属间化合物的形态沉积。Ｘ射线衍射分析表明，Ｐ以Ｎｉ３Ｐ，Ｍｏ以ＭｏＯ３与ＭｏＣ的形式存在于镀层中，这一结果与热力学分析结论相一致。

The potential pH diagram of Ni P H 2O system was drawn by thermodynamical data, the electrochemical actions of electroplating Ni Mo and Ni Mo P alloys were analyzed. The phases of Ni Mo and Ni Mo P coatings were studied by means of XRD. The results showed that it is difficult to deposit Mo and P as single metal but they can be co deposited by inducing deposition with other metals, P and Ni are deposited in the form of intermetallic compound; Mo is deposited in the cathode by two forms, one is the form of MoO 3 solid particles and the other is the form of intermetallic compound. The XRD analysis is in agree with the thermodynamic analysis.