赵丹,杨立根,徐旭仲.低碳钢表面化学镀 Ni-Zn-P 合金镀层的沉积行为及沉积机理[J].表面技术,2016,45(1):69-74,95.
ZHAO Dan,YANG Li-gen,XU Xu-zhong.Deposition Behavior and Mechanism of Electroless Plating Ni-Zn-P Alloy Coating on Low-carbon Steel Surface[J].Surface Technology,2016,45(1):69-74,95 |
| 低碳钢表面化学镀 Ni-Zn-P 合金镀层的沉积行为及沉积机理 |
| Deposition Behavior and Mechanism of Electroless Plating Ni-Zn-P Alloy Coating on Low-carbon Steel Surface |
| 投稿时间：2015-09-17 修订日期：2016-01-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2016.01.011 |
| 中文关键词: 低碳钢 碱性化学镀 Ni-Zn-P 合金镀层 组织形貌 镀层成分 沉积机理 |
| 英文关键词:low-carbon steel alkaline electroless plating Ni-Zn-P alloy coating microstructure morphology coating composition deposition mechanism |
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| 目的 通过研究低碳钢表面碱性化学镀 Ni-Zn-P 合金镀层的沉积行为及其沉积机理,对化学镀Ni-Zn-P 有进一步认识。 方法 采用碱性化学镀方法,改变施镀时间在低碳钢表面化学镀 Ni-Zn-P 合金镀层。 使用扫描电镜?旌辖鸲撇愕谋砻婧投厦嫘蚊?用电子能谱仪分析镀层表面和断面成分。 结果化学镀 Ni-Zn-P 合金镀层的形成过程是:固液界面形成原子团→原子团在能量较高的地方择优沉积→原子团累积生长→向周围延伸扩展→覆盖整个机体→形成完整镀层→均匀叠加生长。 试样表面成分检测表明,施镀 1 ~3 s 内表面出现 Ni 元素,Ni 质量分数在 3 min 时达到最大值 75. 93% ,此后维持相对稳定;施镀1 min 时表面出现 P,P 质量分数随施镀时间延长而逐渐增加,在30 min 时达到最大值12. 03% ,此后维持相对稳定;施镀 5 min 时表面出现 Zn,随着施镀时间的延长,Zn 沉积量变化不大。 表面和断面成分分析表明,化学镀 Ni-Zn-P 合金镀层的沉积过程不是 Ni,Zn,P 三种元素同时沉积,而是 Ni 优先沉积,然后Ni 和 P 共沉积,最后 Ni,Zn,P 三种元素共同沉积。 根据能斯特方程算得沉积电位 ENi2+/ Ni = -0. 337 V,EZn2+/ Zn = -0. 906 V,两者的沉积电位相差较大,说明该化学镀条件下不能发生合金共沉积。 结论 推测化学镀 Ni-Zn-P 合金镀层是催化诱导还原反应沉积机理,即在镍还原诱导下引发的 Zn 共沉积。 |
| 英文摘要: |
| Objective To further understand chemical plating Ni-Zn-P by studying on deposition behavior and mechanism of alkaline electroless plating Ni-Zn-P alloy coating on low-carbon steel surface. Methods The Ni-Zn-P alloy coatings were prepared on Q235 steel by alkaline electroless plating technique and changing the application time. The morphology of coating surface and cross section was observed by SEM, and the composition of coating surface and cross section was analyzed by EDS. Results The deposition process of Ni-Zn-P alloy coating was that the atomic group formed on solid liquid interface → preferential deposition of atomic group on regions with higher energy → atomic group accumulation → extending to the surrounding → covering the entire matrix → forming complete coating → uniform growth. The surface composition detection results of Ni-Zn-P alloy coating were obtained. Firstly, the element Ni was detected in after plating for 1 ~ 3 s and the maximum amount 75. 93wt% occurred on the surface within 3 min, since then it was maintained stable. Secondly, the element P was detected after plating for 1 min, and then the P percentage gradually increased with prolonging plating time, and the maximum amount 12. 03wt% was reached at 30 min, after that it was maintained stable. Finally, Zn was detected at 5 min and the deposition amount was 4. 18 wt% on the surface, since then there was little change in deposition amount. The results of component analysis showed that the deposition process of Ni-Zn-P alloy coating was preferential deposition of Ni, followed by co-deposition of Ni and P, and finally co-deposition of Ni, P and Zn to form a continuous and dense coating. Based on Nernst equation, ENi2+ / Ni = -0. 337 V and EZn2+ / Zn = -0. 906 V. The alloy co-deposition electroless plating could not occur due to the big difference between the two deposition potentials. Conclusion The deposition mechanism of Ni-Zn-P alloy coating was believed to be catalytic reduction reaction, namely Zn co-deposition induced by nickel reduction. |
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