电镀电流密度对铝锰合金镀层耐蚀性的影响

发布时间：2018-04-26 20:49

本文选题：Al-Mn合金 + 熔盐电镀　；参考：《表面技术》2017年12期

【摘要】：目的提高钢铁材料的耐腐蚀性能。方法采用添加了质量分数1.0%MnCl2作为锰源的Al Cl3-NaCl-KCl熔盐体系,在电流密度分别为13.3、26.7、48.0、50.0、55.6 m A/cm~2的条件下在Q235钢表面进行电镀,测试了该熔盐体系中电镀过程的循环伏安曲线。采用X射线衍射仪(XRD)、电子能谱仪(EDS)与扫描电子显微镜(SEM)对镀层表面与横剖面进行检测,并在1.0 mol/L NaCl溶液中,用电化学工作站对镀层进行了动电位极化曲线测试。结果电镀过程中Al与Mn存在共沉积现象,不同电镀电流密度条件下得到的Al-Mn合金镀层均为非晶态,镀层的剖面分析表明镀层均匀、界线清晰,成分为Al与Mn两种金属。电流密度较小时镀层平整光滑,达到48.0 m A/cm~2时,镀层中开始有胞状物质形成,且随电流密度的增大变得显著。平衡电位、线性极化电阻与腐蚀电流密度均随电镀电流密度先增大后减小,并且在电流密度为48.0m A/cm~2时达到最小腐蚀电流密度与最大线性极化电阻。结论 Al-Mn合金镀层为非晶态,电镀电流密度为48.0 m A/cm~2得到的镀层在1.0 mol/L NaCl溶液中具有较好的耐腐蚀性。
[Abstract]:Objective to improve the corrosion resistance of iron and steel materials. Methods Al Cl3-NaCl-KCl molten salt system with mass fraction of 1.0%MnCl2 as manganese source was used for electroplating on the surface of Q235 steel under the condition of current density of 13. 3 ~ 26. 7% 48.0 ~ 50. 0 ~ 55.6m A/cm~2, respectively. The cyclic voltammetry curves of the electroplating process in the molten salt system were measured. The surface and cross section of the coating were measured by X-ray diffractometer (XRD), electron energy spectrometer (EDS) and scanning electron microscope (SEM). The electrochemistry workstation was used to measure the dynamic potential polarization curve of the coating in 1. 0 mol/L NaCl solution. Results there was codeposition of Al and mn in the electroplating process. The Al-Mn alloy coatings obtained under different electroplating current density were amorphous. The profile analysis showed that the coating was uniform, the boundary was clear, and the composition was Al and mn. When the current density is small, the coating is smooth and smooth, reaching 48.0 Ma / cm ~ 2, and the cellular substance begins to form in the coating, and becomes obvious with the increase of the current density. The equilibrium potential, linear polarization resistance and corrosion current density increase first and then decrease with the current density of electroplating, and reach the minimum corrosion current density and the maximum linear polarization resistance when the current density is 48.0 Ma / cm ~ 2. Conclusion the Al-Mn alloy coating is amorphous and the electroplating current density is 48.0 m A/cm~2. The coating has good corrosion resistance in 1.0 mol/L NaCl solution.
【作者单位】：吕梁学院化学化工系;
【基金】：山西省高等学校大学生创新创业训练计划项目(晋教高2017 3号)~~
【分类号】：TQ153

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