铝合金钛锆转化膜槽液消耗规律的研究

发布时间：2018-11-15 07:03

【摘要】：目的在前期研制的新型铝合金表面钛锆转化膜工艺配方的基础上,进一步探索该新型工艺配方在连续使用过程中的消耗规律。方法通过在连续使用过程中对转化液中主要金属离子(钛、锆、M等)的含量测定分析,找出该成膜剂的消耗规律。采用电化学工作站和SEM对槽液连续使用过程中膜层的耐蚀性能及微观形貌进行表征。结果转化液中的主要成膜成分钛、锆、M的消耗质量比例基本不变,为5:1:4。XPS分析显示,膜层主要由金属氧化物(TiO_2、ZrO_2、Al_2O_3、M_2O_5)、金属氟化物(ZrF_4、AlF_3)和金属有机络合物等组成。随着成膜的不断进行,膜层的耐蚀性能有所下降,自腐蚀电流密度由最初成膜时的0.11μA/cm~2增加到1.24μA/cm~2,但仍低于铝合金基体的自腐蚀电流密度(7.53μA/cm~2)。随着连续成膜,膜层表面的微观裂纹不断变宽,在连续成膜到第80片时,铝合金表面有的位置已经不能成膜。结论钛锆转化液在连续使用过程中,转化液中的主要成膜成分按一定比例消耗,膜层的耐蚀性能随着连续成膜有所下降,因此有必要及时对转化液进行补加和校正。
[Abstract]:Aim to explore the consumption rule of the new titanium zirconium conversion film on the surface of aluminum alloy. Methods through the determination and analysis of the main metal ions (titanium, zirconium, M, etc.) in the conversion solution during the continuous use, the consumption rule of the film forming agent was found out. Electrochemical workstation and SEM were used to characterize the corrosion resistance and micromorphology of the film during the continuous use of the bath solution. Results the consumption mass ratio of titanium, zirconium and M in the conversion solution was almost unchanged. The 5:1:4.XPS analysis showed that the film was mainly composed of metal oxide (TiO_2,ZrO_2,Al_2O_3,M_2O_5). Metal fluoride (ZrF_4,AlF_3) and organometallic complexes. The corrosion resistance of the film decreased with the continuous development of the film. The self-corrosion current density increased from 0.11 渭 A/cm~2 to 1.24 渭 A / cm ~ (-2), but it was still lower than that of aluminum alloy substrate (7.53 渭 A/cm~2). With the continuous film formation, the microcracks on the film surface become wider and wider. When the film is continuously formed to the 80th film, the aluminum alloy surface can no longer form the film. Conclusion in the process of continuous use of titanium zirconium conversion solution, the main film-forming components are consumed in a certain proportion, and the corrosion resistance of the film decreases with the continuous film formation. Therefore, it is necessary to add and correct the conversion solution in time.
【作者单位】：华南理工大学材料科学与工程学院;
【基金】：广东省重大科技专项(产业共性技术)(2009A08025002)~~
【分类号】：TG174.4

【相似文献】