目的：研究一种钛合金化学转化工艺,增强钛合金表面防护能力及其与涂层的结合能力。方法通过单因素实验确定TC1钛合金氟化物-磷酸盐转化工艺,采用SEM,EDS,XRD分析膜层的微观形貌及成分,同时测试转化膜的有关性能。结果在Na3 PO440 g/L,NaF 15 g/L,酸度调节剂A 25 mL/L,pH控制在4.4~4.6之间,温度30益条件下,可在TC1钛合金表面获得均匀一致的灰色转化膜。转化膜由许多细小的球状晶粒组成,主要相成分为Na3 TiOF5及Na2 TiF6。转化膜的摩擦系数仅为0.3~0.5,明显低于TC1基体。转化膜与TB06-9底漆的干性附着力为0级,浸泡48 h后的湿态附着力仍可达1级,远远好于TC1基体。结论氟化物-磷酸盐转化膜可以降低TC1钛合金的摩擦系数,提高其与有机涂层的附着力。
ABSTRACT:Objective A chemical conversion technique was researched to enhance the protective ability of titanium alloy surface and the adhesion between titanium alloy and organic coating. Methods The preparation technique of fluoride-phosphate conversion coating formed on TC1 alloy was determined by the single-factor experiments. The microstructure and composition of conversion coating were analyzed by SEM, EDS and XRD. Besides, the related properties of the conversion coating were researched. Results A uniform, coherent and gray conversion coating could be obtained on the surface of TC1 alloy when Na3 PO4 , NaF, Acidity Regu-lator A, pH and temperature were 40 g/L, 15 g/L, 25 mL/L, 4. 4~4. 6 and 30 ℃, respectively. The microstructure of the coa-ting showed many small spherical grains. The main phase components were Na3 TiOF5 and Na2 TiF6 . The friction coefficient of the fluoride-phosphate conversion coating was only 0. 3~0. 5, which was significantly lower than that of TC1 alloy. The dry adhesion level between conversion coating and TB06-9 organic coating was 0, and the wet adhesion level after 48 h immersion could still reach 1, both were far better than those of the TC1 alloy substrate. Conclusion Fluoride-phosphate conversion coating could reduce the friction coefficient TC1 titanium alloy, and improve the adhesion between TC1 alloy and organic coating.
参考文献
| [1] | PETERS M;KUMPFERT J;WARD C H;LEYENS C .Titanium Alloys for Aerospace Applications[J].Engineering Material,2003,5(06):419-427. |
| [2] | 李重河,朱明,王宁,鲁雄刚,程申涛.钛合金在飞机上的应用[J].稀有金属,2009(01):84-91. |
| [3] | 李鑫庆;陈迪勤.化学转化膜技术与应用[M].武汉:机械工业出版社,2005 |
| [4] | KULINICH S A;ARHTAR A S .Conversion Coating Treatments to Replace Chromating for Al Alloys:Recent Developments and Possible Future Directions[J].Russian Journal of Non-ferrous Metals,2012,53(02):176-203. |
| [5] | 朱永明,屠振密,李宁,胡会利.钛及钛合金环保型转化膜的应用和发展[J].电镀与环保,2010(03):1-3. |
| [6] | HENKEL A.Non-chrome Conversion Coating[A].,2004 |
| [7] | LOWTHER S E;PARK C;CLAIR T L S .A Novel Surface Treatment for Titanium Alloys[R][R].[s.l.]:NASA Langley Research Center,1999. |
| [8] | MATSUSHIMA Y;TANAKA S;AOKI T .Process for Applying Conversion Coatings on Titanium[P].EP,19880202291,1989-04-19. |
| [9] | United Technologies Corporation .Process for Forming a Halogen- free Trivalent Chromium Conversion Coating[P].EP,2010001020,2010-12-22. |
| [10] | Heath Neuder;Chhiu-Tsu Lin .Chrome-Free Single-Step In-Situ Phosphatizing Coatings on a Ti-6Al-4V Titanium Alloy[J].JCT,2002(930):37-42. |
| [11] | SAE .Conversion Coating of Titanium Alloys in Fluoride-phosphate Type.[ [s. l.]:AMS 2486D][R].,2004. |
| [12] | 李红玲,刘清玲.6061铝合金表面无铬稀土镧转化膜性能的研究[J].表面技术,2013(03):42-45,55. |
| [13] | PALOMINO L E;PASZTI Z .Comparative Investigation of the Adhesion of Ce Convesion Layers and Silane Layers to AA 2024-T3 Substrate Through Mechanical and Electrochemical Test[J].Materials Research,2007,10(04):399-406. |
| [14] | 刘倞,胡吉明,张鉴清,曹楚南.金属表面硅烷化防护处理及其研究现状[J].中国腐蚀与防护学报,2006(01):59-64. |
| [15] | 姚小飞,谢发勤,韩勇,赵国仙,吴向清.温度对TC4钛合金磨损性能和摩擦系数的影响[J].稀有金属材料与工程,2012(08):1463-1466. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%