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TC4 Titanium Alloy in the
Na3PO4-NaF-CH3COOH Solution Conversion
Coating Preparation and Its Performance
Study
Yuansheng Lv, Tingyi Chen*, Xinming Li
Key Laboratory of Inorganic Nonmetal Functional Material, School of Materials and Construction,
Guizhou Normal University, Guiyang
Email: *tingyi.chen@gznu.edu.cn
Received: Jan. 6th, 2014; revised: Feb. 10th, 2014; accepted: Feb. 23rd, 2014
Copyright © 2014 by authors and Hans Publishers Inc.
This work is licensed under the Creative Commons Attribution International License (CC BY).
https://creativecommons.org/licenses/by/4.0/
Abstract
Using the solution system of Na3PO4-NaF-CH3COOH to conduct conversion coating surface treatment
on TC4 titanium alloy, we analyze the surface shape and composition of conversion film by
using SEM, EDS, XRD. Results show that the conversion film is mainly composed by Na3tiF6 phase,
TiO2 titanium phase and the matrix. The main reason for weight gain is the process of film crystallization.
In Na3PO4-NaF-CH3COOH solution system, we study the effect of translative temperature
and time on the pickling and unpickling treatments of TC4 titanium alloy. We find that in the condition
of 25˚C and 10 min, the process of titanium alloy film is best; and that the colour is light gray
while the fabrication of the conversion film is a process of corrosion and growth. Comparing the
coating adhesion force of the TC4 titanium alloy before and after filming, we find that the sample
surface coating adhesion was greatly improved after fluoride phosphate mixed solution treatment.
Keywords
Titanium Alloy Surface; Na3PO4-NaF-CH3COOH Solution System; Adhesion Performance
TC4îѺϽðÔÚNa3PO4-NaF-CH3COOH
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Email: *tingyi.chen@gznu.edu.cn
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(a) (b)
Figure 1. Untreated titanium alloy and after dealing with
the Na3PO4-NaF-CH3COOH solution system of topography
ͼ 1. δ´¦ÀíµÄîѺϽðºÍ¾­¹ý Na3PO4-NaF-CH3COOH ÈÜ
ÒºÌåϵ´¦ÀíºóµÄÐÎòͼ
(a) (b)
Figure 2. SEM images of untreated titanium alloy and after dealing
with the Na3PO4-NaF-CH3COOH solution system
ͼ 2. δ´¦ÀíµÄîѺϽðºÍ¾­¹ý Na3PO4-NaF-CH3COOH ÈÜÒºÌåϵ
´¦ÀíºóµÄSEM ͼÏñ
Figure 3. EDS spectra of titanium alloy after dealing with the Na3PO4-NaFCH3COOH
system of surface
ͼ 3. îѺϽ𾭹ý Na3PO4-NaF-CH3COOH Ìåϵ´¦ÀíºóµÄ±íÃæEDS Æ×ͼ
3.4. ת»¯Ä¤ÎïÏà·ÖÎö
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Table 1. Element weight and atomic percentage
±í 1. ÔªËØÖØÁ¿¼°Ô­×Ó°Ù·Ö±È
ÔªËØ ÖØÁ¿ Ô­×Ó
°Ù·Ö±È °Ù·Ö±È
O K 4.72 7.07
F K 48.78 61.56
Na K 14.72 15.35
P K 0.43 0.33
Ti K 31.35 15.69
×ÜÁ¿ 100.00
20 40 60 80 100
0
3000
6000
9000
12000
15000
18000
P
P F FF
P
Ti
Ti
Ti
Ïà¶ÔÇ¿¶È
2¦È£¨¡ã£©
Figure 4. XRD spectra of titanium alloy after dealing with the Na3PO4-NaF-CH3COOH solution
on the surface
ͼ 4. îѺϽ𾭹ý Na3PO4-NaF-CH3COOH ÈÜÒºÌåϵ´¦Àíºó±íÃæµÄXRD Æ×ͼ
ÖØµÄÓ°Ïì¡£
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Ï´´¦ÀíµÄîѺϽðÔöÖØÐ§¹û½ÏΪÃ÷ÏÔ£»ÔÚ10~20 ʱ¼ä¶Î£¬îѺϽð³ÉĤЧ¹û¶¼³Ê½µµÍµÄÇ÷ÊÆ£¬ÔÚ25~30 min ʱ
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Figure 5. titanium alloy and conversion coating weight contrast figure in the Na3PO4-NaFCH3COOH
solution
ͼ 5. îѺϽðÔÚNa3PO4-NaF-CH3COOH ÈÜÒºÏÂת»¯Ä¤ËæÊ±¼äµÄÔöÖØ
Figure 6. The titanium alloy and conversion coating weight increased with the temperature in the
Na3PO4-NaF-CH3COOH solution system
ͼ 6. îѺϽðÔÚ Na3PO4-NaF-CH3COOH ÈÜÒºÌåϵÏÂת»¯Ä¤ËæÎ¶ÈÔöÖØ
3.7. îѺϽðÑùÆ·µÄÍ¿²ã¸½×ÅÁ¦ÐÔÄÜ
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²Î¿¼ÎÄÏ×(References)
[1] ÃÏÇìÀ¼, ¹ØÊçÃô, ÀîÖÐ (2011) ÊÀ½çº½¿ÕîÑÊг¡ÏÖ×´¼°·¢Õ¹Ç÷ÊÆ. îѹ¤Òµ½øÕ¹, 2, 1-3.
[2] ¹ùÖÜÇ¿, ¸ðÀûÁá, Ô¬º½µÈ(2012) îѺϽðTC4 ±íÃæÄÉÃ×»¯¼°ÆäÈÈÎȶ¨ÐÔ. ²ÄÁÏÈÈ´¦Àíѧ±¨, 3, 114-118.
[3] »ÆÐñ (2012) º½¿ÕÓÃîѺϽð·¢Õ¹¸ÅÊö. ¾üÃñÁ½Óü¼ÊõÓë²úÆ·, 7, 12-14.
[4] Cui, C., Hu, B.M., Zhao, L., et al. (2011) Titanium Alloy Production Technology, Market Prospects and Industry Development.
Materials & Design, 3, 1684-1691.
[5] ÑîÓ¢Àö, ËÕº½±ê, ¹ùݶ×ÓµÈ(2010) ÎÒ¹ú½¢´¬îѺϽðµÄÑо¿½øÕ¹. ÖйúÓÐÉ«½ðÊôѧ±¨, 1, s1002-s1007.
[6] ÓÚÕñÌÎ, ÕÅÃ÷»ª, ÓàÉ­µÈ(2012) ÖйúÒ½ÁÆÆ÷еÓÃîѺϽð²ÄÁÏÑз¢£¬Éú²úÓëÓ¦ÓÃÏÖ×´·ÖÎö. ÖйúÒ½ÁÆÆ÷еÐÅÏ¢, 7, 1-8.
[7] Íõ»ÀÇÙ (2001) îѼ°îѺϽ𺸽ӽÓÍ·µÄ×éÖ¯£¬ÐÔÄܺͶÏÁÑÌØÐÔ. º¸½Ó, 11, 27.
[8] Miracle, D.B., Tamirisakandala, S., Bhat, R.B., et al. (2012) Titanium Alloy Microstructural Refinement Method and
High Temperature, High Strain Rate Superplastic Forming of Titanium Alloys. US Patent, 8, 128,764[P].
[9] ½ªº£ÌÎ, ÉÛÖÒ²Æ, ÎºÊØÇ¿ (2010) îѺϽð±íÃæ´¦Àí¼¼ÊõµÄÑо¿½øÕ¹. µç¶ÆÓ뾫ÊÎ, 10, 15-20.
[10] ÍÀÕñÃÜ, ÖìÓÀÃ÷, ÀîÄþµÈ(2010) îѼ°îѺϽð±íÃæ½ðÊôµç³Á»ýµÄÔ¤´¦ÀíÎÊÌâ. Öйú±íÃæ¹¤³Ì, 1, 24-29.
[11] Zhang, K.M., Zou, J.X., Li, J., et al. (2010) Surface Modification of TC4 Ti Alloy by Laser Cladding with TiC + Ti
Powders. Transactions of Nonferrous Metals Society of China, 11, 2192-2197.
[12] ö¤ÚS, °²³ÉÇ¿, ºÂ½¨¾ü (2010) ÂÁºÏ½ðÎÞ¸õ»¯Ñ§Ñõ»¯¹¤ÒÕµÄÑо¿½øÕ¹. µç¶ÆÓ뾫ÊÎ, 6, 26-30.
[13] Michiardi, A., H¨¦lary, G., Nguyen, P.C.T., et al. (2010) Bioactive Polymer Grafting onto Titanium Alloy Surfaces.
Acta Biomaterialia, 2, 667-675.
[14] Íõ¶«Éú, Ìï×Ú¾ü, ÉòÀí´ï, ÁõÖ¾¶«, »ÆÒò»Û(1698) ¼¤¹â±íÃæÈÛ¸²ÖƱ¸ÄÉÃ׽ṹͿ²ãµÄÑо¿½øÕ¹. Öйú¼¤¹â, 11,
1698-1709.

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