Studies of Chemical Adsorption Membrane in the Steel Surface on Application Ze-min Chen 1, Pin Lu 2,a, Zhong-tao Yu 1, Nuan Zhao 1

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1 Advanced Materials Research nline: ISS: , Vol. 704, pp 3-6 doi: / Trans Tech Publications, Switzerland Studies of hemical Adsorption Membrane in the Steel Surface on Application Ze-min hen 1, Pin Lu 2,a, Zhong-tao Yu 1, uan Zhao 1 1 School of hemistry and Material Science, Langfang ormal ollege, Langfang, hina 2 ollege of hemistry and Environmental Science, ebei University, Baoding, hina a lupin421@163.com Keywords: metal surface treatment; chemical adsorption membrane; technology Abstract: In this study we selected polyethylene glycol(400), triethanolamine, silane coupling agent and glycerol as the main raw material, and systematically studied the chemical adsorption film technology on the steel surface by taking one step. Under the optimum conditions( polyethylene glycol(400) was 10mL/L, triethanolamine was 40mL/L, silane coupling agent was 10mL/L, glycerin was 15mL/L, the p was 10, the time was 12min, and temperature was 45 ), we characterized the chemical adsorption film by SEM, XPS and IR. The results showed that the treatment process was simple, the tank liquor was stable, the chemical adsorption film was dense, uniform. This adsorption membrane resistance to corrosion and coating adhesion was superior to the traditional phosphating process. Introduction hemical adsorption film was the molecules adsorbed on the solid base surface of spontaneous to form the ordered molecular film. It played a major role in production of process between the rust and increase the adhesion. In the paint industry, people often use phosphating process on the metal surface pretreatment[1] to enhance the corrosion resistance and coating adhesion. nce the 20th century 30's, the zinc phosphate [2-5] and the iron phosphate had been dominated in this industry.the zinc phosphate film quality was better than iron phosphate film's. It had goog adhesion and anti corrosion for a long time, but its process was complex and easy to produce phosphate sediment, the bath adjustable was narrow and difficult to master and so on. Iron Phosphating had many advantages than zinc phosphate, such as no need to adjust the surface, the process specification was wide, the bath was stability and easy adjustment, can use longer, low sediment, and so on[6]. But its disadvantages were the poor quality of film, small adhesion, short anti-corrosion time, and high cost. After 20 years of development, the chemical adsorption film was one of the hot investigation areas in chemistry and physics, biology, engineering, interface and materials disciplines cross-cutting areas. rganic silane coupling agent adsorbed on the metal surface to form a single monolayer film. This was an effective way to replace the traditional metal surface treatment method. This film had many advantages, such as more orderly, orientation, packing density, low defects and structural stability [7-9], and it was one of the most promising alternative in metal surface pretreatment to replace the phosphate and chromate passivation. This study used one step technology to form chemical adsorption film in the steel surface, and this overcomed the problems which were poor solution stability exist and supine adsorption or absorption in the existing research. All rights reserved. o part of contents of this paper may be reproduced or transmitted in any form or by any means without the written permission of Trans Tech Publications, (ID: , Pennsylvania State University, University Park, USA-09/04/16,00:36:30)

2 Spring International onference on Material Sciences and Technology (MST-S) Experiment Preparation of film-forming agent All used reagents were chemically pure pure chemicals and distilled water were used to prepare all the solutions. Preparation of chemical adsorption film-forming agent: accurately join silane coupling agent 1.0mL, polyethylene glycol (400) 1.0mL, triethanolamine 4.0mL, glycerol 1.5mL in the 200mL beaker, then dissolved in distilled water and set the volume to 100mL, mix well. Specimen processing The carbon steel specimen ( , T12) was totally immersed in degreasing herbicides LS-206 (Sea atlas Langfang hemical o., Ltd.) at room temperature, hang out when the water film uniformity and not linked water after washing. After washing with water the specimen was put into the film-forming agent 12min, when after coating it was removed at room temperature to dry. Results and Discussion IR spectras of chemical coating solution and adsorbed film The Fig.2 showed that the wave numbers of , , , , were the stretching vibration peaks of - and -. Wave numbers in and were the stretching vibration of -. Wave numbers in , , and were the plane bending vibration of -. The wave numbers in and were the stretching vibration of -. Wave numbers in and were the stretching vibration of -, -. Wave numbers in and were the stretching vibration of - straight-chain alkanes. Fig.1 IR of chemical adsorption film Fig.2 IR spectra of liquid coating film By comparing to the Fig.1 and the Fig.2, we can find that the vibration peaks of , , , , were unchanged, while the vibration peaks of , , , , , , , were almost disappeared. The reason may be that the part of the film molecules adsorbed on the surface of the physical combination of iron, then loss of vibration of the original, while only the - vibration of silane coupling agent occurs, when the substrate and the coating solution of iron were reacted.the peaks of and were disappeared. The peaks of left was disappeared, which meaned that the wave numbers becomes larger. According to the formula 1, we can see that the wave number and the square root of bond k e v= 2π µ force constant were directly proportional, that is chemically enhanced.the reason might be the hydroxylation between the oating molecules and the substrate surface of iron, so the - bond

3 Advanced Materials Research Vol with the steel surface formed a --Me bond.the peaks of and intensity became weak, while the position had not changed, which indicated that the -, - had not bonded with the metal. From the above analysis, we can speculate the process of the silane coupling agent and the substrate binding is as follows: Me Me SEM morphology of hemisorbed films Fig.3 SEM of chemisorption film Fig.4 SEM of chemisorption film The filmed specimens were observed by KYKY-2800B scanning electron microscope (SEM), and the SEM morphologys were shown in Fig.3 and Fig.4. We can see from Fig.3 and Fig.4 that the membrane accumulation were close, compact and uniform. XPS analysis of the chemical adsorption film Fig.5 XPS of the chemical adsorption film Analysis all elements energy spectrum in the chemical adsorption film by K-Alpha X-ray photoelectron spectroscopy. From Fig.5 we can see that the chemical adsorbed film contained several elements (eg.,,, a and Fe). This means that the, and elements in the mixed solution had a combination of chemical or physical aspects with the iron atoms in the surface. (1) The spectrum peak of silicon indicated that the silicon atoms involved in the reaction of the chemical adsorbed film. This was consistent with the analysis of IR spectrum conclusions. The silicon atoms and the iron substrate to form Me-- on the steel surface by chemical film.

4 Spring International onference on Material Sciences and Technology (MST-S) (2) The spectrum peaks of carbon and oxygen indicated that these two atoms were involved in the film. This two atoms were contained in every coating solution reagents, so they were bonded with the substrate surface to form the Me--, or adsorpted at the steel surface by physical adsorption. (3) The XPS surface sensitivity was very high, but there had spectrum peak of natrium, which might be because of the pollued by air, water and dust, although the sample surface to maintain a high degree of cleanliness. (4) The two near peaks of iron was same to the single characteristic peak of iron. The left peak of the iron was the Auger peak (LMM) of the iron atoms. Summary The results showed that the process was environmental protection, the operation was simple, and the anti-corrosion ability had been enhanced to some extent. It was suitable for anti-corrosion treatment of steel surfaces. References [1] hun-ming Wang, Metal Phosphating, Electroplating & Pollution ontrol. hina, 20(2000) [2] Wen-jian Meng, olorific Ambiet Temperature Zn-Fe System Phosphating Technology and its Application, Surface technology. hina, 30(2001) [3] De-fang Zeng, Zhi-ming Liu, ai-hua Zhuo, Preparation and Application of Environmental Protecting Type and ne omponent Phosphating Solution at Low Temperature, Surface technology. hina, 30(2001) [4] Lin Tang, Min Zhao, Min Zheng, A Research on Environmen-Friendly ormal Temperature Zn-a Phosphating Solution, Electroplating & Pollution ontrol. hina, 23(2003) [5] Sheng-lin Zhang, ua-hui hen, ong-ling Li, et al, urrent State and Prospect of Ambient Phosphating Technique, Materials protection. hina, 34(2006) [6] hang-shun Zhou, Bao-shu Guan, Lian-chun u, et al, Studies on Iron Phosphating Solution of ormoal Temperature, Surface technology. hina, 29(2000) [7] J. Flis, M. Kanoza, Electrochemical and Surface Analytical Study of Vinyl-triethoxy lane Films on Iron after Exposure to Air, Electrochimica Acta. English, 51(2006) [8] M. Fedel, M.-E. Druart, M. livier, et al, ompatibility between ataphoretic Electro-coating and lane Surface Layer for the orrosion Protection of Galvanized Steel, Progress in rganic oatings. Switzerland, 69(2010) [9] A. Seth, W.J. van oij, P. Puomi, Z. Yin, et al, ovel, ne-step, hromate-free oatings ontaining Anticorrosion Pigments for Metals-An verview and Mechanistic Study, Progress in rganic oatings. Switzerland, 58(2007)

5 2013 Spring International onference on Material Sciences and Technology (MST-S) / Studies of hemical Adsorption Membrane in the Steel Surface on Application /