Effect of Self-assembly Film of PFOA/Silane Coupling Agent on Properties of Epoxy Rust-tolerant Coating Applied on Q235 Carbon Steel

doi:10.11902/1005.4537.2016.214

Journal of Chinese Society for Corrosion and protection

2017, Vol. 37

Issue (6): 554-560 DOI: 10.11902/1005.4537.2016.214

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Effect of Self-assembly Film of PFOA/Silane Coupling Agent on Properties of Epoxy Rust-tolerant Coating Applied on Q235 Carbon Steel

Yinze ZUO, Liang CHEN, Qing FENG, Yanmin GAO(

)

School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China

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Abstract

Mixed solutions of perfluorooctanoic acid (PFOA) with silane coupling agents KH550 and KH560 respectively were used to pre-treat the surface of carbon steel Q235 and then the effect of the two surface treatment agents on the properties of the applied epoxy coatings was studied by means of FT-IR, SEM with EDS, as well as polarization curve measurement, contact angle measurement and dropping corrosion test with CuSO₄ solution. Results show that the performance of the steel treated with PFOA/KH550 and PFOA/KH560 has been improved. Firstly, contact angle increased by 17.2% and 11.7% respectively. Then the time for corrosion occurrence during dropping corrosion test was increased by 64.7% and 38.8% respectively. Finally, corrosion current was reduced by 93.5% and 78.7% respectively. The performance of the epoxy coating applied on the rust steel surface treated with PFOA/KH550 was significantly improved, i.e. the adhesion and impact strength were increased by 14.3% and 11% respect tively, and corrosion current decreased by 96.2% compared with those of the coating applied on the as received rust steel surface. Besides, there was no significant change for the above-mentioned coating after 62 d soaking in NaCI solution.

Key words: KEY WARDS surface treatment silane coupling agent PFOA epoxy coating corrosion

Received: 04 November 2016

ZTFLH:

TG17

Fund: Supported by National Natural Science Fundation of China (51075197), Industry-university-research Cooperation Project in Jiangsu Province (BY2013066-12) and Graduate Innovation Fund of Jiangsu University of Science and Technology (YCX11S-24)

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Yinze ZUO, Liang CHEN, Qing FENG, Yanmin GAO. Effect of Self-assembly Film of PFOA/Silane Coupling Agent on Properties of Epoxy Rust-tolerant Coating Applied on Q235 Carbon Steel. Journal of Chinese Society for Corrosion and protection, 2017, 37(6): 554-560.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2016.214 OR https://www.jcscp.org/EN/Y2017/V37/I6/554

Table 1 Various properties of epoxy coating and corresponding test methods

Fig.1 SEM image (a) and EDS analysis result (b) of the surface of Q235 steel after corrosion

Fig.2 Surface morphologies of the corroded Q235 steel after immersion in PFOA/KH550 (a) and PFOA/KH560 (b) solutions

Fig.3 FT-IR spectra of the surfaces of the corroded Q235 steel after pre-treatment in PFOA/KH550 (a) and PFOA/KH560 (b) solutions

Table 2 EDS analysis results of the surfaces of the corroded Q235 steel after pre-treatment in PFOA/KH550and PFOA/KH560 solutions(atomic fraction / %)

Fig.4 Polarization curves of Q235 steel untreated and treated in PFOA/KH550 and PFOA/KH560 solutions

Table 3 Fitting corrosion parameters of polarization curves

Fig.5 Surface photographs of the epoxy coatings on corroded Q235 steel without treatment (a) and with PFOA/KH550 (b) and PFOA/KH560 (c) treatment

Table 4 Determined properties of the epoxy coatings

Fig.6 Surface images of the coatings on corroded Q235 steel without treatment (a) and with PFOA/KH550 (b) and PFOA/KH560 (c) treatment after immersing in salt solution for 62 d

Fig.7 Polarization curves of the epoxy coatings on corroded Q235 steel without and with PFOA/KH550 and PFOA/KH560 treatments

Table 5 Corrosion parameters obtained from polarization curves of the epoxy coatings

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