Properties of Organic/Inorganic Hybrid Coatings Formed on Magnesium Alloy Surface

doi:10.11901/1005.3093.2016.240

Chinese Journal of Materials Research

2017, Vol. 31

Issue (3): 211-218 DOI: 10.11901/1005.3093.2016.240

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Properties of Organic/Inorganic Hybrid Coatings Formed on Magnesium Alloy Surface

Zhengyuan GAO^1,³(

),Xianlong CAO²,Lang LIU⁴,Yiliu FANG¹,Linsheng HU¹

1 School of Mechatronics and Automotive Engineering, Chongqing Jiaotong University, Chongqing 400074, China
2 School of Metallurgy and Materials Engineering, Chongqing University of Science and Technology, Chongqing 401331, China
3 Chongqing Academy of Metrology and Quality Inspection, Chongqing, 401121, China
4 School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China

Cite this article:

Zhengyuan GAO,Xianlong CAO,Lang LIU,Yiliu FANG,Linsheng HU. Properties of Organic/Inorganic Hybrid Coatings Formed on Magnesium Alloy Surface. Chinese Journal of Materials Research, 2017, 31(3): 211-218.

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Abstract

Organic/inorganic hybrid coatings were prepared on AZ31 magnesium alloy, which then was characterized by means of scanning electron microscope, scanning probe microscope, electrochemical analyzer, optical microscope and coatings thickness tester in terms of surface morphology, corrosion resistance, adhesion and thickness. While the influence of pH value of organic/inorganic hybrid sol-gel on the properties of organic/inorganic hybrid coating was also investigated. The results show that pH values of organic/inorganic hybrid sol-gel have important effect on the properties of the organic/inorganic hybrid coatings formed on AZ31 magnesium alloy: When pH value is in the range 3~3.5, a smooth and few defects hybrid coating of the thickness of 22 μm can be obtained; When pH value is in the range 2.2~2.8, the hybrid coating became thin and coarse with some big pores; When pH value equals to 3.0, the hybrid coating has good adhesion, highest corrosion potential and minimum corrosion current density (~7.34×10^-5 A/cm²). Corrosion inhibition efficiency of the hybrid coating prepared by sol-gel with pH 3.0 could reach ~ 99.7% compared to the blank AZ31 magnesium alloy.

Key words: materials failure and protection magnesium alloys pH value sol-gel method corrosion resistance

Received: 03 May 2016

Fund: Supported by Scientific and Technological Research Program of Chongqing Municipal Bureau of Quality and Technical Supervision (Nos.CQZJKY2013001 & CQZJKY2014017);Scientific and Technological Research Program of General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China (No.2014QK263);Scientific and Technological Research Program of Nanchuan in Chongqing (No.CX201407);Chongqing Innovation Project of Key Industrial Generic Technology(cstc2016zdcy50002);Chongqing Research Program of Basic Research and Frontier Technology (Nos.CSTC2015JCYJBX0140 & CSTC2015JCYJA50003);Scientific and Technological Research Program of Chongqing Municipal Education Commission (Nos.KJ1401314 & KJ1401310)

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	Zhengyuan GAO
	Xianlong CAO
	Lang LIU
	Yiliu FANG
	Linsheng HU

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.240 OR https://www.cjmr.org/EN/Y2017/V31/I3/211

Fig.1 Experimental plan

Table 1 Composition and pH value of hybrid Sol system with different glacial acetic acid content

Fig.2 SEM image of hybrid coatings prepared at different pH value on AZ31 Mg alloy

Fig.3 SEM Image of hybrid coating prepared at pH=2.2 on AZ31 Mg alloy

Table 2 Thickness of hybrid coatings prepared at different pH value on AZ31 Mg alloy

Fig.4 OM image of scratch on hybrid coatings prepared on surface of AZ31 Mg alloy for different pH value

Fig.5 Polarization curves of hybrid coating prepared at different pH on AZ31 Mg alloy

Table 3 Electrochemical parameters from polarization curves and corrosion inhibition efficiency of hybrid coatings prepared at different pH value

Table 4 Open circuit potential of hybrid coatings prepared at different pH value on AZ31 Mg alloy

Fig.6 Open circuit potential-time curves of hybrid coatings prepared at different pH value on AZ31 Mg alloy

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