Effect of Ti Addition on Microstructure and Corrosion Property of Zn-5Al Alloy

doi:10.11902/1005.4537.2013.206

Journal of Chinese Society for Corrosion and protection

2014, Vol. 34

Issue (6): 515-522 DOI: 10.11902/1005.4537.2013.206

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Effect of Ti Addition on Microstructure and Corrosion Property of Zn-5Al Alloy

LIU Zili(

), LIU Xiqin, WANG Huaitao, HU Jindong, HOU Zhiguo

College of Materials Science and Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

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Abstract

The microstructure and corrosion properties of Zn-5Al-xTi alloy have been investigated by OM, SEM, EDS and electrochemical tests etc. The results show that a small amount of Ti addition in Zn-5Al alloy refines the primary β-Zn phase and increases the percentage of the eutectic structure. With the addition of 0.15%Ti, almost all β-Zn phase disappears in the Zn-5Al-0.15Ti alloy and therewith which exhibits an entire eutectic microstructure. With increasing the Ti content to 0.2%, a new Al-Ti-Zn ternary phase appears in the alloy. The addition of Ti increases the corrosion resistance of Zn-5Al alloy. Among others, the corrosion rate and corrosion current density of Zn-5Al-0.15Ti alloy reach a minimum of 0.85 μgcm^-²d^-¹ and 1.403 μA/cm² respectively, while the impedance at high frequency or the diffusion impedance at low frequency all reach a maximum. Uniform corrosion occurs for the Zn-5Al-0.15Ti alloy with entire eutectic microstructure.

Key words: Ti Zn-5Al alloy corrosion property

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Cite this article:

LIU Zili, LIU Xiqin, WANG Huaitao, HU Jindong, HOU Zhiguo. Effect of Ti Addition on Microstructure and Corrosion Property of Zn-5Al Alloy. Journal of Chinese Society for Corrosion and protection, 2014, 34(6): 515-522.

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https://www.jcscp.org/EN/10.11902/1005.4537.2013.206 OR https://www.jcscp.org/EN/Y2014/V34/I6/515

Table 1 Nominal compositions of Zn-Al alloys

Fig.1 Metallographic structures of Zn-5Al (a), Zn-5Al-0.1Ti (b), Zn-5Al-0.15Ti (c) and Zn-5Al-0.2Ti (d) alloys

Fig.2 SEM image (a) and EDS results (b) of Zn-5Al-0.2Ti alloy

Fig.3 Corrosion rates of Zn-5Al-xTi alloys

Fig.4 Variations of the corrosion potential E_corr as a function of exposure time for Zn-5Al-xTi alloys in 3.5%NaCl solution

Fig.5 Polarization curves of Zn-5Al-xTi alloys in 3.5% NaCl solution

Table 2 Values of I_corr, b_a and b_c, deduced from polarization measurements

Fig.6 Representative Nyquist diagrams of Zn-5Al (a), Zn-5Al-0.1Ti (b), Zn-5Al-0.15Ti (c) and Zn-5Al-0.2Ti (d) alloys after exposure in 3.5%NaCl solution for different time

Fig.7 Variations of R_H as a function of time for Zn-5Al-xTi alloys during immersion in 3.5%NaCl solution

Fig.8 Variations of Y₀ as a function of exposure time for Zn-5Al-xTi alloys during immersion in 3.5%NaCl solution

Fig.9 Corrosion morphologies of Zn-5Al alloy immersed in 3.5%NaCl solution for 120 h (a), 240 h (b), 360 h (c) and Zn-5Al-0.15Ti alloy for 120 h (d), 240 h (e), 360 h (f)

Fig.10 SEM images of Zn-5Al (a), Zn-5Al-0.1Ti (b), Zn-5Al-0.15Ti (c) and Zn-5Al-0.2Ti (d) alloys after exposure in 3.5%NaCl solution for 480 h

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