Performance of Al-Zn-In-Mg-Ti Sacrificial Anode in Simulated Low Dissolved Oxygen Deep Water Environment

doi:10.11902/1005.4537.2019.180

Journal of Chinese Society for Corrosion and protection

2020, Vol. 40

Issue (6): 508-516 DOI: 10.11902/1005.4537.2019.180

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Performance of Al-Zn-In-Mg-Ti Sacrificial Anode in Simulated Low Dissolved Oxygen Deep Water Environment

SUN Haijing(

), QIN Ming, LI Lin

School of Environmental and Chemical Engineering, Shenyang Ligong University, Shenyang 110159, China

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Abstract

The performance of the Al-Zn-In-Mg-Ti sacrificial anode, which is usually used in shallow sea area, was studied in a simulated deep-sea water of low dissolved oxygen via weight loss measurement, galvanostatic method, potentiodynamic polarization curves, electrochemical impedance spectroscopy and cyclic voltammograms test and scanning electron microscope (SEM/EDS), in terms of the open circuit potential, work potential, actual electric capacity, electric current efficiency and corrosion morphology of the Al-Zn-In-Mg-Ti sacrificial anode. It was found that, the dissolution rate of the Al-Zn-In-Mg-Ti sacrificial anode decreased in the simulated seawater of a low dissolved oxygen. The re-deposition process of the active elements was suppressed and the oxide scale on the anode surface was hard to be dissolved. Correspondingly, both the discharge performance and the current efficiency decrease, therefore a corresponding design margin should be set aside in the design course of cathodic protection.

Key words: deep water environment low dissolved oxygen sacrificial anode electrochemical performance

Received: 15 October 2019

ZTFLH:

TG174

Fund: Doctor Startup Fund of Liaoning Province(201601181);General Scientific Research Project of Liaoning Education Department(L2015464);“Seedling Cultivation” Project for Young Scientific and Technological Talents of Liaoning Education Department(LG201928)

Corresponding Authors: SUN Haijing E-mail: hjsun@alum.imr.ac.cn

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Cite this article:

SUN Haijing, QIN Ming, LI Lin. Performance of Al-Zn-In-Mg-Ti Sacrificial Anode in Simulated Low Dissolved Oxygen Deep Water Environment. Journal of Chinese Society for Corrosion and protection, 2020, 40(6): 508-516.

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https://www.jcscp.org/EN/10.11902/1005.4537.2019.180 OR https://www.jcscp.org/EN/Y2020/V40/I6/508

Fig.1 OCP vs time curves for Al-Zn-In-Mg-Ti sacrificial anode in two different dissolved oxygen environments

Fig.2 CCP vs time curves for Al-Zn-In-Mg-Ti sacrificial anode in two different dissolved oxygen environments

Table 1 Electrochemical performance of Al-Zn-In-Mg-Ti sacrificial anode in two different dissolved oxygen environments

Fig.3 Macroscopic morphologies of corroded Al-Zn-In-Mg-Ti sacrificial anode after discharge test in two environments with SDO (a) and LDO (b)

Fig.4 Microscopic morphologies of Al-Zn-In-Mg-Ti sacrificial anode without corrosion products after discharge test in two environments with SDO (a) and LDO (b)

Table 2 Mass losses of Al-Zn-In-Mg-Ti alloy immersed for 168 h in artificial seawaters with different concentrations of dissolved oxygen

Fig.5 Potentiodynamic polarization curves of Al-Zn-In-Mg-Ti alloy in artificial seawaters with different concentrations of dissolved oxygen

Fig.6 Cyclic voltammetry curves of Al-Zn-In-Mg-Ti alloy in artificial seawaters containing different concentrations of dissolved oxygen

Fig.7 Nyquist plots of Al-Zn-In-Mg-Ti alloy in artificial seawaters containing different concentrations of dissolved oxygen

Fig.8 Equivalent circuits for fitting EIS data obtained in artificial seawaters containing SDO (a) and LDO (b)

Table 3 Parameters extracted from EIS data of Al-Zn-In-Mg-Ti alloy in artificial seawaters containing different concentrations of dissolved oxygen

Fig.9 Macroscopic morphologies of Al-Zn-In-Mg-Ti alloy immersed for 168 h in artificial seawaters containing SDO (a) and LDO (b)

Fig.10 Microscopic morphologies of Al-Zn-In-Mg-Ti alloy immersed for 168 h in artificial seawaters containing SDO (a) and LDO (b), and the magrified images of areas I in Fig.10a (c) and II in Fig.10c (d)

Fig.11 EDS analysis results in the marked areas of Al-Zn-In-Mg-Ti alloy immersed for 168 h in artificial seawaters containing SDO (a) and LDO (b)

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