Effect of Sodium Benzoate on Dissolution Behavior of Zn Anode in Acidic Zn-Ni Plating Bath

doi:10.11902/1005.4537.2021.163

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (4): 605-612 DOI: 10.11902/1005.4537.2021.163

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Effect of Sodium Benzoate on Dissolution Behavior of Zn Anode in Acidic Zn-Ni Plating Bath

LIU Yongqiang¹, LIU Guangming¹(

), FAN Wenxue², TANG Rongmao¹, GAN Hongyu¹, SHI Chao¹

^1.School of Material Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China
^2.China Anhui Dingwang Environmental Protection Material Technology Co. Ltd., Xuancheng 242000, China

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Abstract

The influence of sodium benzoate (SB) concentration of acid Zn-Ni plating bath (AZNB) at room temperature on the dissolution behavior of Zn and corrosion inhibition effect on Zn anode was assessed by means of static corrosion mass loss method, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization curve measurement. The results show that the addition of SB to AZNB has a good inhibitory effect on the dissolution of Zn. With the increase of SB concentration within the range of 30-120 mg/L, the corrosion inhibition efficiency for Zn gradually increases. Therefore, SB is an anode type corrosion inhibitor. When the SB concentration of AZNB is the same, the corrosion inhibition efficiency for Zn decreases with the increasing temperature. The adsorption isotherm curve revealed that SB satisfies the Langmuir isotherm adsorption model on the surface of the Zn anode. The increase in temperature reduces the adsorption equilibrium constant of the corrosion inhibitor molecules on the Zn surface, resulting in a decrease in its adsorption capacity. The changes of thermodynamic parameters when SB adsorbed on Zn surface at different temperature show that the entropy increase process of SB corrosion inhibitor molecules on the Zn surface is controlled spontaneously by a mixture of physical adsorption and chemical adsorption.

Key words: acidic Zn-Ni bath Zn anode sodium benzoate corrosion inhibition adsorption

Received: 13 July 2021

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(51961028)

Corresponding Authors: LIU Guangming E-mail: gemliu@126.com

About author: LIU Guangming, E-mail: gemliu@126.com

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Cite this article:

LIU Yongqiang, LIU Guangming, FAN Wenxue, TANG Rongmao, GAN Hongyu, SHI Chao. Effect of Sodium Benzoate on Dissolution Behavior of Zn Anode in Acidic Zn-Ni Plating Bath. Journal of Chinese Society for Corrosion and protection, 2022, 42(4): 605-612.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2021.163 OR https://www.jcscp.org/EN/Y2022/V42/I4/605

Fig.1 Polarization curves of Zn in acidic Zn-Ni plating baths containing different concentrations of SB

Table 1 Fitting parameters of polarization curves of Zn in acidic Zn-Ni plating baths containing different concentrations of SB

Fig.2 Nyquist (a) and Bode (b) diagrams of Zn in acidic Zn-Ni plating baths containing different concentrat-ions of SB and equivalent circuit of EIS (c)

Table 2 Fitting parameters of EIS of Zn in acidic Zn-Ni plating baths containing different concentrations of SB

Fig.3 Mass loss (a) and corrosion inhibition rate (b) curves of Zn in acidic Zn-Ni plating bath under different conditions of temperature and SB concentration

Fig.4 Surface morphologies of Zn in acidic Zn-Ni plating baths without (a) and with (b) SB

Fig.5 Adsorption isotherms of SB on Zn surface: (a) fre-undlich adsorption model, (b) Langmuir adsorp-tion model

Fig.6 Adsorption isotherms of SB on Zn surface under different temperature conditions

Table 3 Fitting results of adsorption isotherms at different temperatures

Fig.7 lnK_L/T^-1 curve for adsorption of SB on Zn surface

Table 4 Thermodynamic function parameters of SB on Zn surface under different temperature conditions

Fig.8 Model diagrams of the corrosion dissolution process of Zn and the adsorption of SB molecules as corrosion inhibitor

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