苯甲酸钠在酸性Zn-Ni镀液中对Zn阳极溶解行为影响的研究

doi:10.11902/1005.4537.2021.163

中国腐蚀与防护学报

2022, Vol. 42

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

研究报告

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苯甲酸钠在酸性Zn-Ni镀液中对Zn阳极溶解行为影响的研究

刘永强¹, 刘光明¹(

), 范文学², 唐荣茂¹, 甘鸿禹¹, 师超¹

^1.南昌航空大学材料科学与工程学院南昌 330063
^2.安徽鼎旺环保材料科技有限公司宣城 242000

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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摘要:

采用电化学阻抗谱 (EIS)、动电位极化曲线研究了酸性Zn-Ni镀液 (AZNB) 中苯甲酸钠 (SB) 浓度对Zn阳极溶解行为及缓蚀率的影响。结果表明,AZNB中添加SB后对 Zn的溶解具有良好抑制作用；当SB浓度在30 $~$ 120 mg/L范围内增加时,对Zn的缓蚀效率逐渐增大；SB是一种阳极型缓蚀剂。静态腐蚀失重法研究表明,当AZNB中SB浓度相同时,温度升高,缓蚀效率降低。采用等温吸附曲线研究表明,SB在Zn阳极表面满足Langmuir等温吸附模型,温度升高使缓蚀剂分子在Zn表面的吸附平衡常数减小,导致其吸附能力降低。在不同温度条件下SB分子在Zn表面吸附是由物理吸附和化学吸附混合控制自发进行的熵增过程。

关键词 ：酸性Zn-Ni镀液, Zn阳极, 苯甲酸钠, 缓蚀, 吸附

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

收稿日期: 2021-07-13

ZTFLH:

TG174

基金资助:国家自然科学基金(51961028)

通讯作者: 刘光明 E-mail: gemliu@126.com

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

作者简介: 刘永强,男,1996年生,硕士生

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引用本文:

刘永强, 刘光明, 范文学, 唐荣茂, 甘鸿禹, 师超. 苯甲酸钠在酸性Zn-Ni镀液中对Zn阳极溶解行为影响的研究[J]. 中国腐蚀与防护学报, 2022, 42(4): 605-612.
Yongqiang LIU, Guangming LIU, Wenxue FAN, Rongmao TANG, Hongyu GAN, Chao SHI. 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.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2021.163 或 https://www.jcscp.org/CN/Y2022/V42/I4/605

图1 酸性Zn-Ni镀液中含不同浓度SB时Zn的极化曲线

表1 酸性Zn-Ni镀液中含不同浓度SB时Zn极化曲线的拟合参数

图2 酸性Zn-Ni镀液中含不同浓度SB时Zn的电化学阻抗谱及等效电路

表2 酸性Zn-Ni镀液中含不同浓度SB时电化学阻抗等效电路拟合参数

图3 不同温度和浓度条件下Zn在酸性Zn-Ni镀液中的失重曲线及Zn的缓蚀率变化曲线

图4 在未添加和添加SB的酸性Zn-Ni镀液中Zn的表面形貌

图5 苯甲酸钠在Zn表面两种不同模型的等温吸附线

图6 不同温度条件下SB在Zn表面的等温吸附曲线

表3 不同温度下等温吸附曲线的拟合结果

图7 SB在Zn表面吸附的lnKL/T -1的关系曲线

表4 不同温度条件时SB在Zn表面的热力学函数参数

图8 Zn的腐蚀溶解过程及缓蚀剂SB分子吸附的模型图

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