豆粕提取物在盐酸中对Q235钢的缓蚀性能

doi:10.11902/1005.4537.2018.118

中国腐蚀与防护学报

2019, Vol. 39

Issue (3): 267-273 DOI: 10.11902/1005.4537.2018.118

研究报告

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豆粕提取物在盐酸中对Q235钢的缓蚀性能

王霞(

),任帅飞,张代雄,蒋欢,古月

西南石油大学材料科学与工程学院成都 610500

Inhibition Effect of Soybean Meal Extract on Corrosion of Q235 Steel in Hydrochloric Acid Medium

Xia WANG(

),Shuaifei REN,Daixiong ZHANG,Huan JIANG,Yue GU

School of Material Science and Engineering, Southwest Petroleum University, Chengdu 610500, China

全文: PDF(4021 KB) HTML

摘要:

采用失重法、极化曲线、电化学阻抗谱、扫描电子显微镜等方法研究了豆粕提取物 (SME) 作为植物缓蚀剂对Q235钢的缓蚀性能。结果表明，缓蚀剂在25~90 ℃范围内，随着温度升高，缓蚀效率先升高后降低。在温度为40 ℃，缓蚀剂浓度为0.8 g/L时，缓蚀效率达到92%。缓蚀剂对阳极和阴极都有抑制作用，属于混合型缓蚀剂。缓蚀剂分子在Q235钢表面的吸附符合Langmuir等温吸附模型，既有化学吸附也有物理吸附。

关键词 ：豆粕, 植物缓蚀剂, Q235钢, 动电位极化曲线, 电化学阻抗谱

Abstract：

The inhibition effect of soybean meal extract (SME) on the corrosion of Q235 carbon steel in 1 mol/L HCl solution was investigated by weight loss method, potentiodynamic polarization curve measurement, electrochemical impedance spectroscopy and scanning electron microscope. The inhibition efficiency increased and then decreased with the increasing temperature in the range of 25~90 ℃. With a dose of 0.8 g/L SME, the inhibition efficiency was 92% at 40 ℃, and the SME acted as a mixed-type inhibitor. The adsorption of SME on Q235 steel accorded with Langmuir isothermal equation, and including chemical and physical adsorption.

Key words： soybean meal plant corrosion inhibitor Q235 steel polarization curve electrochemical impedance spectroscopy

收稿日期: 2018-08-25

ZTFLH:

TG174.42

基金资助:国家自然科学基金(51774242)

通讯作者: 王霞 E-mail: swpi_wx@126.com

Corresponding author: Xia WANG E-mail: swpi_wx@126.com

作者简介: 王霞，女，1966年生，教授

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引用本文:

王霞,任帅飞,张代雄,蒋欢,古月. 豆粕提取物在盐酸中对Q235钢的缓蚀性能[J]. 中国腐蚀与防护学报, 2019, 39(3): 267-273.
Xia WANG, Shuaifei REN, Daixiong ZHANG, Huan JIANG, Yue GU. Inhibition Effect of Soybean Meal Extract on Corrosion of Q235 Steel in Hydrochloric Acid Medium. Journal of Chinese Society for Corrosion and protection, 2019, 39(3): 267-273.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2018.118 或 https://www.jcscp.org/CN/Y2019/V39/I3/267

图1 豆粕提取物的FT-IR谱

图2 Q235钢在不同温度下HCl溶液中的缓蚀效率随缓蚀剂SME浓度的变化

图3 Q235钢在40 ℃下含不同浓度SME的1 mol/L HCl溶液中的动电位极化曲线

表1 Q235钢在40 ℃下含不同浓度SME的1 mol/L HCl溶液中的动电位极化曲线参数

图4 Q235钢在40 ℃下含不同浓度SME的1 mol/L HCl溶液中的电化学阻抗谱

图5 等效电路图

表2 Q235钢在40 ℃下未加和添加不同浓度SME的1 mol/L HCl溶液中的电化学阻抗谱参数

图6 不同温度下Q235钢在含不同浓度SME的1 mol/L HCl溶液中的Langmuir吸附等温模型

表3 不同温度下Q235钢在含不同浓度SME缓蚀剂的1 mol/L HCl溶液中的Langmuir吸附参数

图7 SME缓蚀剂在Q235钢表面吸附的ln Kads与1000/T关系曲线

表4 Q235钢在不同温度下含SME缓蚀剂的1 mol/L HCl溶液中的吸附热力学参数

图8 Q235钢在40 ℃下1 mol /L HCl溶液中腐蚀6 h前后的SEM像

图9 Q235钢在40 ℃下1 mol /L HCl溶液中腐蚀6 h前后表面的EDS分析结果

表5 Q235钢腐蚀前后表面元素含量

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