酸性介质中桂圆壳碳点对碳钢的缓蚀性能研究

doi:10.11902/1005.4537.2021.214

中国腐蚀与防护学报

2022, Vol. 42

Issue (4): 629-637 DOI: 10.11902/1005.4537.2021.214

研究报告

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酸性介质中桂圆壳碳点对碳钢的缓蚀性能研究

陈佳起, 侯道林, 肖晗, 高雨薇, 董社英(

)

西安建筑科技大学化学与化工学院西安 710311

Corrosion Inhibition on Carbon Steel in Acidic Solution by Carbon Dots Prepared from Waste Longan Shells

CHEN Jiaqi, HOU Daolin, XIAO Han, GAO Yuwei, DONG Sheying(

)

School of Chemistry and Chemical Engineering, Xi'an University of Architecture and Technology, Xi'an 710311, China

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摘要:

为开发环境友好、高缓蚀效率的新型缓蚀剂,以桂圆壳生物质为碳源,通过煅烧法和水热法分别合成桂圆壳碳点 (longan shell-CDs,ls-CDs) 和氮掺杂桂圆壳碳点 (N-lsCDs)。在此基础上,本文通过FT-IR、XPS、TEM、电化学方法、荧光光谱分析 (FL) 和静态失重法等手段对其光学性质、结构组成和缓蚀性能进行了测定分析。结果表明：在1 mol·L^-1 HCl体系中,当ls-CDs和N-lsCDs的浓度为100和20 mg·L^-1时,对Q235钢的缓蚀效率分别达到89.49%和92.41%。尤其是N-lsCDs,具有投加量低、原料废物利用、缓蚀性能优异的特点。极化曲线测试表明N-lsCDs为混合型抑制剂,并且N-lsCDs在碳钢表面的吸附符合Langmuir吸附等温式,同时存在物理吸附与化学吸附。利用生物质为原料制备环保新型缓蚀剂能够变废为宝,具有诱人的潜在应用前景。

关键词 ：碳钢缓蚀剂, 生物质, 碳点, 吸附

Abstract：

In order to develop new environment-friendly corrosion inhibitors of high corrosion inhibition efficiency, longan shell carbon dots (ls-CDs) and nitrogen doped longan shell carbon dots (N-lsCDs) were synthesized by calcination and one-pot hydrothermal methods, respectively. Meantime, the structural, composition, optical property, and corrosion inhibition performance of ls-CDs and N-lsCDs were assessed by means of FT-IR, FL, XPS, TEM, electrochemical method, and static mass loss method. Results showed that when the concentration of ls-CDs and N-lsCDs was 100 and 20 mg·L^-1 in 1 mol·L^-1 HCl solution, the corresponding corrosion inhibition efficiency for Q235 steel reaches 89.49% and 92.41% respectively. Besides, the N-lsCDs present advantages, such as excellent corrosion inhibition performance in low dosage etc., and it is especially noticeable that the N-lsCDs could be produced from the longan shell as waste. The polarization curve test results showed that N-lsCDs is a mixed inhibitor, and the adsorption of N-lsCDs on the surface of carbon steel conforms to the Langmuir adsorption isotherm. Using biomass as raw material to prepare new environment-friendly corrosion inhibitor can turn waste into resources, which has attractive potential application prospects.

Key words： carbon steel corrosion inhibitor biomass carbon dot adsorption

收稿日期: 2021-08-26

ZTFLH:

TG174.42

基金资助:国家级大学生创新创业训练计划(202010703056);陕西省重点研发计划(2020GY-306)

通讯作者: 董社英 E-mail: dongsyy@126.com

Corresponding author: DONG Sheying E-mail: dongsyy@126.com

作者简介: 陈佳起,男,1999年生,本科生

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引用本文:

陈佳起, 侯道林, 肖晗, 高雨薇, 董社英. 酸性介质中桂圆壳碳点对碳钢的缓蚀性能研究[J]. 中国腐蚀与防护学报, 2022, 42(4): 629-637.
Jiaqi CHEN, Daolin HOU, Han XIAO, Yuwei GAO, Sheying DONG. Corrosion Inhibition on Carbon Steel in Acidic Solution by Carbon Dots Prepared from Waste Longan Shells. Journal of Chinese Society for Corrosion and protection, 2022, 42(4): 629-637.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2021.214 或 https://www.jcscp.org/CN/Y2022/V42/I4/629

图1 ls-CDs和N-lsCDs的红外光谱及不同浓度的荧光光谱

图2 Q235钢在含不同浓度ls-CDs和N-lsCDs的1 mol·L-1 HCl溶液中的电化学阻抗图

表1 Q235钢在ls-CDs和N-lsCDs不同浓度的阻抗拟合参数

图3 Q235钢在含不同浓度ls-CDs和N-lsCDs的1 mol·L-1 HCl溶液中的极化曲线

表2 Q235钢在含不同浓度ls-CDs和N-lsCDs的1 mol·L-1 HCl溶液中的极化曲线拟合参数

图4 N-lsCDs的TEM像及粒径分布图

图5 N-lsCDs的XPS光谱图及C1s、O1s和N1s的高分辨率图

图6 N-lsCDs浓度与腐蚀速率 (CR) 和缓蚀效率 (η) 的关系曲线

表3 Q235钢在不同温度下含不同浓度N-lsCDs的1 mol·L-1 HCl溶液中的腐蚀速率和缓蚀效率

表4 Q235钢在含20 mg·L-1 N-lsCDs的1 mol·L-1 HCl溶液中不同温度下的阻抗参数

表5 Q235钢在含20 mg·L-1 N-lsCDs的1 mol·L-1 HCl溶液中不同温度下的极化参数

图7 Q235钢在含不同浓度N-lsCDs的1 mol·L-1 HCl溶液中的Arrhenius图

图8 Q235钢在含不同浓度N-lsCDs的1 mol·L-1 HCl溶液中的过渡态理论图

图9 N-lsCDs在1 mol·L-1 HCl溶液中Q235钢表面的吸附等温线

图10 Q235钢在1 mol·L-1 HCl溶液中不同条件下浸泡8 h后纯水在其表面的接触角

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