摘要
为解决油田氧腐蚀问题,以反式对甲氧基肉桂醛、3-氨基苯甲酸为主要原料合成了具有多个吸附位点的席夫碱缓蚀剂TMCAM。首先,通过动态失重法评价了不同浓度的席夫碱缓蚀剂TMCAM在60℃含氧油田模拟配水中对Q235钢的缓蚀性能。结果表明,在TMCAM质量浓度为60 mg/L时,Q235钢的腐蚀速率为0.062 4 mm/a,满足现场要求;TMCAM投加质量浓度为100 mg/L时,Q235钢腐蚀速率仅为0.036 8 mm/a,缓蚀率可达到90%。其次,采用扫描电镜、电化学法、接触角测试等表征技术评价了TMCAM的缓蚀性能并分析其缓蚀机理。结果表明,TMCAM是一种偏阴极的混合型缓蚀剂,TMCAM分子与Fe之间的吸附能力强,且TMCAM可在钢表面形成疏水膜,减少了含氧污水与管道的接触时间,减缓了腐蚀,进而保护了管道。最后,通过分子模拟技术从理论角度分析了缓蚀剂的缓蚀性能与缓蚀剂分子构型之间的关系,结果显示TMCAM分子结构具有较强的吸附能力,高于文献报道的其他席夫碱缓蚀剂。
In order to solve the problem of oxygen corrosion in oilfields,a Schiff base corrosion inhibitor TMCAM with multiple adsorption sites was synthesized using trans-p-methoxycinnamaldehyde and 3-aminobenzoic acid as the main raw materials.Firstly,the corrosion inhibition performance of different concentrations of Schiff base corro-sion inhibitor TMCAM on Q235 steel in 60℃oxygen-containing oilfield simulated water was evaluated by the dy-namic weight loss method.The results showed that when the concentration of TMCAM was 60 mg/L,the corrosion rate of Q235 steel was 0.0624 mm/a,meeting the site requirements.When TMCAM concentration was 100 mg/L,the corrosion rate of Q235 steel was only 0.0368 mm/a,and the corrosion inhibition rate could reach 90%.Sec-ondly,the characterization techniques such as scanning electron microscopy,electrochemical method,and contact angle test were used to evaluate the corrosion inhibition performance and analyze its corrosion inhibition mecha-nism.The results showed that TMCAM was a mixed type corrosion inhibitor with a bias cathode,and the adsorption ability between TMCAM molecules and Fe was strong.Moreover,TMCAM could form a hydrophobic film on the steel surface,reducing the contact time between oxygen-containing wastewater and pipelines,slowing down corro-sion and protecting pipelines.Finally,molecular simulation technology was used to analyze the relationship between the corrosion inhibitor’s corrosion inhibition performance and the molecular configuration of the corrosion inhibitor from a theoretical perspective.The results showed that the molecular structure of TMCAM had a strong adsorption capacity,which was higher than that of Schiff base corrosion inhibitors reported in the literature.
作者
李怡成
关小红
孔兰菊
LI Yicheng;GUAN Xiaohong;KONG Lanju(School of Software,Shandong University,Ji’nan 250100,China;School of Ecological and Environmental Sciences,East China Normal University,Shanghai 200062,China)
出处
《工业水处理》
CAS
CSCD
北大核心
2023年第6期143-149,共7页
Industrial Water Treatment
关键词
席夫碱缓蚀剂
电化学
化学计算
Schiff base corrosion inhibitor
electrochemistry
computational chemistry
