向日葵盘提取物在0.5mol/L H2SO4溶液中对碳钢的缓蚀作用

Corrosion Inhibition of Sunflower Head Extract to Carbon Steel in 0.5mol/L H2SO4 Solution

以超声辅助法提取得到的向日葵盘提取物(HALE)为缓蚀剂,采用腐蚀浸泡试验、电化学试验研究HALE在0.5mol/L H2SO4溶液中对碳钢的缓蚀作用。结果表明:HALE对碳钢缓蚀效果良好,缓蚀率随HALE加量增加而增大,但随温度升高而降低;HALE在碳钢表面的吸附符合Langmuir吸附模型,是以物理吸附为主的混合吸附;电化学测试结果表明HALE是偏阳极混合抑制型缓蚀剂。

Sunflower head extract(Helianthus annuus L.extract,HALE)obtained by ultrasonic assisted extraction was used as an inhibitor.The corrosion inhibition of HALE to carbon steel in 0.5 mol/L H2SO4 solution was studied in corrosion immersion test and electrochemical testing.The results show that HALE had a good corrosion inhibition effect to carbon steel,and the corrosion inhibition rate increased with the increase of HALE dosage,but decreased with the increase of temperature.The adsorption of HALE on the surface of carbon steel conformed to the Langmuir adsorption model and was a mixed adsorption based on physical adsorption.Electrochemical test results showed that HALE was an anode-based mixed inhibitor corrosion inhibitor.