中文摘要：

采用傅里叶变换红外光谱、气相色谱-质谱、电化学阻抗谱、极化曲线和扫描电子显微镜研究了苦丁茶（KDC）提取物在含3.5%NaCl（质量分数）和饱和CO2溶液中对N80钢的缓蚀作用。结果表明：苦丁茶提取物属于混合型缓蚀剂;该缓蚀剂对N80钢在含3.5%NaCl和饱和CO2溶液中具有一定的缓蚀作用,能够有效抑制N80钢的腐蚀;缓蚀率随着缓蚀剂含量的增大而提高,当加入4%（体积分数）苦丁茶缓蚀剂时,根据极化曲线和电化学阻抗谱计算得到的缓蚀率分别达到了92.47%和96.90%。

英文摘要：

The corrosion inhibition of kudingcha（KDC）extract for N80 steel in solution with 3.5%（mass）NaCl and saturated CO2 was investigated by Fourier transform infrared spectroscopy（FTIR）,gas chromatography-mass spectrometry（GC-MS）,electrochemical impedance spectroscopy（EIS）,polarization curve and scanning electron microscopy（SEM）.The results show that the KDC extract was a mixed-type inhibitor.The KDC inhibitor had a certain corrosion inhibition for N80 steel in solution with 3.5% NaCl and saturated CO2.The inhibition efficiency increased with the concentration of inhibitor.When the volume fraction of the inhibitor was 4%,the inhibition efficiency reached 92.47% and 96.90% calculated according to polarization curve and electrochemical impedance spectroscopy,respectively.