论文部分内容阅读
采用电化学方法研究N,N′-双(2-亚甲基吡啶)-1,2-亚氨基乙烷(BPIE)Schiff碱在0.010 mol/L HCl溶液中对AZ91D镁合金的腐蚀抑制作用。动电位极化曲线表明,BPIE Schiff碱是一种混合型缓蚀剂。电化学阻抗谱(EIS)测量证实了BPIE的腐蚀抑制作用。随着缓蚀剂浓度的增加,由于有更多的缓蚀剂吸附在AZ91D镁合金表面,电荷转移阻力减小,双电层电容减小。电化学噪声(EN)分析获得的数据在时间和频率域与EIS和极化曲线所得结果表现出良好的一致性。采用扫描电子显微镜(SEM)、X射线衍射(XRD)和能量色散X射线(EDX),研究BPIE的缓蚀作用。SEM照片显示,在存在BPIE的情况下,AZ91D合金表面的腐蚀损伤得到减轻。XRD分析显示,在存在BPIE的情况下,对应于富镁α相的谱峰强度增大,表明合金样品的腐蚀程度低。EDX分析也证实了BPIE的缓蚀作用。此Schiff碱化合物通过物理吸附在合金表面,吸附行为遵循Langmuir等温吸附模型。
The corrosion inhibition of AZ91D magnesium alloy by N, N’-bis (2-methylenepyridine) -1,2-iminoethane (BPIE) Schiff base in 0.010 mol / L HCl solution was studied by electrochemical method. The potentiodynamic polarization curve shows that BPIE Schiff base is a mixed type corrosion inhibitor. Electrochemical impedance spectroscopy (EIS) measurements confirmed the corrosion inhibition of BPIE. With the increase of corrosion inhibitor concentration, more corrosion inhibitors adsorb on the surface of AZ91D magnesium alloy, the charge transfer resistance decreases and the electric double layer capacitance decreases. Data obtained from electrochemical noise (EN) analysis showed good agreement with EIS and polarization curves in time and frequency domain. The corrosion inhibition of BPIE was studied by SEM, XRD and EDX. SEM photographs show that corrosion damage on the AZ91D alloy surface is mitigated in the presence of BPIE. XRD analysis showed that in the presence of BPIE, the intensity of the peak corresponding to the magnesium rich alpha phase increased, indicating that the corrosion of the alloy sample was low. EDX analysis also confirmed the corrosion inhibition of BPIE. The Schiff base compound by physical adsorption on the alloy surface, adsorption behavior follows Langmuir isotherm model.