1-苯基-3-（1-环己胺）-丙烯Schiff 碱缓蚀剂在盐酸溶液中对J55 钢的缓蚀效果

Inhibition Effect of 1-Phenyl-3-（1-Cyclohexylamine）-Propylene Schiff Base Corrosion Inhibitor on J55 Steel in Hydrochloric Acid Solution

方晓君 卜晓阳

FANG Xiaojun BU Xiaoyang

为改善酸化压裂施工造成的腐蚀问题，以肉桂醛和环己胺为原料合成了Schiff 碱酸化缓蚀剂1-苯基-3-（1- 环己胺）-丙烯（PCP），通过红外光谱和气相色谱-质谱联用对其结构进行表征，并采用失重法、电化学（极化曲线、 阻抗谱、噪声）及分子动力学模拟等方法评价了PCP 的缓蚀效果。结果表明，合成产物即为目标产物PCP。在 15% HCl、90 ℃的条件下，随着PCP 浓度增加，J55 钢的失重腐蚀速率及腐蚀电流密度显著减小，缓释率逐渐增 大。不同PCP加量下的缓释率均可达到99%以上，缓蚀效果较好。在PCP加量达到0.15%时，腐蚀速率及缓释率 随着缓蚀剂浓度的增加整体变化不大，即缓蚀剂在J55 钢表面的吸附浓度已达到临界胶束浓度，吸附量不再发生 变化。PCP同时抑制了阴极析氢和阳极溶解反应，为混合型缓蚀剂。随着PCP浓度的增加，容抗弧半径、极化电 阻及噪声电阻由小到大的排序均为：空白﹤0.05%﹤0.10%﹤0.15%﹤0.20%；低频的白噪声水平在电流PSD图中 随着PCP浓度的增加而减小，即J55 钢的腐蚀速率不断减小，与失重法及极化曲线反应的规律一致。当PCP分子 与金属发生吸附并达到平衡时，整个缓蚀剂分子处于同一平面，平行吸附在J55 钢表面，达到完全覆盖，从而有效 减缓了腐蚀介质的侵入。

In order to improve the corrosion problem caused by acidizing fracturing，Schiff base acidizing corrosion inhibitor 1-phenyl-3-（1-cyclohexylamine）-propylene（PCP）was synthesized by cinnamaldehyde and cyclohexylamine. Its structure was characterized by infrared spectroscopy and gas chromatography-mass spectrometry. The corrosion inhibition effect of PCP was evaluated by weight loss method，electrochemistry（polarization curve，impedance spectrum，noise）and molecular dynamics simulation. The results showed that the synthesized product was the target product PCP. Under the condition of 15% HCl and 90 ℃， and with the increase of PCP concentration，the weight loss corrosion rate and corrosion current density of J55 steel decreased significantly，while the corrosion inhibition efficiency increased gradually. The corrosion inhibition efficiency could reach more than 99% under different PCP dosage，indicating good corrosion inhibition effect. When the dosage of PCP reached 0.15%，the overall corrosion rate and corrosion inhibition efficiency had little change with increasing concentration of corrosion inhibitor. That is，the adsorption concentration of corrosion inhibitor on the surface of J55 steel had reached the critical micelle concentration，so the adsorption amount did not change. PCP was a mixed corrosion inhibitor，which inhibited both cathode hydrogen evolution and anode dissolution reaction. With the increase of PCP concentration，the arc radius，polarization resistance and noise resistance were all arranged from small to large in following order：blank＜0.05%＜0.10%＜0.15%＜0.20%. The low frequency white noise level decreased with the increase of PCP concentration in the current PSD diagram. That is，the corrosion rate of J55 steel decreased continuously，which was consistent with the rule of weight loss method and polarization curve reaction. When PCP molecule adsorbed and balanced with the metal，the whole corrosion inhibitor molecule was in the same plane，and then adsorbed on the J55 steel surface in parallel to achieve complete coverage，thus effectively slowing down the immersion of corrosive medium.

10.19346/j.cnki.1000-4092.2024.02.018