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为探讨高温浓酸下曼尼希碱类缓蚀剂对油套管钢的腐蚀行为,以甲醛、苯乙酮、苯甲胺、氯化苄为原料,通过正交试验法优选合成一种曼尼希碱季铵盐缓蚀剂J-01。采用红外光谱对合成物进行结构表征,利用静态失重法、电化学法研究了其在20%盐酸腐蚀环境下对P110钢的缓蚀性能及吸附行为,并结合扫描电子显微镜测定了其在P110钢表面的腐蚀形貌特征。结果表明:当n(氯化苄)∶n(曼尼希碱中间体)=0.8∶1,反应温度为110℃,反应时间为6h时,J-01具有最好的缓蚀性能;在模拟油田腐蚀环境下,曼尼希碱季铵盐浓度、温度、盐酸含量对P110钢缓蚀性能影响显著,在20%盐酸中,腐蚀温度为130℃,缓蚀剂加量为0.5%时,缓蚀效率仍达到90%以上;曼尼希碱季铵盐属于混合型缓蚀剂,缓蚀机理主要来自曼尼希碱季铵盐分子在金属表面的吸附成膜;该缓蚀剂可在金属表面形成均匀致密的保护膜,随缓蚀剂浓度的提高,缓蚀性能增强。
In order to investigate the corrosion behavior of Mannich base corrosion inhibitor on oil casing steel under high temperature concentrated acid, formaldehyde, acetophenone, benzylamine and benzyl chloride were used as raw materials. Nickel alkali quaternary ammonium salt corrosion inhibitor J-01. The structure of the composites was characterized by FTIR, the corrosion inhibition and adsorption behavior of P110 steel were studied by static weight loss method and electrochemical method under the environment of 20% hydrochloric acid corrosive. The corrosion resistance and adsorption behavior of P110 steel were analyzed by scanning electron microscopy Corrosion of the surface morphology. The results show that J-01 has the best corrosion inhibition performance when n (benzyl chloride): n (Mannich base intermediate) = 0.8:1, reaction temperature is 110 ℃ and reaction time is 6 h. Under the corrosive environment of oil field, Mannich base quaternary ammonium salt concentration, temperature and hydrochloric acid content have a significant effect on the corrosion inhibition performance of P110 steel. In 20% hydrochloric acid, the corrosion temperature is 130 ℃ and the dosage of corrosion inhibitor is 0.5% Corrosion efficiency is still above 90%; Mannich base quaternary ammonium salt is a mixed inhibitor, the inhibition mechanism mainly from Mannich base quaternary ammonium salt molecules in the metal surface adsorption film; the corrosion inhibitor in the metal The surface of the formation of uniform and dense protective film, with the concentration of corrosion inhibitor, corrosion inhibition enhanced.