水杨醛类吡啶甲酰腙席夫碱对碳钢在海水中缓蚀行为的研究  

Corrosion Inhibitor of Salicylic Aldehyde Pyridine Hydrazone for Mild Steel in Seawater

作　　者：刘峥[1] 刘洁[1] 刘进[1] 刘宝玉[1] 

机构地区：[1]桂林理工大学化学与生物工程学院,桂林541004

出　　处：《中国腐蚀与防护学报》2013年第2期109-116,共8页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金(21266006);广西自然科学基金(2012GXNSFAA053034)资助

摘　　要：合成了3种水杨醛类吡啶甲酰腙席夫碱化合物(L1、L2、L3)。以失重法、电化学方法、扫描电镜和分子动力学模拟方法考察它们在海水中对低碳钢的缓蚀行为,探讨其缓蚀机理和吸附行为。结果表明,3种酰腙席夫碱属混合型缓蚀剂,在海水中均能有效的抑制碳钢的腐蚀。缓蚀能力的大小遵循L3>L2>L1,失重实验显示当L3浓度为2.8×10-4mol/L时,缓蚀率最大为87.8%。其在碳钢表面上的吸附符合Langmuir吸附等温式,是自发放热吸附过程,吸附机理为化学吸附,扫描电镜和分子动力学模拟结果也证明了3种酰腙席夫碱特别是L3可有效的抑制海水对低碳钢的腐蚀。Three kinds of salicylic aldehyde pyridine formyl hydrazone Schiff bases compounds were synthesized. Their inhibition and adsorption behavior on low carbon steel in seawater were investigated by weight loss method, electrochemical methods, scanning electron microscopy and molecular dynamics simulations,respectively. Experiment results indicated that three kinds of salicylic aldehyde pyridine formyl hydrazone Schiff bases behaved as the mixed type inhibitors, and the inhibitors were excellent inhibitors for low carbon steel in seawater. Their capacity of inhibition were： L3〉 L2〉 L1.The weight loss method showed that the inhibition efficiency of L3 reaches 87.8% with the inhibitor concentration of 2.8×10^-4mol/L. The adsorption of the three inhibitors on the surface of carbon steel were found to follow the Langmuir adsorption isotherm, which is a spontaneous exothermic process and the adsorption mechanism was chemisorption. Scanning electron microscopy and molecular dynamics simulations also proved that three kinds of Schiff bases, in particular, the L3 can effectively inhibit the seawater corrosion of low carbon steel.

关 键 词：酰腙席夫碱 低碳钢 海水 吸附 缓蚀 

分 类 号：O646.6[理学—物理化学]