双苯并咪唑衍生物对N80钢的缓蚀效果

选用1,3-双(2-苯并咪唑基)丙烷(BBP),1,3-双(2-苯并咪唑基)-2-氧杂丙烷(DMDB),N,N-双(2-苯并咪唑亚甲基)胺(IDB),1,3-双(2-苯并咪唑基)-2-硫代丙烷(BBMS)4种结构相似的双苯并咪唑衍生物作为N80油管钢缓蚀剂。采用失重法和电化学极化测试分别考察了不同缓蚀剂的缓蚀性能及其与KI复配后在pH=4.5的饱和CO2溶液中对N80钢的缓蚀效果。结果表明,此系列双苯并咪唑衍生物在投加量较小的情况下即对N80钢均具有较好的缓蚀效果,且此系列缓蚀剂既抑制了阳极过程,又抑制了阴极过程,为混合型缓蚀剂。当1,3-双(2-苯并咪唑基)-2-硫代丙烷(BBMS)与KI复配后,缓蚀机理没有发生改变,且缓蚀率明显提高,其浓度均为2mmol/L时,缓蚀率高达95.09%。

Inhibition Properties of Bis(benzimidazole) Derivatives for N80 Steel

Four bis(benzimidazole) derivatives,1,3-bis(benzimidazol-2-yl)propane(BBP),1,3-bis(benzimidazol-2-yl)-2-oxapropane(DMDB),N,N-bis(2-benzimidazolylmethyl)amine(IDB),and 1,3-bis(benzimidazl-2-yl)-2-thiapropane(BBMS) with similar structures,were researched as corrosion inhibitors for the N80 oil pipesteel.Weight loss and electrochemistry polarization tests were carried out to evaluate the inhibition property and action with different concentration inhibitors which were compounded with KI in saturated CO2 solution at pH=4.5.The results showed that this series of bis(benzimidazole) derivatives have good corrosion inhibition for N80 steel.And they could restrain both the cathodic and the anodic processes as mixed type corrosion inhibitors.When BBMS was compounded with KI,the inhibition mechanism had not been changed.Besides,the inhibition rate significantly increased.When the concentration of BBMS and KI were both of 2mmol/L,the inhibition rate could reach 95.09%.