【摘要】 目的考察环己胺甲基脲(CAU)气相缓蚀剂的防腐蚀性能和成膜特性。方法采用密闭空间挥发减量实验考察了CAU气相挥发能力,通过气相缓蚀能力实验和气相防锈甄别实验研究了它对碳钢的气相缓蚀保护作用,采用ACM电极技术考察了CAU预膜对碳钢电极腐蚀电化学行为的影响,通过XPS技术分析了其在碳钢表面的吸附成膜特性。结果环己胺甲基脲的挥发性较小,72 h、50℃条件下密闭空间挥发减量大约为1.0%。经过20 h诱导期,气相缓蚀实验的碳钢试片无锈蚀。气相防锈甄别实验中,CAU可以使碳钢的腐蚀率从311.9 mg/(m~2·h)降低至64.76 mg/(m~2·h),对碳钢缓蚀效率为79.24%。CAU预膜电极电化学阻抗谱呈现弥散效应,经过30 min的CAU预膜,碳钢电极的电荷传递电阻从1.32 k?·cm~2提高到3.81 k?·cm~2。环己胺甲基脲可以挥发到达碳钢表面,通过分子中的N原子、O原子和Fe原子发生化学配位作用,吸附在碳钢表面形成保护膜。结论环己胺甲基脲是性能优良的碳钢气相缓蚀剂。更多还原

【Abstract】 The work aims to investigate the anticorrosion properties and film formation properties of cyclohexyl-aminoethyl-urea(CAU)as a volatile corrosion inhibitor(VCI).The gas volatility of CAU was investigated by volatility reduction experiment in confined space and the corrosion inhibition for mild steel was evaluated by volatile inhibiting ability(VIA)test and volatile inhibiting sieve(VIS)test.ACM scanning vibrating electrode technique was applied to study the effect of CAU on the corrosion inhibition of mild steel under a thin electrolyte layer.In addition,X-ray photoelectron spectrometry(XPS)was used to illuminate the mechanism of the film formation for CAU on the steel surface.The volatility of CAU was less and the volatile quantity was about 1.0%after 72 h in a closed space at 50℃.The steel specimens had no rust after 20 h volatilization period in the VIA test.CAU promoted the corrosion rate of mild steel to decrease from 311.9 mg/(m~2·h)to 64.76 mg/(m~2·h)in the VIS test and the corrosion inhibition rate of CAU on mild steel was 79.24%.Nyquist plots of EIS rendered a dispersion effect and the charge transfer resistance of mild steel increased from 1.32 k?·cm~2 to 3.81 k?·cm~2 after 30 min CAU pre-film process.CAU could volatilize to the surface of mild steel and formed chemical coordination on the surface through atoms N,O and Fe to form a protective film.CAU has good inhibition effect against the atmospheric corrosion of mild steel.更多还原