Stern-Geary Constant for X80 Pipeline Steel in the Presence of Different Corrosive Microorganisms

The Stern-Geary constant(B value)is indispensable to measure the corrosion rate in the microbiologically influenced corrosion(MIC)systems.Linear polarization resistance(LPR)and weight loss methods were used to study the variation of B values for X80 pipeline steel in the presence of Pseudomonas aeruginosa,Acetobacter aceti and Desulfovibrio vulgaris.The results showed that B values in the presence of three different bacteria were 35.60±0.55 mV,33.00±1.00 mV and 58.60±0.55 mV,respectively,suggesting that the change of corrosion system significantly affected the B values of X80 pipeline steel.This work further indicated that the determination of B values is necessary to accurately measure the MIC rate by LPR method.

模拟水泥孔溶液环境下钢筋阻锈剂对极化电阻常数的影响

混凝土结构中的钢筋锈蚀问题是世界范围内影响混凝土耐久性的一个主要问题。一些非损伤性的试验方法不断用以监控和判断混凝土内的钢筋锈蚀状况。极化方法已经成为实验室和实地检测中广泛采用的一种监控锈蚀率的方法。然而,当混凝土中添加了钢筋阻锈剂后,极化测量的表达和该实验方法的适用性会相应出现一些变化。本工作旨在测量钢筋阻锈剂对模拟混凝土孔隙液环境中碳钢极化电阻常数的变化影响。结果表明,钢筋阻锈剂会改变极化电阻常数,因此在测量添加有钢筋阻锈剂的混凝土钢筋锈蚀率时,建议先测定极化电阻常数。