Estimation of Maximum Possible Penetration Rate of Localized Corrosion in Utility Piping

概要

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The penetration rates of utility pipes were measured by examining many corroded pipes. The highest penetration rates were 0.32 and 0.96mm/y for tap- and hot-water pipes that developed tubercles, respectively. The penetration rates of limited number of pipes exposed alternately to hot and cold water and formed pits without the formation of tubercles were about 0.9mm/y. The penetration rate of localized corrosion of buried utility pipes in contact with steel reinforcement ranged from 0.1 to 3.6mm/y. The steady-state anodic current density for mild steel was obtained by the potentiostatic polarization method to estimate the maximum possible penetration rate in localized corrosion. The observed values were smaller than the estimated values due to the presence of inactive or not fully active period during the growth of localized corrosion, but were in fair agreement with the estimated values, demonstrating that the use of the steady-state anodic current density for predicting the maximum possible penetration rate is feasible.
前橋工科大学の論文
2000-03-25