Measurement and Modeling of Pitting Depth Distribution for Phosphor Bronze Tapes Used in Underground Power Transmission Cables

作者：Zhou Hang^*; Gnanasambandam Sivashangari; Foresta Maurizio; Weston David; Li Fan; Pan Jingzhe; Le Blanc Michelle

来源：Corrosion, 2017, 73(7): 844-852.

DOI：10.5006/2227

• maximum pit depth model
• Monte Carlo simulations
• oil-filled underground power cables
• phosphor-bronze corrosion
• pit growth modeling

Phosphor bronze tapes used in underground power transmission cables are affected by pitting corrosion that can lead to cable failures. In the present work, the probability distribution of corrosion pit depth on phosphor bronze tape is investigated using Monte Carlo simulations and compared with the measured pit depth distribution of such tapes which have been in service for about 45 years. The pit depth as a function of time is modeled as y(t) = alpha(t)(beta), where y is the pit depth, and alpha and beta are pitting proportionality and exponent factors. A Monte Carlo simulation is performed to generate the pit depth distribution by keeping beta as constant and varying a using three-parameter generalized extreme value (GEV) distribution. It was observed that the simple power law is capable of predicting the evolution of pit depth distribution and also the distribution under different environmental conditions. This predictive pit depth distribution model will be a valuable tool to decide the extent of pitting corrosion in phosphor bronze tape used in underground power transmission cables.

• 出版日期2017-7