Cailiao Baohu (Jul 2023)

Research on AC Corrosion Behavior of X65 Pipeline Steel and Sacrificial Anode Materials in Seawater Environment

  • WANG Hongguang, DONG Kun, HUANG Haojun, WANG Baosen, TIAN Nianpei, LIANG Yi, DU Yanxia

DOI
https://doi.org/10.16577/j.issn.1001-1560.2023.0160
Journal volume & issue
Vol. 56, no. 7
pp. 47 – 56

Abstract

Read online

Currently，few studies have been conducted on the AC corrosion behavior of pipeline steel and sacrificial anodes in the marine environment.In order to provide a reference for evaluating the AC corrosion risk of submarine pipeline and the consumption performance of sacrificial anodes under AC interference，the AC corrosion simulation test was employed to study the AC corrosion behavior of X65 pipeline steel，aluminum alloy and zinc alloy sacrificial anodes under different AC current densities in simulated seawater environment.Results showed that the potential of X65 pipeline steel，aluminum alloy sacrificial anode and zinc alloy sacrificial anode samples were negatively shifted after AC interference was applied，and the greater the AC current density，the greater the offset.The corrosion rates of three materials increased with the increase of AC current density，but the corrosion rate of aluminum alloy was much higher than that of zinc alloy and X65 pipeline steel.Moreover，X65 pipeline steel exhibited uniform corrosion under 0～30 A/m2 AC interference，and when the AC current density increased to 100 A/m2，pitting pits appeared on the surface.Aluminum alloy exhibited pitting corrosion on the surface under different AC current densities，while zinc alloy was mainly uniform corrosion.In the marine environment，the service performance of zinc alloy was superior to that of aluminum alloy.

Keywords