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AC Corrosion Tests of Carbon Steel, AlZnIn Anodes and 25Cr Duplex for Subsea Applications

Abstract

This paper presents results from AC corrosion tests on 25Cr duplex and
cathodically protected carbon steel. The results show that the corrosion
rate is independent of transfer current density (0-200 A/m2) and power
frequency (50-200 Hz) on cathodically protected carbon steel. On the
anodes (AlZnIn), the corrosion rate increases as a function of transfer
current density (0-80 A/m2). However, the correlation is less prominent
at higher frequencies (100-200 Hz). For the freely corroding super
duplex, the correlation is similar to that on the anodes for the highest
current density (1000 A/m2). For the lowest current densities (100 A/m2),
the corrosion rate was independent of power frequency. Safe levels for
AC induced transfer current densities are proposed at power frequencies
of 50, 100 and 200 Hz.
KEY WORDS: Alternating Current Corrosion; Laboratory Tests;
Carbon Steel; AlZnIn Anodes; 25Cr Duplex; Current Transfer Density.

Category

Academic chapter/article/Conference paper

Client

  • Research Council of Norway (RCN) / 256507

Language

English

Affiliation

  • SINTEF Energy Research / Elkraftteknologi

Year

2021

Publisher

International Society of Offshore & Polar Engineers

Book

Proceedings of the Thirty-first (2021) International Ocean and Polar Engineering Conference, Rhodes, Greece, June 20 – 25, 2021

Issue

2021

ISBN

978-1-880653-82-1

Page(s)

2343 - 2348

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