51316-7841-Corrosion Rate Measurement Using Electrochemical Technique

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Product Number: 51316-7841-SG

ISBN: 7841 2016 CP

Author: Jane Hall

Publication Date: 2016

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Knowledge of alloy corrosion rates at facilities is very critical for decision making such as; evaluating the lifetime of water pipelines made of alloys determining the value of internal coatings adding a corrosion inhibitor to the liquid system etc. There are different methods for measuring corrosion rate of alloys available.Of all the methods mass loss and electrochemical techniques can both be used in laboratories to help end users predict corrosion rates of the candidate alloy materials that may be used for their facilities. Mass loss involves immersion of alloy material in a field liquid for the test duration as long as possible followed by removing only the corroded product on test coupons. The corrosion rate will be estimated by the weight loss over the test duration. With the other method only a few hours will be required for electrochemical techniques to determine the corrosion rate of an alloy.This paper will present corrosion rates of a few alloys in test liquids collected from oil field blow down water samples. The corrosion rate data obtained from both the mass loss method and the electrochemical method were compared. For the electrochemical method the working electrode was made from the alloy material and cold mounted in epoxy. The electrode surface was abraded with 80 240 400 and 600 grit sandpaper to remove any machine marks. For each alloy the corrosion rates as a function of test liquid temperature oxygen level and mass transportation rate adjacent to the working electrode were investigated. In this paper the electrochemical method provided reproducible test results and a time efficient way for corrosion rate measurement.