A method of inhibitor evaluation based on measurement of hydrogen evolved during corrosion, apparatus used, evaluation procedure and typical test results are given. The method was developed to simulate oil well corrosion as closely as possible and still give rapid evaluation results. Hot brine is passed continuously by an iron coupon and subsequently discharged from the system to prevent build-up of corrosion products. Simulation of fluid flow is accomplished by rotating the sample and provision is made for introduction of a gas in the brine. The gas and liquid leaving the iron coupon are separated and the amount of hydrogen in the gas stream determined. This provides a means of continuously measuring the rate of hydrogen evolution and consequently of the corrosion rate. Effect of a chemical on this rate is determined by injecting it into the flow stream in front of the sample and recording the change in rate of hydrogen evolution. Oil is not used in the liquid stream because oil well corrosion is an ionic process and occurs only when metal is in contact with water.

Subject
Water, Inhibitor performance, Corrosion rate, Hydrogen evolution, Oil wells, Sulfites, Liquids, Chemical inhibition, Sodium, Corrosion inhibitors, Carbon dioxide, Corrosion coupons, Hydrogen
Copyright 1952 by the National Association of Corrosion Engineers.
1952
You do not currently have access to this content.