The rate of reaction of iron and hydrogen sulfide has been studied in an oxygen-free system in the presence of sodium chloride brine, in the presence and absence of an oil phase under a constant mixing rate at 40 C and 80 C.

The experimental data are plotted according to a previously derived equation for the iron-acetic acid system, and are shown to be in agreement with that equation. Values of K, the overall reaction velocity, are obtained from the slopes. From the K values for three sets of experiments at 40 C and 80 C, values for the temperature coefficient
are calculated, and are shown to correspond to the range of values expected for diffusional control. The presence of an oil phase seems to have little influence on the reaction rate.

Another group of measurements on the iron-hydrogen sulfide system was carried out in the presence of corrosion inhibitors. While all the data of the inhibited reactions will show reasonable straight line plots, when plotted according to the diffusional equation, such plots have little meaning with the good inhibitors, because there is no essential change with time in the loss-in-weight values when they are used at 50 ppm. There seems to be some possibility that good inhibitors function by forming a particularly efficient non-permeable adsorbed film with iron sulfide corrosion products. 6.2.2

Subject
Hydrogen sulfide, Metal surfaces, Diffusion, Iron sulfides, Iron, Corrosion reactions, Minerals, Liquids, Experimental data, Film formation, Corrosion inhibitors, Brines, Chemical reactions
© 1960 National Association of Corrosion Engineers
1960
You do not currently have access to this content.