Abstract
Mackinawite, which is formed in the cargo tanks of oil tankers by the reaction between rust and hydrogen sulphide, has been shown to oxide by a two-stage process. This paper reports that the time interval between the two stages corresponds with the evaporation of the bulk water which was necessary before pyrophoricity. The oxidation of dried samples of 3 g weight was pyrophoric when the relative humidity of the air was above about 50% but slow and controlled below 50% humidity. The presence of moisture doubled the rate of the controlled oxidation which was a first-order reaction.
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