Abstract
The corrosion of iron–chromium alloys in phosphoric acid varies with time as protective and non-protective films are formed. This is difficult to study by traditional weight-loss methods and misleading results can be obtained By means of the linear polarisation technique it has been shown that this variation can easily be monitored. The method has been carefully checked against weight-loss methods taking care of the variation with time. By measurement of corrosion rate as a funciion of potential it has been possible to reconstruct potential-log current density data and compare these with short term polarisation tests. The corrosion of iron–chromium alloys containing up to 7%Cr takes place because the free corrosion potential cannot exceed the Flade potentialfor this alloy in phosphoric acid at any concentration.
Get full access to this article
View all access options for this article.