Some Limitations of the Linear Polarization Techniques in Evaluating Corrosion Behavior Available to Purchase

In a recent article¹  in Corrosion, Indig and Groot report studies on the corrosion rate of a stainless steel in an alkaline aqueous solution at 288 C. The solution contained dissolved hydrogen gas and corrosion presumably resulted from the concomitant electrochemical reactions

and

The authors also consider the alternatives to (1) in which Me₃0₄ or Me₂0₃ is the product oxide.

They determined the corrosion rate in their experiments, which lasted 14 days, both by a weight loss technique and by use of the Stern-Geary “linear polarization” method.²  Disconcertingly, the rates measured by the two techniques differed by almost a...