Discussions

Discussion by Ulick Evans, Cambridge, England: The extremely interesting paper by Schaschl and Marsh has led to some friendly correspondence about the relationship between laboratory results and field behavior. Mr. Marsh has kindly suggested that readers of Corrosion might care to know my views. I should rather welcome an opportunity to make them known, since several American friends have told me that the plan of using the break in the I-V curve of a pipe line as a sign of adequate protective current arose partly out of a paper published 26 years ago from my laboratory.¹  That paper described the first part of a pure-science research which later established the fact that the electric current flowing on iron partly immersed in chloride solution is equivalent, in the sense of Faraday’s law, to the measured corrosionrate.²  The object of the research was to study the scientific mechanism of corrosion...