Abstract
A wire beam electrode using No. 70 steel wire has been developed and used to study and evaluate organic coatings in terms of the change in their electrical resistance after immersion in a salt solution. It has been found that the resistance of each wire sensor is randomly distributed over a given range of resistance, and hence to describe the DC resistance properties over the whole area of the sample coating it is necessary to employ the geometric mean, R̄ g, of the individual resistances of the sensors in the coated wire beam electrode. Indeed, for the evaluation of coatings, it is found that better reproducibility and reliability are achieved by using R̄ g rather than the overall resistance, R o1, as in the case of a conventional electrode. Good correlation between visual observations of film deterioration and R̄ g measurements was also observed.
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