| 摘要 |
PURPOSE:To make possible the quick and sure measurement by brining the other one electrode which consists of the same material as the material of an object to be inspected and is held in an activated stage into contact with the object to be inspected through filter paper or the like impregnated with a normal concn. of electrolyte. CONSTITUTION:The relatively flat surface of the object 1 which is made of, for example, SUS304 stainless steel and is to be inspected is selected and the filter paper 3 impregnated with 1N concn. of sulfuric acid soln. as the electrolyte is pressed onto said surface and further the electrode 2 made of SUS304 stainless steel which is the same material as the above-mentioned body is superposed thereon after the surface thereof is throughly activated by polishing the surface with emery paper to form an electric circuit. The value indicated on a potentiometer 4 is measured with lapse of time and is compared with the value obtd. preliminarily with the object treated under the same conditions as for the standard object to be inspected. The numerical value of the initial potential thereof and the sustaining time of the potential are compared by which the discrimination of the passivation effect is made possible. |
