Abstract
Conductmetric method in testing of soft film type rust preventive oil used at a temporary coating to protect metal surface against corrosion and its standardization as antesting method was studied here. In this report, the steel wires specimen made from 3 or 5 pieces of 21cm×0.25-0.30mm∅ steel wire was used. Namely, these specimens coated with test oils were immersed in N/20-HCl aqua solution. Good and effective oil film protects the corrosion by HCl, so that the electrical conductance of steel wires specimen was not changed easily, but it was soon changed when bad one coated on the specimen which cannot protect corrosion by HCl. Electrical conductance was measured by a double bridge and it is necessary to control the technical factors such as temperature of corrosive solution, concentration of HCl, test period which is adequate to evaluate oil, number of wire pieces, diameter of wire, etc. to standardize of this rusting test. And the results of this report were compared with those of the former report in which the copper ribon specimens were used.
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