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 a testing method was studied here. For this test, 21cm×3mm×0.05mm copper ribbon specimens coated with test oils were immersed in 1-N or 0.1-N of HCl aqua solution. Good and effective oil film protects the corrosion by HCl, so that the electrical conductance of ribbon specimen was not changed easily, but it was soon changed when bad one coated on the ribbon 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, concentrations of HCl, test period which is adequate to evaluate oil, oil amount, etc. to standardize of this rusting test.
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