Abstract
Conductmetric method in testing of soft film type rust preventive oil used as temporary coating to protect metal surface against corrosion and its standardization as testing method was studied. In this test “temperature-cancelled-out electrical resistance specimens” were used. Namely, the specimen is made from a couple of copper ribbons (21cm×3mm×0.05mm), one of them being coated and protected by rust preventive oils, while the other bare and exposed to corrode. The couple was immersed in a glass bottle, in which 1N-HCI aqua solution was poured, and after 48-72 hours, the electrical resistance of each ribbons were measured by a double bridge. The difference of each resistance is one of the measurements of rust preventability of the test oil.
One of the principal advantages of this method is that it enables the operator to make measurements while corrosion is proceeding without interrupting the test and without making separate temperature or calculations.
