Patent ID: 7619423
Filing Date: 2009-11-17
Classification: G01N

Abstract:
1. A direct testing method of anticorrosion performance of an aqueous protective fluid comprising: immersing a plurality of N electrodes insulated from each other to form a testing electrode having a working face into an aqueous protective fluid, with a reference electrode being disposed at a predetermined space, and measuring electrical resistance R i sequentially at each of the N electrodes with respect to the reference electrode by using an Ohmmeter with a power source, wherein only the working face of the testing electrode is contacted with the aqueous protective fluid; and the anticorrosion performance of the aqueous protective fluid is determined by the distribution of resistances in low resistance regions; wherein the distribution of resistances in low resistance regions is expressed by n 1 , n 2 , n 3 , n 4 , and n 5 ; where n 1 is the total number of electrodes in N electrodes whose resistance values are in the range of ≦10 3 Ω; and wherein n 2 , n 3 , n 4 and n 5 is the total number of electrodes in N electrodes whose resistance values are in the order of 10 4 Ω, 10 5 Ω, 10 6 Ωand 10 7 Ω respectively; wherein n =n 1 +0.9n 2 +0.75n 3 +0.5n 4 +0.2n 5 is assumed to express the equivalent number of corroded electrodes in N electrodes under the action of corrosive medium, and the lower the n value, the stronger the anticorrosion capability.