EFFECT OF CERTAIN INHIBITORS ON THE COEFFICIENT OF PROPORTIONALITY BETWEEN THE POLARIZATION RESISTANCE AND CORROSION RATE OF LOW-CARBON STEEL IN SULFURIC-ACID AND TAP WATER

The empirical coefficients of proportionality between polarization res istance (R(p)) and the corrosion rate of low-carbon steels in sulfuric acid and tap water were determined from mass loss and measurements of R(p)) with R5035 and R5126 instruments. The coefficient K depends app reciably on the nature and concentration of acid-etching inhibitors (K hOSP-10, katapin K, S-5, KPI-3, KPI-9, and I-1-V), on the concentratio n of inhibited sulfuric acid, and on the presence iron salts. In tap w ater, the coefficient K depends on the nature of the inhibitor (IF-1, VFZ-II), mixing, and temperature of inhibited water. A relationship be tween the coefficient K and the effectiveness of the inhibitors was no ted. Anomalous changes in coefficient K are related to the influence, neglected during the measurement of R(p), exerted by the ohmic resista nce of the adsorption films formed on the surface of steel during the adsorption of inhibitors.