The Influence of the Volatile Ifhan-114 Inhibitor on the Efficiency of a Number of Contact Galvanic Metal Pairs and Rate of Corrosion of Their Constituents in the Atmosphere of Livestock Premises

Resumo

The protective ability of the volatile IFHAN-114 inhibitor in the corrosion of models of macrogalvanic steel/brass, steel/copper, and copper/brass pairs under conditions simulating the atmosphere of livestock premises is studied. The content of CO₂, NH₃, and H₂S (corrosion stimulators) was 0.2–0.6 vol %, 20–60 mg/m³, and 10–30 mg/m³, respectively. The ability of IFHAN-114 to suppress the generation of the faradaic current by the models of galvanic pairs is investigated. It is shown that the surface of metals forming the galvanic pairs undergoes intensive pitting and ulcer corrosion when there is no inhibitor under the effect of one corrosion stimulator (CS) or simultaneous effect of two or three corrosion stimulators. In most cases, the introduction of IFHAN-114 into the gas phase completely suppresses the local corrosion of metals forming the galvanic pairs and reduces the rate of their general corrosion (which is uniform when the volatile corrosion inhibitor is used) by 2–5 times. The inhibitor introduced into the 0.1 M KCl solution significantly suppresses the density of the current generated by the models of galvanic steel/brass and copper/brass pairs. However, this effect is observed only after 200 min of exposure of the pair models to corrosion.