Research On The Corrosion Behavior Of Q235 Steel And Galvanized Steel In Ganzhou Acid Red Soil Environment

With the increasing of demand for electric power, the requirements for electric power are also increasing. It is very important that the power supply equipment can operate safety. Grounding grid is a kind of security measures that can ensure the normal operation of electrical equipment and the personal safety. Grounding device includes work grounding, lightning protection grounding and protection grounding. The corrosion of grounding material will reduce the grounding performance, affecting the normal operation of the grounding device and leading to the safety accidents. In this paper, based on the acidic red soil, the corrosion behavior of Q235 steel and hot-dip galvanized steel in the soil by different experiment methods was investigated. The main results are as follows.Some steel sheet buried in Ganzhou substation site to investigate corrosion behavior. The corrosion evaluation of galvanized steel and carbon steel was obtain by studying the corrosion weight loss of specimens. The morphologies and phase composition of the corroded samples were obtain by using SEM and XRD. The results showed that the corrosion of carbon steel in red soil more serious. In acid soils, the corrosion inhibition of chemical resistance reducing agent is better than that of physical resistance-reducing agent. For carbon steel, the chemical resistance- reducing agent reduced the corrosion rate effectively in red soil. However, neither the chemical nor the physical resistance reduction agents were conducive to protection galvanized steel in red soil environment.By simulating soil corrosion accelerating test, the influence of soil moisture and ambient temperature on galvanized steel and Q235 carbon steel corrosion behavior in the red soil was investigated. The results revealed that temperature has much effect on the composition of corrosion product. It also affected the corrosion rate and the corrosion degree: in the same humidity environment, the higher the temperature resulted in severe corrosion. The humidity affected the corrosion form of metal: in the soil with 10% and 20% moisture content, the samples are localized corrosion; samples were uniform corrosion in 30% aqueous system. Samples in the soil with 10% moisture content corrosion was expanded horizontally, the corrosion rate and corrosion degree were smaller than the original soil. Samples in 20% aqueous system expanded to the horizontal and vertical, the corrosion rate was larger than the original soil.The electrochemical behavior of galvanized steel and Q235 steel was studied in the simulated soil solution at different pH value after the sample immersed in simulated soil solution. The results showed that with pH value decreasing, the mass loss of sample increased gradually, and the corrosion rate increased. The pH value of solution had influence on the corrosion products of galvanized steel. With the pH decreasing, the corrosion current increased, and the corrosion became easily. The corrosion behavior of galvanized steel in simulation solution was controlled by a complex reaction that H+ participated in. The corrosion of Q235 steel in simulated soil solution was controlled by electrochemical activation.